TIMUX
Flexible Line Multiplexer
System Description
P/N 762-50100D
March 1997
 1997 Teledata Communications Ltd. All rights reserved.
Teledata Communications Ltd. reserves the right to alter the equipment specifications and descriptions in this publication
without prior notice. No part of this publication shall be deemed to be part of any contract or warranty unless specifically
incorporated by reference into such contract or warranty.
The information contained herein is merely descriptive in nature, and does not constitute a binding offer for the sale of the
product described herein.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including
photocopying and recording, for any purpose without the express written permission of Teledata Communications Ltd.
File: \\venus\idg\docs\timux\referenc\base\sysdesc\50100d.doc saved 28/03/97 19:02
TABLE OF CONTENTS
LIST OF FIGURES....................................................................................................................iv
1.
INTRODUCTION .................................................................................................... 1-1
2.
SYSTEM OVERVIEW ............................................................................................ 2-1
2.1.
System Architecture ................................................................................. 2-1
2.2.
Interfaces .................................................................................................. 2-1
2.3.
System Features and Benefits................................................................... 2-1
2.3.1.
Flexible Topology ................................................................. 2-1
2.3.2.
Management Unit .................................................................. 2-2
2.3.3.
Modularity ............................................................................. 2-3
2.3.4.
Transparency to Network ...................................................... 2-3
2.3.5.
Line Testing........................................................................... 2-3
2.3.6.
Automatic Configuration....................................................... 2-3
2.3.7.
Metering Detection and Regeneration................................... 2-3
3.
SYSTEM COMPONENTS ...................................................................................... 3-1
3.1.
Basic System Structure............................................................................. 3-1
3.1.1.
CU and RU ............................................................................ 3-1
3.1.2.
Compact Cabinet ................................................................... 3-2
3.2.
Common Cards......................................................................................... 3-3
3.2.1.
ECPU and RCPU .................................................................. 3-3
3.2.2.
PSDC and PSRG/PSRG6...................................................... 3-4
3.3.
Optional Line Cards ................................................................................. 3-4
3.3.1.
POTS ..................................................................................... 3-4
3.3.2.
ISDN U Interface (2B1Q)...................................................... 3-4
3.3.3.
Polarity Reversal ................................................................... 3-4
3.3.4.
E&M Signaling...................................................................... 3-4
3.4.
Optional Trunk Cards............................................................................... 3-5
3.4.1.
HDSL Trunk Cards ............................................................... 3-5
3.4.2.
Optical Line Termination Card ............................................. 3-6
3.4.3.
2 Mbit/s G.703/6 Links ......................................................... 3-6
4.
ADMINISTRATION AND MANAGEMENT ........................................................ 4-1
4.1.
Management Unit (MU)........................................................................... 4-2
4.2.
Teledata Element Manager (TEM)........................................................... 4-2
4.3.
Menu Structure......................................................................................... 4-3
4.3.1.
Hardware Configuration........................................................ 4-3
4.3.2.
Performance Monitoring ....................................................... 4-5
4.3.3.
Setup...................................................................................... 4-5
4.3.4.
PCM and HDSL Loopback ................................................... 4-6
P/N 762-50100D
Page iii
Table Of Contents
4.3.5.
4.3.6.
4.3.7.
Fault Detection and Alarms ................................................... 4-6
Security .................................................................................. 4-6
Testing ................................................................................... 4-6
5.
SYSTEM SPECIFICATIONS .................................................................................. 5-1
6.
GLOSSARY.............................................................................................................. 6-1
LIST OF FIGURES
Figure 1-1:
Figure 2-2:
Figure 3-1:
Figure 3-2:
Figure 3-3:
Figure 3-4:
Figure 3-5:
Figure 4-1:
Figure 4-2:
Figure 4-3:
Figure 4-4:
Figure 4-5:
Figure 4-6:
Figure 4-7:
Page iv
TIMUX Applications .................................................................................. 1-2
Star Topology.............................................................................................. 2-2
TIMUX CU ................................................................................................. 3-1
CRTC1 and CRTC2.................................................................................... 3-2
CRTC1 - Open View .................................................................................. 3-3
HDSL Application ...................................................................................... 3-5
SDH Application......................................................................................... 3-6
Management Applications .......................................................................... 4-1
TEM Network Topology............................................................................. 4-2
TEM Network Map Display........................................................................ 4-3
Network Map Window ............................................................................... 4-4
Hardware Configuration Window............................................................... 4-4
HDSL Information Window ....................................................................... 4-5
Line Tests Window ..................................................................................... 4-8
P/N 762-50100D
1.
