Excalibur DBX Manual
Remote Digital
Line Unit
P/N 576051 Rev 1 b
Digital Voice Corporation. All rights reserved.
13700 Hutton Drive u Farmers Branch, TX 75234-9005 u 800.777.8329 or 972.888.6300 u FAX 972.888.6380
Contents
1Introduction - - - - - - - - - - - - - - - - - - - - 2Description
1.1
General - - - - - - - - - - - - - - - - - 1
1.2
System Application - - - - - - - - 1
1
- - - - - - - - - - - - - - - - - - - - - 1
2.1
Remote Digital Line Cell - - - - - 1
2.2
Remote Digital Line Unit - - - - - 2
2.3
RDLC PWBA Functions - - - - - 2
2.4
RDLU PWBA Functions - - - - - 5
2.5
Fiber Optic Cable Advantages 5
3Technical Characteristics
- - - - - - - - - - - - - - 6
3.1
Power Requirements - - - - - - - 6
3.2
Functional Characteristics - - - 7
3.3
Transmission Medium - - - - - - 8
3.4
Physical Characteristics - - - - - 8
3.5
Environmental Requirements - 8
4Equipment Installation Considerations
4.1
9
RDLU Location - - - - - - - - - - - 9
5Fiber Optic Cable - - - - - - - - - - - - - - - - - -11
5.1
General - - - - - - - - - - - - - - - - - 11
5.2
Outdoor Cable Requirements - 11
5.3
Environmental Considerations 12
5.4
Splicing - - - - - - - - - - - - - - - - - 12
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Remote Digital Line Unit, P/N 576051 Rev 1 b
5.5
Installation - - - - - - - - - - - - - - - 12
5.6
Testing - - - - - - - - - - - - - - - - - 13
6RDLC Installation and Connections - - - - - - - - - 14
6.1
General - - - - - - - - - - - - - - - - - 14
6.2
RDLC Demarcation Box Installation14
7RDLU Installation and Connections - - - - - - - - - 18
7.1
General - - - - - - - - - - - - - - - - - 18
7.2
Installation - - - - - - - - - - - - - - - 18
8.1
General- - - - - - - - - - - - - - - - - - 26
8.2
Remote Digital Line - - - - - - - - 26
8.3
Apply Power - - - - - - - - - - - - - - 26
8.4
Fiber Optic Cable Test - - - - - - 27
8.5
Optional Testing - - - - - - - - - - - 32
8Testing 26
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Remote Digital Line Unit, P/N 576051 Rev 1 b
Figures
FIGURE 1.
RDLU Equipment Block Diagram - - - - - - -3
FIGURE 2.
RDLU Equipment Configuration - - - - - - - -4
FIGURE 3.
Single/Double RDLU Floor Plan - - - - - - - -10
FIGURE 4.
RDLC PWBA Arrangement - - - - - - - - - - -16
FIGURE 5.
RDLC Backplane Cable Connections - - - - -17
FIGURE 6.
Fiber Optic Cable Connections - - - - - - - - -21
FIGURE 7.
Single RDLU Rack Interconnecting Wiring -24
FIGURE 8.
Double RDLU Rack Interconnecting Wiring 25
FIGURE 9.
RDLU PWBA Arrangement - - - - - - - - - - -29
FIGURE 10. RDLU Backplane Cable Connections - - - - -30
FIGURE 11. RDLC Loopback - - - - - - - - - - - - - - - - - - -31
FIGURE 12. RDLU PWBA Arrangement - - - - - - - - - - -31
FIGURE 13. RTX and RLC PWBA Component Locations34
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Remote Digital Line Unit, P/N 576051 Rev 1 b
Tables
TABLE 1.
RDLU Distribution Panel Controls - - - - - - -22
TABLE 2.
RDLC and RDLU PWBA Controls
and Indicators - - - - - - - - - - - - - - - - - - - - -35
TABLE 3.
RDLU Operational Checklist - - - - - - - - - - -37
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Remote Digital Line Unit, P/N 576051 Rev 1 b
SECTION
1
1
Introduction
Introduction
1.1 General
The RDLU is a self-contained digital/analog line cell that can be
located up to 6.2 miles from the controlling telephone system.
Longer distances beyond 10 Km are available as special order
items. (Contact customer service with specific requirements for
evaluation.)
The RDLU comes equipped with its own batteries and battery
charger which protects service in case of power failure. An
RDLU can be equipped to service up to 384 ports. An industry
standard fiber optic cable is used to connect the RDLU to the
controlling DBX. Two fiber optic conductors are required for
every 96 ports on an RDLU.
1.2 System
Application
2
The primary purpose of an RDLU is to extend the distance that
digital/analog voice telephones and/or data stations can be
located from a DBX. Without an RDLU, the maximum wire
length distance a digital voice telephone and/or data interface
station can be located from a DBX is 3900 feet (0.74 miles).
