User's Manual Part 2

RBS 2308 and RBS 2309 User’s Guide
7.6.11 Defining PCM
This section descr
ibes how to define the PCM parameters for transmission.
• For transmission interface E1, 75 Ω, see Page 126
• For transmission interface E1, 120 Ω, see Page 126
• For transmission interface T1, 100 Ω, see Page 128
Transmission Interface E1, 75 
This section describes how to define the PCM parameters for transmission
interface E1, 75 Ω.
1. On the Configuration menu, click Define and PCM.
2. Set the parameters according to the table and instructions below.
3. Click OK when all parameters are set.
Table 36 PCM Parameter Settings for Transmission Interface E1, 75 Ω
PCM Parameter Settings
Transmission Interface
E1
Network Topology
See Site Installation Documentation
Sync Source See Site Installation Documentation
CRC-4 See Site Installation Documentation
Spare bits See Site Installation Documentation
A
Short haul
B
Short haul
C Short haul
Receiver Sensitivity
D
Short haul
Transmission Interface E1, 120 
This section describes how to define the PCM parameters for transmission
interface E1, 120 Ω.
Note: Calculating the total attenuation of the entire R BS chain is only
necessary if multidrop (in combination with OVPs with bypass relays)
is used.
1. On the Configuration menu, click Define and PCM.
2. Set the parameters according to the table and instructions below.
3. Click OK when all parameters are set.
126
EN/LZT 720 0027 Uen R8A 2006-06-27