INTRODUCTION
To meet the challenges of today's telecommunications industry, telcos must
provide systems that are flexible and modular - systems that can be configured to
meet the market's changing needs without requiring extensive and expensive
changes in hardware or infrastructure. The TIMUX is Teledata's solution to these
challenges.
The TIMUX is a state-of-the-art access multiplexer that allows telephone
operating companies to increase the capacity of existing networks quickly and
economically, providing telephony, ISDN and data services to groups of
subscribers, such as:
• Business centers
• Industrial parks
• Residential buildings
• Universities
• Temporary sites
• Internet Service Providers (ISP)
The TIMUX is a multiplexing system which provides digital telephony and data
services to groups of 30 to 150 subscribers. The system is designed to comply
with European standards which include requirements for services, network
interfaces, safety and electromagnetic compatibility.
The development of the TIMUX has emphasized the particular needs of telcos,
providing the network planner and technicians with a flexible and modular system
combined with friendliness, reliability and easy-to-maintain qualities.
The system incorporates integral transmission cards for copper wires (PCM and
HDSL), fiber optics, digital radio and external SDH rings, to allow flexibility and
efficient utilization of existing infrastructures.
P/N 762-50100D
Page 1-1
1. Introduction
Figure 1-1:
TIMUX Applications
Business
Center
Urban
TIMUX
Rural
Industrial
Thanks to its advanced management software and enhanced line testing capability,
the TIMUX offers the operator incomparable means to manage, supervise and
maintain the system or a network of Teledata's systems.
Page 1-2
P/N 762-50100D
2.
SYSTEM OVERVIEW
2.1.
System Architecture
The system comprises two units, the Central Unit (CU) which is installed at the
exchange and the Remote Unit (RU) installed at the customers' premises. In the
basic Point-to-Point topology one CU serves a single RU, while in the Point-toMulti-Point (Star) topology, a single CU supports up to four RUs. One CU
supports up to 150 line interfaces to the exchange.
2.2.
Interfaces
TIMUX directly interfaces with copper wires (PCM and HDSL), fiber optics,
radio and external SDH equipment through integral cards. A mix of all types of
interfaces is feasible within the same CU.
One system can support POTS, Pay-Phones, ISDN U interface with 2B1Q line
code, 2W or 4W leased lines (with or without E&M signaling), high-speed
modems and fax service.
2.3.
System Features and Benefits
The TIMUX simplicity, modular design, and flexibility provide many functional
and financial benefits for telephone companies.
The various trunk interfaces are an integral part of the system, requiring no
additional external interfaces.
2.3.1.
Flexible Topology
The flexibility of the TIMUX allows the telephone company to configure a system
as a Point-to-Point system with one group of 30 to 150 subscribers, or as a Star
system with up to five groups of 30 subscribers, for a total of up to 150
subscribers. When using a fiber optic interface, the system can serve up to 120
subscribers through one to four RUs.
Groups of up to 60 subscribers can be served using the optimized TIMUX-60,
consisting of compact RU and power backup enclosures.
The multi-configuration feature and compact size of the CU saves the operating
company vital space and money.
P/N 762-50100D
Page 2-1
2. System Overview
The advantages of the Star configuration include:
• Cost reduction
• Space savings at the exchange
• Wiring savings at the exchange
• Smooth expandability to accommodate future growth by simply plugging in
new cards
• Easy, uniform management access, with one management card controlling all
RUs
• Simplified network topology
Figure 2-2:
Star Topology
RU
RU
LOCAL
EXCHANGE
CU
up to 150 LINES
RU
RU
MANAGEMENT UNIT
OR TEM
2.3.2.
Management Unit
The TIMUX is equipped with a user friendly, easy-to-operate Management Unit
(MU) software that runs on a PC. The MU enables operators to manage, maintain
and administrate operations including:
• System configuration reporting and control
• System alarm monitoring
• Customer activity monitoring and traffic statistics analysis
• Trunk and subscriber line testing
• Fault diagnostics.
The MU can be used to monitor the system from the exchange (the CU site) or
from any other location via dial-up modem.
Page 2-2
P/N 762-50100D
TIMUX Flexible Line Multiplexer System Description
2.3.3.
Modularity
TIMUX is a completely modular system, therefore its functionality can be
expanded or upgraded by simply adding or exchanging slide-in cards. System
design has put a major emphasis on compactness, as well as easy installation and
maintenance. All cards have front access connectors that enable direct wall
mounting of the RU cages. CU cages are standard 19” wide and 7U height
including a 1U interval for cables.