Description
2.1 Remote Digital
Line Cell
The Remote Digital Line Cell (RDLC) is a one-half cell wide
backplane and interfaces to an RDLU. The RDLU is a onequarter cell wide backplane. Each RDLC can be equipped to
service up to 96 ports. A second RDLC can be installed in a DBX
cabinet when more ports are required. The RDLC power
supplies can be mounted on either the left or right side of the cell
and near the outside edge of the DBX cabinet. RDLC transceiver
printed wiring board assemblies are selected for fiber optic cable
lengths of five or ten Km.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
2
Description
2.2 Remote Digital
Line Unit
An RDLU is available in two configurations. A single RDLU
cabinet can be equipped to service up to 192 ports and a double
RDLU cabinet can be equipped to service up to 384 ports. A
double RDLU occupies the same amount of space as a single
RDLU. A double RDLU is equipped with a second RDLU
enclosure, a second set of batteries, and larger capacity battery
charger. The RDLU is equipped with maintenance-free,
rechargeable, sealed batteries that can be charged and discharged
in a small room. Variable speed fans are used to control heat
inside the cabinet. A ring generator is provided for analog line
cards, if equipped.
2.3 RDLC PWBA
Functions
The remote digital/analog line cell uses four types of Printed
Wiring Board Assemblies (PWBA).
The following describes basic functions of the PWBAs:
A.
The Digital Port Controller (DPC) PWBA has a
microprocessor that serves as an intelligent interface to the
DBX CPU. A remote translator PWBA provides real time
control for its associated 48 ports.
B.
Translator (RTL) PWBA performs interface functions
between the digital port controller and the DML-24
channels.
C.
Remote Link Controller (RLC) PWBA initiates and
monitors synchronization between the RDLC and RDLU.
D.
The Remote Transceiver (RTX) PWBA accomplishes the
following functions:
1. The RTX receives incoming data from a fiber optic
cable and demultiplexes the data.
2. It multiplexes outgoing data and transmits it onto a fiber
optic cable.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
2
FIGURE 1.
Description
RDLU Equipment Block Diagram
3
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
FIGURE 2.
2
Description
RDLU Equipment Configuration
Ring
Generator
Ring Generator
RDLU # 2
RDLU
RDLU # 1
MANUAL
OVERRIDE
NORMAL
TEST
NEG.
TEST
O
F
F
O
F
F
MANUAL
OVERRIDE
NORMAL
TEST
LOAD
CONNECTED
POS.
TEST
LOW VOLTAGE DISCONNECT
ON
O
F
F
AC INPUT
OFF
POWER ON
EQUALIZE
R.F.A.
H.V.A.
L.V.A.
NEG.
TEST
EQ FLOAT
ADJ ADJ
EQ
FLOAT
O
F
F
-
TP1
TP2
CAUTION
Single RDLU
Installation
LOW VOLTAGE DISCONNECT
ON
AC INPUT
OFF
+
CAUTION
LOAD
CONNECTED
POS.
TEST
POWER ON
EQUALIZE
R.F.A.
H.V.A.
L.V.A.
EQ FLOAT
ADJ ADJ
EQ
FLOAT
+
-
TP1
TP2
CAUTION
CAUTION
Double RDLU
Installation
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
2
Description
3. The RTX monitors parity on incoming data and inserts
parity bits in outgoing data.
4. The RTX prioritizes requests.
5. The RTX also monitors loopback operations.
2.4 RDLU PWBA
Functions
The remote digital line unit uses four types of Printed Wiring
Board Assemblies (PWBA).
The following describes basic functions of the PWBA:
2.5 Fiber Optic
Cable
Advantages
A.
The Remote Link Controller (RLC) PWBA functions are the
same as described for the RDLC in section 2.3 C.
B.
The Remote Transceiver (RTX) PWBA functions are the
same as described in section 2.3 D.
C.
The Digital Line Card (DLC) PWBA performs interface
functions between eight station multiplexers and a DML-24
channel from the remote transceiver PWBA. Each station
multiplexer services three digital voice/data stations.
D.
The analog line card PWBA performs interface functions
between 24 analog line circuits and a DML-24 channel from
the remote transceiver PWBA.
Fiber optic cable was selected as a conductor for the RDLU
because of the following advantages it offers over a metallic
conductor.
A.
An RDLU can service 96 digital or analog stations with a
single pair of fiber optic conductors.
B.
A fiber optic cable is nonmetallic and will not pick up or emit
radio frequencies and electromagnetic interfaces, thus
eliminating interference caused by closely located lightning
and high voltage equipment.
C.
Electrical power surges are not transmitted to fiber optic
cables by lightning and accidental contact with power lines.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
3
Technical Characteristics
An RDLU and DBX are better protected from damages by
these sources.
3
D.
Sparks are not generated by broken fiber optic cables. Thus
eliminating possible hazards from a fire, explosion, or
electrical shock. This feature makes the fiber optic cable a
safer alternative. A fiber optic cable is especially suitable for
use in hazardous, flammable, and explosive environments
such as petrochemical and mining operations.
E.
Increased security is provided with a fiber optic cable
because electromagnetic eavesdropping devices are rendered
ineffective.
F.
There are no electrical grounding or shorting problems when
using a fiber optic cable. Ground loops are completely
eliminated.
