Digital Unit Description
Description
21/1551-LZA 701 6001/1-V4 Uen B
Copyright
© Ericsson AB 2016. All rights reserved. No part of this document may be
reproduced in any form without the written permission of the copyright owner.
Disclaimer
The contents of this document are subject to revision without notice due to
continued progress in methodology, design and manufacturing. Ericsson shall
have no liability for any error or damage of any kind resulting from the use of
this document.
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Contents
Contents
1
Product Overview
1
1.1
Purpose
1
1.2
Variants
1
1.3
Overview
1
1.4
Warranty Seal
2
2
Function Description
3
2.1
Maintenance Button
4
3
Technical Data
6
4
DU Interfaces
7
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Digital Unit Description
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Product Overview
1
Product Overview
This document describes the Digital Unit (DU) for RBS 6000 systems used for
the GSM standard.
1.1
Purpose
The DU provides switching, traffic management, timing, and radio interfacing.
1.2
Variants
The DU variants are the following:
•
DUG 10 01
•
DUG 20 01
DUG 10 01 and DUG 20 01 support Evolved Edge level A.
1.3
Overview
This section provides an overview of the DU, as shown in Figure 1 .
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1
Digital Unit Description
DUG 20 01
!
-48VDC
GPS
EC
ET A
ET A
ET B
ET B
ET B
ET A
LMT B LMT A
LMT B LMT A
EC
EC
GPS
GPS
-48VDC
-48VDC
DUG 20 01
LMT B LMT A
DUG 10 01
!
ESB
F
RI F
F
E
RI E
E
D
RI D
D
C
RI C
C
B
RI B
B
A
RI A
A
ESB
ESB
!
DUG 20 01 Variant 1
DUG 20 01 Variant 2
Ge0993B
Figure 1
Overview DUG 10 01 and DUG 20 01
Information about DU placement can be found in RBS Description.
1.4
Warranty Seal
The unit is equipped with a warranty seal sticker.
Note:
2
Seals that have been implemented by Ericsson are not be broken or
removed, as it otherwise voids warranty.
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Function Description
2
Function Description
The DU has the following functions:
•
Timing function
•
Loadable software (from Flash Card)
•
Radio interface
•
Transmission handling
•
External synchronization
•
Tower Mounted Amplifier Control Module (TMA-CM) (only for DUG 10 01)
•
Controlling power and climate of the RBS
More information can be found in RBS Configurations.
For the block diagrams of the DUs, see Figure 2 (DUG 10 01) and Figure 3
(DUG 20 01).
DU
TMA-CM
Transmission
Radio
interface
Timing
Ge0911
Figure 2
DUG 10 01 Block Diagram
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3
Digital Unit Description
DU
Processing
Transmission
Baseband
Radio
interface
Timing
Ge0376A
Figure 3
2.1
DUG 20 01 Block Diagram
Maintenance Button
The maintenance button is used to activate one of four different modes or to
do a hardware reset. Table 1 lists the available functions activated by the
maintenance button.
Table 1
Available Functions for Maintenance Button
Function
Description
Technician Present
Mode
The Technician Present mode is used for
avoiding remote change of maintenance state
when a technician is present on-site.
Full Maintenance Mode During Full Maintenance mode the unit
suppresses all traffic and all alarms to be able to
perform maintenance on the unit.
HW Reset
The unit is restarted when HW Reset is activated.
No Maintenance Mode
During No Maintenance mode, the unit is
available for traffic and no alarms are
suppressed.
Alarm Suppressed
Mode
During Alarm Suppressed mode, alarms will still
be raised and put in the alarm list on the node,
but no new alarms or event notification will be
issued to Remote Manager Application (RMA).
The alarms already issued before Alarm
Suppressed mode are still active.
Figure 4 shows how to use the maintenance button to activate the different
functions, and what flashing pattern corresponds to what function. While
pressing the maintenance button the unit enters temporary states before
activating a mode, this is represented with dotted lines. When the button is
released the mode will be activated, this is represented with solid lines. The
4
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Function Description
hardware reset function is activated after pressing the maintenance button
more than 7 seconds.