2.3.4.
Transparency to Network
The TIMUX is totally transparent to both the exchange and subscribers and
therefore does not limit network services provided to subscribers.
As a result, TIMUX supports CLASS and Flash operated services such as calling
line identification presentation (CLIP), call waiting and call diversion.
2.3.5.
Line Testing
The TIMUX includes enhanced line testing capabilities. This feature, together
with telcos’ approach to provide high-quality services, enables supervisors to test
subscriber lines remotely through the TIMUX saving the time and cost of testing
lines in the field.
The TIMUX RCPU card enables tests to be conducted on the subscriber lines
between the RU and the subscriber's equipment. The integral test head enables
tests for capacitance, noise, foreign AC and DC voltage, leakage, and voice
frequency.
2.3.6.
Automatic Configuration
TIMUX is completely self-configuring. The system recognizes the installation,
replacement, or removal of cards or entire RUs, configuring itself accordingly.
The system also tests itself periodically to ensure reliable operation and rapid
location of faults.
2.3.7.
Metering Detection and Regeneration
The TIMUX CU detects SPM (Subscriber Private Metering) and the TIMUX RU
regenerates the metering pulse (12/16 kHz with or without polarity reversal)
toward the subscriber line or to a pay phone.
P/N 762-50100D
Page 2-3
3.
SYSTEM COMPONENTS
3.1.
Basic System Structure
3.1.1.
CU and RU
The CU is connected to a local exchange. The exchange may be digital or
electromechanical (of the Strowger or the cross-bar type). The CU is installed in a
standard 19" rack at the exchange.
The RU unit is installed at, or near, the customers' premises. Installations may be
wall-mounted, housed in a compact and ruggedized enclosure, or a standard 19"
rack.
The RU and the CU are similiar in build. Each standard 19"-wide, 7U-high cage
accommodates up to 20 slide-in line interface cards. This includes 15 line
interface cards, one central processing unit, one power supply and three trunk
interface cards.
The basic system comprises one card cage, as depicted in Figure 3-1.
Figure 3-1:
P/N 762-50100D
TIMUX CU
Page 3-1
3. System Components
3.1.2.
Compact Cabinet
In addition to the standard 19” cage, a compact RU which supports up to 60
subscribers is also available. The compact RU comprises two mini-cabinets:
• CRTC1 - contains the RU cards
• CRTC2 - contains the power supply/battery charger and four back-up
batteries.
Both cabinets are self-supporting and can be hung on a wall or joined together to
form a single 19” unit.
The CRTC1 and CRTC2 are shown in Figure 3-2 and Figure 3-3.
Figure 3-2:
CRTC1 and CRTC2
Protected DC
Battery Cables
Output (0.5A)
Earthing
Lug
DC and Alarm
Cable
AC Mains
Power Cable
Battery 2
-48V
-12V
MAJOR
+12V
- 5V
TEST
+ 5V
OPER
COMM
EXT
MINOR
ON
REMOTE
MASTER
OFF
Battery 4
LINE
LINE
LINE
LINE
LINE
LINE
TRUNK
LI2M
RCPU
PSRG
Spare Fuses
Cards
CRTC1
Page 3-2
Rectifier/
Charger
CRTC2
P/N 762-50100D
TIMUX Flexible Line Multiplexer System Description
Figure 3-3:
3.2.
CRTC1 - Open View
Common Cards
Every TIMUX contains at least the following common cards:
• ECPU and RCPU
• PSDC and PSRG/PSRG6
3.2.1.
ECPU and RCPU
The ECPU card is part of the CU and contains the CU’s main CPU and alarm
panel.
The RCPU card is part of the RU and includes the RU’s main CPU and alarm
panel, along with additional circuitry for testing subscriber lines right up to the
customer’s equipment. These tests include voice path, leakage, capacitance, noise
and foreign AC and DC voltages.
Both the ECPU and RCPU can be accessed locally or remotely from the MU for
management, diagnostics and fault monitoring purposes.
P/N 762-50100D
Page 3-3
3. System Components
3.2.2.
PSDC and PSRG/PSRG6
The PSDC power supply card, installed in the CU, is fed by -48V nominal voltage
to provide ±5V and ±12V for the CU’s cards.
The PSRG card installed in the RU provide the same functionality as the PSDC
card installed in the CU and supply a ringing voltage to the subscriber lines.