G.
Fiber optic cables are much lighter than comparable coaxial
cables. Reduced weight can make installations in crowded
ducts easier to accomplish.
H.
Fiber optic cables use standard connectors (ST) along with
the link transceivers.
Technical Characteristics
3.1 Power
Requirements
The power requirements for an RDLU are as follows:
A.
AC power circuit:
•
•
•
Dedicated, non-switching circuit.
15 amps for a single RDLU
20 amps for a double RDLU
B.
AC power Connector:
C.
A standard 3-prong AC power connector and receptacle is
provided.
D.
AC voltage:
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
3
Technical Characteristics
•
E.
AC current:
•
•
3.2 Functional
Characteristics
8 amps maximum and 2 amps nominal for a single RDLU
14 amps maximum and 4 amps nominal for a double RDLU
The functional characteristics of an RDLU are as follows:
•
•
•
A.
B.
-54.0 to 54.5 VDC
Low voltage disconnect for batteries:
•
H.
-48 VDC
Battery charger output voltage:
•
G.
4 hours
Battery voltage:
•
F.
Less than 1 in 100,000,000 (100 million)
Minimum hours of operation on battery back-up:
•
E.
64k bits per second
Bit error rate:
•
D.
96 per fiber optic cable pair (or loop)
Data rate per channel:
•
C.
Number of Ports:
up to 192 for a single RDLU
up to 384 for a double RDLU
Number of channels:
•
-46 VDC
Maximum -48 VDC current:
•
•
•
•
•
3.3 Transmission
Medium
120 VAC +/- 10 percent
8 amps for a single RDLU
16 amps for a double RDLU
Nominal -48 VDC Power:
60 watts for a single RDLU
120 watts for a double RDLU
The transmission mediums for an RDLU are as follows:
A.
Fiber Optic Cable:
7
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
•
•
•
•
3
Technical Characteristics
62.5/125 or 50/125 micron multimode
Five Km (3.1 miles) is the maximum distance with a 1300 nm
transmitter.
Two conductors are required for each 96 ports nm transmitter.
Two Km (1.2 miles) max distance with an 820 nm transmitter.
See Sections 5.3 and 5.4 for additional information.
Note: The actual distance transmitted will depend on the
signal loss (budget). Signal loss is determined by the fiber
loss and connector transmission losses. Distances greater
than 5 Km are possible. Contact DVC for special cases.
3.4 Physical
Characteristics
The physical characteristics of an RDLU are as follows:
3.5 Environmental
Requirements
The environmental requirements for an RDLU are as follows:
•
•
•
•
•
•
A.
Operating ambient temperature range:
•
•
B.
1500 BTU per hour
Operating relative humidity range:
•
E.
750 BTU per hour
Heat generated by a double RDLU:
•
D.
+32°F to +90°F
O°C to +32°C)
Heat generated by a single RDLU:
•
C.
Width: 21 inches (54 cm)
Depth: 24inches (61 cm)
Height: 6 feet (1.83 m)
Packaging: 19 inch Rack Mountable Components
Rack Capacity: 1 or 2 RDLU
Weight: single RDLU approximately 220 pounds (100 kg);
double RDLU approximately 390 pounds (177 kg)
20 percent to 90 percent non-condensing
Storage temperature range:
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
4
Equipment Installation Considerations
•
•
F.
Storage relative humidity range:
•
4
O°F to +140°F
-18°C to +60°C)
20 percent to 95 percent non-condensing
Equipment Installation Considerations
4.1 RDLU Location.
A double RDLU occupies the same amount of space as a single
RDLU. Both RDLUs use the same size racks. However, a double
RDLU rack contains additional equipment. Figure 3 illustrates
the floor plan requirements for a single and double RDLU. The
dimensions shown in this diagram are minimum values which
can be exceeded, but not decreased. When installing RDLUs in
very small rooms, an air vent in the bottom and top of the door
is recommended to maintain a desirable operating temperature.
9
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
FIGURE 3.
4
Equipment Installation Considerations
Single/Double RDLU Floor Plan
Note:
1. The area around an RDLU in this diagram must be kept
free of obstructions.
2. Either side of an RDLU can be mounted against a wall.
3. Rotate this diagram 180° to view an RDLU installation
on a left wall.
4. The customer shall provide a standard AC power receptacle within nine cable feet from the RDLU power supply. (See Section 3.1).
10
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
5
5
Fiber Optic Cable
Fiber Optic Cable
5.1 General
This section describes the fiber optic cable specifications to
perform properly with an RDLU. This document does not,
however, provide a step-by-step installation procedure for the
fiber optic cable. (Installation is dependent on the type of cable
installed and the equipment available to the installer.) Always
consult the fiber optic cable manufacturer for specific handling
and installation information. Plan to install an extra pair of fiber
optic cables if there is a possibility of upgrading a single RDLU
to a double RDLU. The installer usually furnishes the
demarcation box for splicing outdoor to indoor cable.