HW Reset
OFF
Button pressed, less than 7 seconds, a second time
No Maintenance
HW Reset
Mode
Indicator
Test
Button Pressed
Technician Present Activated
Button Released (RU)
Flickering
Flickering
Suppressing
Button Released (DU)
Alarms
Indicator
Test
2 Seconds
Elapsed
Flashing Slowly
Flashing Slowly
Button Released
Removing
HW Reset
7 Seconds
Elapsed
Hardware
Reset
Indicator
Test
HW Reset
Indicator
Test
Traffic
Traffic
Removed
ON
Full Maintenance
Mode
Ge4098
Figure 4
Maintenance Button Work Flow
For more information about the maintenance button, refer to Indicators,
Buttons, and Switches.
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Digital Unit Description
3
Technical Data
Technical data for the DU is listed in Table 2 .
For information about power consumption, see Power Consumption Guideline
for RBS 6000.
Table 2
Digital
Unit
6
Technical Data
Capacity Data
Dimensions
Maximum Carrier
Capacity, (Measured
in Carrier Elements)
Height
Width
Depth
DUG
10 01
12 GSM carriers
350 mm
30 mm
285 mm <2 kg
DUG
20 01
12 GSM carriers
350 mm
30 mm
280 mm < kg
Weight
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DU Interfaces
4
DU Interfaces
The signalling and power interfaces for the DU are listed in Table 3 .The DUG
10 01 and DUG 20 01 have different radio interfaces. This is because the
DUG 10 01 uses the architecture from RBS 2000, with the baseband circuitry
on the Radio Unit (RU) (the RUG 11). Instead of a separate unit for TMA-CM
(as in RBS 2000), this functionality is included in the DUG 10 01, and could
also be used for antenna supervision. Only electrical connection between the
DU and RU is supported. The DUG 20 01 uses the same architecture as the
other radio standards in RBS 6000 (WCDMA and LTE), with the baseband
circuitry on the DU connected over the standardized CPRI (2.5 Gbps)
interface to a Radio Unit multi-Standard (RUS). The RU does in this case
include the TMA-CM functionality and the CPRI interface supports both
electrical and optical connection (the latter for main-remote configurations).
For more information on which Small Form-factor Pluggable (SFP) module to
use, see Spare Parts Catalog.
Table 3
DU Interfaces
Marking
Interface
Description
Optical
Indicator
Power(1)
ET20 A
-48 V DC
No
-48 V DC(2)
Power
GPS
RJ-45
Global Positioning
System (GPS) interface
including GPS power
No
EC
RJ-45
Enclosure control
Yes
EC-bus common
Optical indicator, green
LMT A
RJ-45
Local Management
Terminal (LMT) A
No
LMT B
RJ-45
Site LAN and LMT B
Yes
Optical indicator, green
ET A
RJ-45
E1/T1 port
Yes
Optical indicator, green
ET B
RJ-45
E1/T1 port
Yes
Optical indicator, green
-
Fault
Yes
Optical indicator, red
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Digital Unit Description
Marking
Interface
Description
Optical
Indicator
-
Operation
Yes
Optical indicator, green
-
Maintenance
Yes
Optical indicator, blue
Maintenance button
No
For information about the
maintenance button, see
Section 2.1 on page 4.
-
Status
Yes
Optical indicator, yellow
ESB
HSIO
RI A - RI F(1)
Yes
Y-link, 6 x HSIO(1) Radio Interface A–F
including Tower Mounted
CPRI, 6 x SFP(2) Amplifier (TMA) power
for DUG 10 01.
A - F(2)
For synchronization with
other GSM digital units
like DUG or DXU.
No
Optical indicator, green
(1) DUG 10 01.
(2) DUG 20 01.
For more information about optical indicators, refer to Indicators, Buttons, and
Switches.
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