PSRG6 is used in CRTC1 (RU for 60 subscribers).
3.3.
Optional Line Cards
These cards can be added selectively according to the services that the telephone
network operator wishes to supply.
3.3.1.
POTS
Each PLIC (CU Line Interface) and PLIR (RU Line Interface) card provides 10
POTS lines with 12/16 kHz metering per line.
3.3.2.
ISDN U Interface (2B1Q)
Each ULIC (CU U-Interface) and ULIC (RU U-Interface) card provides four
ISDN BA lines complying with ETSI ETR 080.
3.3.3.
Polarity Reversal
Each PLIC and RPIR (Reverse Polarity Interface - RU) card provides ten channels
for telephone lines requiring polarity reversal.
3.3.4.
E&M Signaling
Each 4W+E&M card provides 10 channels of 4W with E&M signaling. Three
levels of gain are field selectable through the MU, while the default values comply
with ITU-T Recommendation G.713:
• Rx level: -14 dBr
• Tx level: +4 dBr
2W+E&M card provides 10 channels of 2W with E&M signaling.
It is always possible to use 4W+E&M or 2W+E&M cards as line interfaces to 4W
or 2W analog modems.
Page 3-4
P/N 762-50100D
TIMUX Flexible Line Multiplexer System Description
3.4.
Optional Trunk Cards
Optional trunk cards can be added selectively according to the type of
transmission media between the CU and the RU.
3.4.1.
HDSL Trunk Cards
The TIMUX HDSL (High bit-rate Digital Subscriber Line) transmission cards
(HDS1, HDS2 and HDS2F) enable transportation of 2 Mbit/s streams between the
CU and RU over unconditioned copper pairs.
The HDS1 card supports 2 Mbit/s termination for use with 2 x 2W copper.
The HDS2 card supports two 2 Mbit/s terminations for use with 4 x 2W copper
(double that of the HDS1).
The HDS2F card provides the extra functionality of power feeding. This enables
the insertion of HDSL doublers into the HDSL link in order to extend ranges
between the CU and RU. The doubler is then powered by the HDS2F card. The
HDS2F can also be installed in the RU to provide powering to a second doubler.
With the aid of HDSL doubler units, the range between the exchange and
subscribers can be significantly extended using the existing unconditioned copper
pairs. An HDSL link may include up to two HDSL doubler units, thereby tripling
the range between the CU and RU.
Figure 3-4:
HDSL Application
LOCAL
EXCHANGE
CU
(up to 150 lines)
2x4W HDSL
Existing Copper Cable
RU
(60)
P/N 762-50100D
Page 3-5
3. System Components
3.4.2.
Optical Line Termination Card
The TIMUX offers an integral, direct-plug-in optical fiber interface card with
transmission capacity of four 2 Mbit/s signals. The OLTU enables the TIMUX CU
and RU to communicate over two single-mode optical fibers operating at
1310 nm.
The OLTU is an integral part of the TIMUX. Therefore, it saves the cost and
installation difficulties of external fiber optic interface equipment with additional
management overhead.
This optional card allows a single CU to serve up to 120 subscribers that are
connected to one to four RUs.
3.4.3.
2 Mbit/s G.703/6 Links
The LI2M card has two 2 Mbit/s G.703/6 interfaces to trunks linking the TIMUX
CU to the RU. Each channel multiplexes 30 lines so that one LI2M has the
capacity to serve 60 lines. LI2M tributaries may be connected to external
transmission bearers such as microwave radio or SDH equipment.
LI2M provides all standard E1 alarms complying with ITU-T recommendation
G.732.
An example of an SDH application is shown in Figure 3-5.
Figure 3-5:
SDH Application
RU (60)
RU (60)
RU (60)
CU
120 LINES
LOCAL
EXCHANGE
ADM
120x2W
4W G.703
RU (60)
ADM
SDH
ADM
RU (60)
120x2W
4W G.703
RU (60)
Page 3-6
ADM
RU (60)
P/N 762-50100D
4.
ADMINISTRATION AND MANAGEMENT
The TIMUX is accessible for system management and administration through a
standard PC, directly through a serial port or remotely through a dial-up modem.
The system management provides the operator with the following features:
• Network mapping
• System and line diagnostics
• System configuration
• System monitoring
• System security
Figure 4-1:
Management Applications
RU
Digital
PCM
RU
CU
TEM
RU
Remote MU
Connection
RU
PSTN
RU
RU
Digital
PCM
MU
RU
CU
RU
RU
MU
RU
Local MU Serial Connection
to CU or RU
50100d40.vsd
Operators can use one of two Windows-based management systems; the
Management Unit (MU) appropriate for a single TIMUX system, or the Teledata
Element Manager (TEM) which offers an integrated view of the entire network
consisting of hundreds of TIMUX systems as well as other Teledata products.