Specialized equipment, knowledge, and skills are required to
install a fiber optic cable. It may be necessary and/or
advantageous to subcontract the fiber optic cable installation to
an installer who is equipped to handle this work.
5.2 Outdoor Cable
Requirements
The RDLU requires an industry standard fiber optic cable.
A.
The fiber optic cable uses 62.5/125 or 50/125 micron glass
fibers.
B.
The fiber optic cable has loose buffer glass fibers that are
tightly secured and break easily when the cable is bent.
C.
The fiber optic cable uses Kevlar for strength members.
(Metal strength members are not recommended because they
are more susceptible to damage from lighting.)
A multiconductor cable should have two conductors to service
each 96 RDLU ports and have extra conductors to allow for
breakage and growth.
5.3 Environmental
Considerations
Environmental considerations determine the type of fiber optic
cable to install. The following are examples of factors to
consider:
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
5.4 Splicing
5
Fiber Optic Cable
A.
Direct burial installations require a heavy-duty covering.
B.
Aerial installations require a greater amount of tensile
strength.
C.
Rodent infested areas require an armor type of protection.
D.
Areas prone to chemical exposure require chemical resistant
material.
If a fiber optic cable length exceeds two kilometers, a splice is
usually necessary as two kilometers is currently the maximum
reel length for most industry standard cable. For permanent
burial applications, a secure fusion splice is recommended. This
method is comparatively expensive. Therefore, a high quality,
inexpensive permanent splice may be used. This type of
technology is rapidly improving, thus the latest splicing
techniques should be investigated before a method is selected. If
the cable splice can be located in an accessible area, a
disconnectable splice and enclosure can be used.
5.5 Installation.
Caution: Special equipment, knowledge, and skills are
required to properly install a fiber optic cable. This
installation should only be performed by a qualified
installer.
A.
The following precautions apply to fiber optic cable
installation.
1. Have the DVC installation representative approve the
outdoor fiber optic cable before purchasing the cable.
2. Do not exceed the fiber optic cable loss budget supplied
by the DVC installation representative.
3. Install the fiber optic cable in a utility duct or an interduct for added protection.
4. Bury the cable sufficiently if an area is subjected to digging.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
5
Fiber Optic Cable
5. Observe the restraints for bending, twisting, and pulling
the cable during installation.
6. Exercise care to avoid damaging existing utilities when
digging in easement areas.
7. Perform an attenuation test on a reel of fiber optic cable
before it is installed to ensure that it was not damaged
during the shipping and handling process.
8. Perform an attenuation test after the fiber optic cable is
installed. If damage occurs, a record of the individual
fiber conductors’ loss must be presented to the DVC
installation representative.
B. Dress and number the ends of the fiber optic cable with a
breakout kit. Belden Breakout kit number 601343-033, or
another equivalent kit, may be used for two to twelve
conductor pairs.
5.6 Testing
C.
Place the ends of the fiber optic cable in a demarcation box
where the outdoor cable is connected to the indoor cable. A
demarcation box is supplied by the cable installer.
D.
Underwriter Laboratory (UL) requirements recommend and
sometimes require plenum indoor cable.
Warning: Avoid direct viewing of a fiber optic cable
connected to a light source transmitter. These transmitters
produce invisible light waves that can cause permanent
damage to the eye.
Test the one to two kilometer cable with an 820 nanometer light
source and test the five to ten kilometer cable with a 1300
nanometer light source. The maximum amount of attenuation
from one demarcation box to the other must be within the loss
budget and within acceptance cable and splice specifications. A
record of the attenuation level for each fiber conductor should be
presented to the DVC installation representative.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
6
6
RDLC INSTALLATION AND CONNECTIONS
RDLC INSTALLATION AND CONNECTIONS
6.1 General.
If a Remote Digital Line Cell (RDLC) is ordered with a DBX,
the DBX will normally arrive with the RDLC preinstalled. If an
RDLU is ordered after the applicable DBX is shipped, the RDLC
must be installed at the site. Instructions for an RDLC
installation are provided in section 576029, System Expansion
and Feature Implementation. Printed Wiring Board Assembly
(PWBA) locations for the RDLC are displayed in Figure 4 and
cable connections to the RDLC backplane are displayed in
Figure 5. These illustrations show an RDLC for a double RDLU.
If a single RDLU is used, the PWBA will usually be located in
cell positions 1 through 50, in order to minimize the length of the
power bus connections.
6.2 RDLC
Demarcation
Box Installation
Warning: Avoid direct viewing of a fiber optic cable
connected to a light source transmitter. These transmitters
produce invisible light waves that can cause permanent
damage to the eye.
A.
A demarcation box is used to connect the outdoor fiber optic
cable to the indoor fiber optic cable (Figure 6). An indoor
fiber optic cable is provided to connect the RDLC to its
demarcation box. Install a demarcation box on a switch room
wall that is convenient to the location where the outdoor fiber
optic cable will enter the switch room.
Warning: The indoor fiber optic cable is sensitive to
mechanical stresses such as compressing, stretching, and
bending. Install with care and do not crush or secure tightly
with wire ties. Do not lay other heavy cables on top of a fiber
optic cable.
