Functions - Ericsson CME 20 R6.1 Reference Manual

Downstream
Upstream
Linear Cascade Chain
Figure 40
CMRU
33.3

Functions

33.3.1 DS1 Transmission
The function is initiated during restart of CMRU.
The function can be in one of the following two modes:
•
•
The functionality described under the heading Basic is common for both
short and long haul.
Basic
•
EN/LZT 123 2697 R5A
1998-08-13
Transmission Interface Handling DS1 1544 kbit/s
Transport network
BSC
Two RBSs in a linear cascade chain
Short haul
Long haul
Physical and electrical characteristics according to ANSI T1.403
(interface at 1544 kbit/s, one pair for each direction of
transmission, test load impedance 100
© Ericsson Radio Systems AB
— All Rights Reserved —
The path for information from the BSC to
the MS.
The path for information from the MS to
the BSC.
A cascade of RBS:s according to Figure
40 on page 201.
RBS 1
DXB
PCM-A
PCM-B
RBS 2
DXB
PCM-A
PCM-B
Central Main Replaceable Unit. An RBS
has exactly one CMRU. In the RBS 2000
hardware architecture the Distribution
Switch is the CMRU.
, resistive).
01_0428A
201 (306)