Transmission Interface Handling DS1 1544 kbit/s
Downstream The path for information from the BSC to
the MS.
Upstream The path for information from the MS to
the BSC.
Linear Cascade Chain A cascade of RBS:s according to Figure
40 on page 201.
01_0428A
RBS 2
PCM-A
PCM-B
PCM-A
PCM-B
RBS 1
BSC
DXB
DXB
Transport network
Figure 40 Two RBSs in a linear cascade chain
CMRU Central Main Replaceable Unit. An RBS
has exactly one CMRU. In the RBS 2000
hardware architecture the Distribution
Switch is the 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:
• Short haul
• Long haul
The functionality described under the heading Basic is common for both
short and long haul.
Basic
•
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
, resistive).
EN/LZT 123 2697 R5A
1998-08-13
201 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
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