B.
Route the indoor fiber optic cable from the RDLC backplane
fiber optic connectors to the demarcation box (See Figure 6).
14
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
6
RDLC INSTALLATION AND CONNECTIONS
Coil any excess cable in the cable tray, ceiling, or if space
permits, in the demarcation box.
C.
Ensure the DBX is operating properly and all remote digital/
analog line cell PWBA are installed correctly.
15
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
FIGURE 4.
6
RDLC INSTALLATION AND CONNECTIONS
RDLC PWBA Arrangement
Package contains 816414 and 816415
Each package contains boards and
interconnecting flat ribbon cable
and 6 Db attentuator spacers.
- 2 km package assembly
P/N 816427-701 RDLC
- 5 km package assembly
P/N 816427-702 RDLC
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
6
FIGURE 5.
RDLC INSTALLATION AND CONNECTIONS
RDLC Backplane Cable Connections
Fiber optic connectors
and optional cable
17
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
7
7
RDLU Installation and Connections
RDLU Installation and Connections
7.1 General
Inspect all equipment for shipping damage, bent connector pins,
and other visible damage. Verify that all items listed on the bill
of materials were received. Ensure that all items necessary to
complete the installation were received.
7.2 Installation
Warning: Avoid direct viewing of a fiber optic cable
connected to a light source transmitter. These transmitters
produce invisible light waves that can cause permanent
damage to the eye.
A.
A customer-supplied standard, single outlet AC power
receptacle must be installed within nine cable feet from the
RDLU power supply as noted in Figure 3.
B.
A sturdy floor is required to support the RDLU. Ensure there
is adequate space around the RDLU to provide access for
servicing. Position the RDLU for installation as shown in
Figure 3.
C.
Place circuit breakers CB1 and CB2 on the distribution panel
in the OFF positions (Figure 2).
D.
Place the power supply AC POWER and DC POWER circuit
breakers in the OFF positions (see Table 2).
E.
Place the low voltage disconnect panel toggle switch in its
NORMAL position (see Table 1).
Warning: Use extreme care when installing batteries in an
RDLU. Short circuits and incorrect wire connections
discharge large amounts of current and can cause injury and
equipment damage.
F.
Install the batteries in the RDLU rack as shown in Figures 7
and 8. Refer to Figure 7 for a single RDLU or Figure 8 for a
double RDLU. After the batteries are installed, check for a
minimum of -48 VDC across their series connection(s).
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
7
RDLU Installation and Connections
G.
Connect the power supply to AC power and connect a
voltmeter to its front panel OUTPUT VOLTAGE test points.
Turn on the power supply AC POWER and DC POWER
circuit breakers. Set its output voltage from -54.0 to -54.5
VDC. The power supply should be charging the RDLU
batteries.
H.
Install the distributing frame(s) on a wall that is convenient
to the RDLU and the interconnecting station wiring.
I.
Install the station multiplexers, digital voice telephones, and
data interface instruments (if applicable) in accordance with
the instructions provided in section 576015 Digital Voice/
Data Station Instruments Installation and Maintenance.
J.
A demarcation box is used to connect the outdoor fiber optic
cable to the indoor fiber optic cable. An indoor fiber optic
cable is provided to connect the RDLU with its demarcation
box. Install a demarcation box on a wall that is convenient to
the location where the outdoor fiber optic cable enters the
room.
Warning: The indoor fiber optic cable is sensitive to
mechanical stresses such as compressing, stretching, and
bending. Install with care and do not crush or secure tightly
with wire ties. Do not lay other heavy cables on top of a fiber
optic cable.
K.
Route the indoor fiber optic cable from the RDLU backplane
fiber optic connectors to the demarcation box. Coil any
excess cable in the cable tray or, if space permits, in the
demarcation box.
L.
Connect the indoor fiber optic cable located in the
demarcation box to the outdoor fiber optic cable. (Perform
this step if the outdoor fiber optic cable is installed.)
M.
Ensure circuit breakers CB1 and CB2 on the distribution
panel are in the OFF positions (see Table 1). CB1 supplies
19
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
7
RDLU Installation and Connections
the power for the boards and CB2 supplies the power for a
ring generator, if equipped for analog phones.
N.
If installing a double RDLU, perform the following steps on
the lower RDLU PWBA enclosure (RDLU #1):
1. Remove the screws securing the front cover to the
RDLU PWBA enclosure and open the front cover.
2. Unplug all printed wiring board assemblies in the
RDLU PWBA enclosure, except the power supply, and
pull them out approximately two inches from their
inserted positions. Do not remove the PWBA from their
RDLU enclosure slots.
3. Check the battery voltage for -54.0 to -54.5 VDC before
continuing with this procedure. Check the meter.
4. Place circuit breaker CB1 on the distribution panel in
the ON position.
5. Verify that the green lamp on the front of the PWBA
enclosure DC power supply illuminates.
• Verify illumination of the green LEDs on the back
of the RDLU PWBA enclosure backplane for the
following voltages:
• +5.00 Vdc
• -5.00 Vdc
• -48 Vdc
6. Place circuit breaker CB1 on the distribution panel in
the OFF position.