P/N 762-50100D
Page 4-1
4. Administration and Management
4.1.
Management Unit (MU)
The MU contains a sophisticated software application for managing, maintaining,
and testing the TIMUX. The unit is comprised of an IBM compatible PC with an

easy-to-use management software package running under the Microsoft
™
Windows operating system.
4.2.
Teledata Element Manager (TEM)
The Teledata Element Manager (TEM) is an optional centralized management tool
developed for all Teledata products according to ITU-M.3010 guidelines. The
TEM is capable of managing several hundred TIMUX systems in addition to other
Teledata products. The TEM, which runs on a PC, is a user friendly Windowsbased application that continuously collects system status information and saves it
in a database. The interface is similar to that of the MU, ensuring ease of operation
for users of both the MU and the TEM.
Figure 4-2:
TEM Network Topology
TEM - NETWORK TOPOLOGY
TEM
PSTN
TIMUX
Page 4-2
DCS-20E
CTLOOP
ERC
P/N 762-50100D
TIMUX Flexible Line Multiplexer System Description
Figure 4-3:
TEM Network Map Display
TEM - NETWORK MAP
4.3.
Menu Structure
The software is menu-driven, all menu options are selected using a standard
keyboard or mouse.
4.3.1.
Hardware Configuration
The system layout is graphically represented in a network map window. Figure 4-4
shows an example of a simple network map and its menu options.
The MU can also display the hardware configuration of each system unit,
including the type, software version and status of the various cards.
Figure 4-5 shows an example of the hardware configuration window. The user can
click on various areas of the screen (e.g. cards) to reveal additional information
about the selected item.
P/N 762-50100D
Page 4-3
4. Administration and Management
Page 4-4
Figure 4-4:
Network Map Window
Figure 4-5:
Hardware Configuration Window
P/N 762-50100D
TIMUX Flexible Line Multiplexer System Description
The hardware configuration information includes:
• Slot number
• Card name
• Status (card present or not, and matched or failed)
For each PCM or HDSL link, the following information is displayed:
• PCM
• Mode
• Status
Figure 4-6 shows an example of the HDSL information window.
Figure 4-6:
4.3.2.
HDSL Information Window
Performance Monitoring
Performance data such as subscriber loop testing, alarms and events are stored and
time-stamped. Any portion of the stored historical data may be displayed by
selecting the day, hour, or minute it was stored.
4.3.3.
Setup
The Setup menu enables the operator to configure the TIMUX. The configurable
parameters include:
• Passwords and privileges for the three user levels: operator, service and
supervisor
• System name
• System parameters (date, time, etc.)
• Threshold values against which the system compares test results
P/N 762-50100D
Page 4-5
4. Administration and Management
4.3.4.
PCM and HDSL Loopback
Two types of loopback are supported:
• Remote
• Local
For each PCM or HDSL link, the operator may set remote or local loopbacks for
testing and fault location.
4.3.5.
Fault Detection and Alarms
TIMUX provides a variety of alarm indicators. Dry contact relays are provided for
signaling major and minor alarms. Alarms are also indicated by LEDs and audible
signals both at the CU and the RU. Each card has at least two on-board LED
indicators – one green LED to indicate normal operation and one red LED to
indicate a fault.
The Alarms menu presents the operator with a list of the alarms that the system
logged. The list can be filtered to include only alarms of interest to the user, using
date, time and alarm type parameters.
The MU monitors PCM performance. For each PCM link the following
information is recorded:
• PCM number
• Fault type
• Time stamp
• Status
4.3.6.
Security
The MU’s security features prevent unauthorized persons from operating the
system and changing its data and parameters. Users are divided into three classes:
Operator, Service and Supervisor. Each class can access only the menus and
dialog boxes that are authorized for that class. Options that are not available to the
logged-in user are disabled and shown in gray.
4.3.7.
Testing
TIMUX includes comprehensive diagnostic and reporting tools for maintenance
and fault location. A special test head in the RCPU enables extensive line testing
upon request. In conjunction with the MU software, it allows maintenance center
operators or field technicians to select and initiate tests through the MU whenever
needed.