7. Insert all printed wiring board assemblies in the RDLU
PWBA enclosure backplane (Figure 9).
Note: If the backplane connectors do not align with the
PWBA connectors, loosen the backplane mounting screws to
allow backplane movement. Insert all PWBA in the
backplane. Retighten the backplane mounting screws.
8. Close and secure the RDLU enclosure front cover.
Ensure that the fans are rotating.
9. Place circuit breaker CB1 on the distribution panel in its
ON position.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
7
RDLU Installation and Connections
10. If installing a double RDLU, repeat steps 2 through 11
on the upper RDLU PWBA enclosure (RDLU #2), substituting circuit breaker CB2 on the distribution panel
for CB1.
11. After installation is complete, bolt the RDLU cabinet to
the floor.
FIGURE 6.
Fiber Optic Cable Connections
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
RDLU Installation and Connections
RDLU Distribution Panel Controls
TABLE 1.
Step
7
Control
Type
Function
1
CB1
Circuit
Breaker
Connects RDLU enclosure number 1 (lower
position) to battery power.
2
CB2
Circuit
Breaker
Connects RDLU enclosure number 2 (lower
position) to battery power.
3
AC Power
Circuit
Breaker
Supplies 117 VAC input power to the power supply.
4
DC Power
Circuit
Breaker
Supplies DC power to the output connector and
terminal blocks.
5
Load
Distribution
Fuse Holder
Not used in the RDLU application. Fuses can be
inserted in this holder allowing fused AC power to
be distributed from terminal blocks on the back of
the power supply.
6
AC Power On Green Light
Illuminated while 117 VAC input power is
operating the power supply.
7
HV Shutdown Red Light
Illuminates when the DC output voltage is
automatically turned off, after exceeding -60 VDC.
8
Low Current
Red Light
Illuminated when the output current is less than 0.06
amps.
9
Output
Voltage
Test Points
+ and - test provide access to the DC output voltage
with a voltmeter or other test equipment.
10
Output
Voltage
Adjust
Slot Screw
Adjusts the maximum value of the DC output
voltage.
11
Manual
Override
Toggle Switch When placed in the MANUAL OVERRIDE
position, the RDLUs remain connected to the
batteries regardless of battery voltage.
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Remote Digital Line Unit, P/N 576051 Rev 1b
7
SECTION
RDLU Installation and Connections
RDLU Distribution Panel Controls (Continued)
TABLE 1.
Step
Control
Type
Function
Normal
Toggle Switch In the NORMAL position, the RDLUs are
connected to the batteries while the battery voltage
is greater than -46 VDC. The RDLUs are
automatically disconnected if the battery voltage
drops below -46 VDC.
Test
Toggle Switch In the TEST position, a low battery voltage
condition is simulated and the RDLUs should
automatically disconnect from the batteries.
12
Load
Connected
Green Light
Illuminates while the RDLUs are connected to the
batteries.
13
NEG Test
Test Point
Provides access to the negative side of the battery
voltage with a voltmeter or other test instrument.
14
POS Test
Test Point
Provides access to the positive side of the battery
voltage with a voltmeter or other test instrument.
15
Fuse
3 AG 1 amp
Provides over current protection for the panels
internal circuitry. The RDLUs are automatically
disconnected from the batteries if the panels internal
circuitry fails and/or this fuse opens. If the panels
circuitry fails, the RDLUs can be manually
reconnected to the batteries without low voltage
disconnect protection by placing the toggle switch in
the MANUAL OVERRIDE position.
23
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
FIGURE 7.
7
RDLU Installation and Connections
Single RDLU Rack Interconnecting Wiring
Note:
1. The building ground
can be connected
here if the 120 VAC
safety ground is not
available at the
power receptacle.
2. The power supply is
equipped with a
nine-foot AC power
cord. Connect this
cord to a dedicated nonswitching 120 VAC 15
amp circuit.
DO NOT
CONNECT THE
BUILDING
GROUND TO THE
RDLU.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
7
FIGURE 8.
RDLU Installation and Connections
Double RDLU Rack Interconnecting Wiring
Note:
1. The building ground can be connected here if the 120 VAC
safety ground is not available
at the power receptacle.
2. The power supply is equipped
with a nine-foot AC power
cord. Connect this cord to a
dedicated nonswitching 120
VAC 15 amp circuit.
DO NOT CONNECT THE
BUILDING GROUND TO THE
RDLU.
25
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8
8
Testing
Testing
8.1 General
The Remote Digital/Analog Line Cell and Remote Digital/
Analog Line Unit uses identical PWBA cell power supplies but
different remote transceiver PWBA and remote port controller
PWBA. The RDLC uses 816414 (RLC) and 816415 (RTX). The
RDLU uses 770079 (RLC) and 770080 (RTX). Table 2 describes
the controls and indicators that are common to both the remote
digital line cell and the remote digital line unit.
8.2 Remote Digital
Line
A fiber optic meter is required for reading light levels at the
transmitter and receiving ends of both fibers. The meter must be
capable of measuring 820 nm or 1300 nm depending upon the
short or long transceivers. The Laser Precision AM-3500 power
meter with ST style connector interface or a standard voltmeter
are recommended.
Perform the following test procedure when installing the Remote
Digital Line equipment:
1. Apply Power
•
•
RDLC
RDLU
2. Check fiber optic cable attenuation light levels.
3. Optional Testing
•
•
8.3 Apply Power
RDLC Loopback Test
RDLU Loopback Test
Use the following procedures to test the RDLC (switch side):
RDLC (Switch Side)
1. Insert all boards into the RDLC beginning with the
power supply. Verify the switches on the remote controller at both ends of the link are set to the following normal positions:
26
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8
Testing
•
Push in the lower portion of both rocker switches S3
and S4.
• Place the S2 loopback toggle switch in the UP position.
2. The green lamp on the front of the card edge power supply must illuminate.
3. Using a voltmeter verify the +5 volts is within range +/0.25 volts. Apply probes to capacitor C5 (See Figure 12)
on the RLC board (remote link controller). The lower
lead is the positive (+) side. If the power is not within
tolerance, replace the power supply.
Use the following procedures to test the RDLU (Remote End):
1. Turn the CB1 and CB2 and the AC and DC circuit
breakers circuit breakers OFF.
2. Turn the AC and DC circuit breakers ON. Check the
output voltage for -54.0 to -54.5 VDC across the batteries. Adjust the voltage, if necessary, by the adjustment
on the front panel of the power supply.
3. Turn CB1 to ON position. This will send DC power to
the RDLU enclosure box. If a second RDLU is
equipped, turn CB2 ON. Perform check as in steps 2 and
3 above.
8.4 Test Fiber Optic
Cable
Attenuation
Light Levels
Use the following procedures to test the fiber optic cable
attenuation light levels.
1. Verify the fiber optic transmitter on each end is transmitting at an acceptable power level. Use a fiber optic
meter to connect to the transmitter daughter card of the
transceiver PWBA. The transmitter is the lower daughter board.
• An acceptable level is greater than -17 dBm for 820
or 1300 nm.
2. Connect the fiber optic meter at the receive end of the
cable.
• An acceptable level is (820nm)-29.6 to -36.2 dBm.
• An acceptable level is (1300nm)-11.3 to -36.8 dBm.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8
Testing
An attenuator spacer (or in-line attenuator) should be used to
reduce the power level if the level exceeds the upper limit. The
more negative the dBm, the weaker the signal.
Note: The 1300 nm receiver will self-adjust to an extent and
should not need an attenuator. Try connecting the link and
test for misframes (CR3) and or parity errors (CR2). See
Figure 12. If there are no errors, the link is acceptable.
3. If an attenuator is required a 6dBm at 820 nm or 11dBm
at 1300 nm spacer is included with the boards. The same
spacer has different attenuator levels for different frequencies (820 or 1300 nm). The attenuator spacer
always goes at the transmitter end of the cable.
Call customer service in the event more attenuation is necessary
for either a 10 or 15 dBm in-line attenuator. One in-line
attenuator is used for each strand. Two are required for both
strands.
4. Connect all fiber cables once proper attenuation levels
are achieved. The lamps on the link controller board
should indicate the following:
• CR3 misframe lamp extinguishes in 3-10 seconds.
• CR1 green heartbeat lamp blinks.
• CR4 loopback lamp is OFF.
• CR10 loss of clock lock lamp should be OFF (n/a at
RDLU side).
• CR2 parity lamp should be OFF.
If the link does not operate properly verify that the attenuation
levels are within acceptable limits. A loopback test may isolate
the trouble.
This concludes the hardware installation test for the link.
Proceed to system testing by making phone calls.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8
FIGURE 9.
Testing
RDLU PWBA Arrangement
Note: See section 576015 “Digital Voice/Data Station Instruments
Installation and Maintenance Practice” for a listing of connections to the
multiplexors and associated stations.
Note: Each package contains P/N 770079 and P/N 770080 boards and
interconnecting flat ribbon cable and 6 Db attenuator spacer.
•
•
2 Km Package Assembly P/N 770427-703
5 Km Package Assembly P/N 770427-701
29
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
FIGURE 10.
8
Testing
RDLU Backplane Cable Connections
Note: See Section 576015 “Digital Voice/Data Station Instruments Installation
and Maintenance Practice” for a listing of connections to the multiplexors and
associated stations.
J-3, J-4, J-6, J-8 NOT USED FOR RDLU INSTALLATION
30
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8
FIGURE 11.
Testing
RDLC Loopback
Note: Tests the RDLC only, less the fiber transensors.
FIGURE 12.
RDLU PWBA Arrangement
Note: Remote digital line unit loopback test checks the RDLU transmitter and
receiver, the two fiber optic conductors, and the RDLC transmitter and receiver.
The fiber optic cable must be connected.
31
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8.5 Optional
Testing
8
Testing
Use the following procedures for optional testing requirements.