For each test, software-programmable default values (thresholds) may be set
through the MU. Each test has a test range and tolerance for the results. Test
Page 4-6
P/N 762-50100D
TIMUX Flexible Line Multiplexer System Description
results are indicated by LEDs on the front panels of CU and RU cards, and are
reported to the MU. The results of each test are stored, and the operator may
browse and check the results concurrently or at a later time.
Testing of subscriber lines, up to the customer premises equipment, is among the
most important testing functions. The following subscriber tests are supported:
• Capacitance test
• Foreign DC voltage
• Foreign AC voltage
• Leakage test
• Noise test
• VF test
Test results can be filtered to display only results of special interest to the
operator, such as screening by time intervals, type, line selections and results
(pass/fail).
4.3.7.1.
Capacitance Test
This test detects the capacitance between A and B, between A and GND and
between B and GND. The capacitance test detects if the line is disconnected or if a
telephone set is connected. The test does not cause the telephone set to ring and
tests telephone sets of all types.
4.3.7.2.
Foreign DC Voltage
This test detects a foreign DC voltage between -200 VDC and +200 VDC on the
A and B wires. The test result is acceptable if the detected DC voltage is between 5 VDC and +5 VDC, otherwise an alarm is indicated.
4.3.7.3.
Foreign AC Voltage
This test detects foreign AC voltage between 0 and 250 volts on the A and B
wires. The test result is acceptable if the detected AC voltage is between -5 VAC
and +5 VAC, otherwise an alarm is indicated.
4.3.7.4.
Leakage Test
This test detects leakage between the A and B wires. The test result is acceptable
if the detected resistance is below 200 kΩ; otherwise an alarm is indicated.
P/N 762-50100D
Page 4-7
4. Administration and Management
4.3.7.5.
Noise Test
This test detects noise between the A and B wires. The acceptable noise range is
between -60 and -30 dBm (accuracy ±6 dB at 600 Ω impedance), at a frequency
range of 300 - 4000 Hz.
4.3.7.6.
VF Test
This test checks the voice path from the line circuit, returning either a “pass” or
“fail” message.
Figure 4-7 shows an example of the Line Tests window.
Figure 4-7:
Page 4-8
Line Tests Window
P/N 762-50100D
5.
SYSTEM SPECIFICATIONS
CHARACTERISTIC
SPECIFICATION
Capacity
With HDSL or standard 2 Mbit/s G.703/6
interface:
Line interfaces
RU units
With integral OLTU cards:
Line interfaces
RUs
2W Analog Interfaces (CU and RU)
150
1 to 5
120
1 to 4
2W voice channel characteristics
Interfaces per card
Signaling
Metering per line
Polarity Reversal
Nominal impedance
ISDN U-Interface (2B1Q)
G.713
10
Loop Start
12/16 kHz
Optional
600Ω
U-Interface characteristics
Interfaces per card
Line Code
NT Remote feed voltage
4W Analog Interfaces
ETSI ETR 080
4
2B1Q
96 V
4W voice channel characteristics
Interfaces per card
Signaling
Nominal impedance
G.712
10
E&M
600Ω
Relative levels (default)
Rx:
Tx:
Other levels are available.
-14 dBr
+4 dBr
P/N 762-50100D
Page 5-1
5. System Specifications
CHARACTERISTIC
Environmental Conditions
Operating Temperature
CU
RU
-10°C to +45°C
-10°C to +55°C
Storage Temperature
CU and RU
-40°C to +85°C
Relative Humidity
Operating
Storage
Dimensions
Page 5-2
SPECIFICATION
0% to 95% (noncondensing)
Up to 95% (noncondensing)
CU
Width
Height
Depth
436 mm (19”)
311 mm (7U) including cable tray
260 mm
CRTC1
Width
Height
Depth
245 mm
355 mm
305 mm
CRTC2
Width
Height
Depth
205 mm
355 mm
305 mm
P/N 762-50100D
6.
GLOSSARY
ITU-T
International Telecommunication Union (formerly CCITT)
CLI
Calling Line Identification
CU
Central Unit
ETSI
European Telecommunications Standards Institute
HDSL
High-bit-rate Digital Subscriber Line
ISDN
Integrated Services Digital Network
ISP
Internet Service Provider
Mbit/s
Megabits per second
MU
Management Unit
PCM
Pulse Coded Modulation
PTP
Point to Point
RU
Remote Unit
SDH
Synchronous Digital Hierarchy
SPM
Subscriber Private Metering
TIMUX
Teledata Integrated Multiplexer
P/N 762-50100D
Page 6-1