1. RDLC loopback testing.
This test loopbacks the digital output before the optical
transceivers. It is designed to test the digital signal to and from
the daughter fiber cards but does not test the daughter cards. To
test the daughter cards requires a loopback fiber cable with
acceptable attenuation to not overdrive the receiver.
Note: Loopback operation will cause all service channels to
be out of service.
2. Place the RTX PWBA in the loopback mode by setting
switch S2 in the DOWN position.
3. Observe the lamps:
• The CR3 misframe lamp should extinguish in 3 to
10 seconds.
• The CR1 green heartbeat lamp should blink.
• The CR4 Loopback lamp should illuminate.
• Disregard any indications from the CR2 parity lamp.
If the test fails, suspect the RTX and/or the RLC board.
4. Go to normal mode by setting S2 in the UP position.
End RDLC loopback testing.
1. RDLU loopback testing.
Note: Loopback operation will cause all service channels to
be out of service.
2. Place the RTX PWBA in the loopback mode (Figure 11)
by setting switch S2 in the DOWN position.
3. Observe the lamps:
• The CR3 misframe lamp should extinguish in 3 to
10 seconds.
• The CR1 green heartbeat lamp should blink.
• The CR4 loopback lamp should illuminate.
• Disregard any indications from the CR2 parity lamp.
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Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8
Testing
If the test fails suspect the fiber cable or fiber tranceivers. If this
test passes but the RDLU does not work properly out of
loopback, suspect the RTX and/or the RLC board(s).
End RDLU loopback testing.
33
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
FIGURE 13.
8
Testing
RTX and RLC PWBA Component Locations
34
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8
TABLE 2.
Testing
RDLC and RDLU PWBA Controls and Indicators
Control or
Indicator
Type
Function
System Clock (CR10)
Red LED
Lights when the RDLC loses phase locking
to the DBX system clock. This indicator is
inactive when its PWBA is installed in an
RDLU.
Parity Error (CR2)
Red LED
Flashes when a frame with an even parity
error is received.
Heartbeat (CR1)
Green LED
Flashes when the micro CPU is executing.
Misframe (CR3)
Red LED
Lights when a loss of sync occurs on the
transmission link. All ports will be down
and purged during this time. Once the cause
of failure is removed, three to ten seconds
are needed to reestablish link
synchronization and restoration of ports.
Loopback (CR4)
Red LED
Lights when the PWBA is in a loopback test
mode.
Loopback (S2)
Toggle Switch 2-position UP is the normal position for this switch,
allowing a software command to initiate a
loopback test. DOWN position manually
places the PWBA in a loopback test mode
(see Figure 11).
CPU Reset (S1)
Push Button
35
Remote Digital Line Unit, P/N 576051 Rev 1b
Momentarily pressing this button purges all
calls, terminates existing operations, and
initiates the cold start sequence. A link reset
is also initiated causing the communications
link to go down and resynchronize.
SECTION
TABLE 2.
Control or
Indicator
8
Testing
RDLC and RDLU PWBA Controls and Indicators
Type
Function
Inject Parity Errors (right DIP Switch
side of S3)
The switch is inactive (normal position)
when the lower portion of its rocker is
pushed in. The active position injects parity
errors in the transmission link to check the
parity tester on the receiver circuit for an
error indication. It is active when the upper
portion of its rocker is pushed in.
DIP Switch
Loopback Disable
(left side of S3)
(Software and Hardware)
This switch prevents the PWBA from
entering the loopback test mode when the
upper portion of its rocker is pushed in. It
permits loopback testing on the PWBA
when the lower portion of its rocker switch
is pushed in (normal position). It is now in
the upper portion.
Expansion (S4)
This switch is provided for future
expansion.The lower portion of both
rockers are pushed in its normal position.
DIP Switch
36
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8
Testing
RDLU Operational Checklist
TABLE 3.
Date:
Performed by:
Place an X in the box when the task is complete.
Check all RDLU wires and cables for secure connections.
Check that the RDLU enclosure fan is circulating air.
Measure and record the battery voltage (see section 8.3).
-54.0 to -54.5 VDS measured value is:
Measure and record the power supply +5VDC output (see section 8.3).
+5.00 +/- -0.25 VDC measured value is:
Perform a loopback test and check for correct indications (see section 8.5).
Check all systems for correct positions (see section 8.3).
Check all lamps for correct indications (see section 8.4).
Measure and record the transmitter dBm power levels (see section 8.4).
-17 dBm minimum from a 1 to 2 km 820 nanometer transmitter measure value is:
-17 dBm minimum from a 2 to 5 km 1300 nanometer transmitter measured value is:
Measure and record the receiver dBm power level (see section 8.4). Measured value is
____________________ RDLU __________________ RDLC.
For 820 nm -29.6 dBm maximum to -36.2 dBm minimum.
For 1300 nm -11.3 dBm maximum to -36.8 dBm minimum.
37
Remote Digital Line Unit, P/N 576051 Rev 1b
SECTION
8
Testing
38
Remote Digital Line Unit, P/N 576051 Rev 1b