ATL Telecom AM2048 - Manual (Page 28)

ascom
telecom USER GUIDE AM768A/AM2048A
28
Issue 8
4.10.4 ETS 300 233 Loopbacks
Loop 1 and Loop2 may be activated by sending patterns using spare bits 5 and 6 in TS0.
Table 1 CrC4 Multiframe Structure
Bits 1 to 8 of the PCM frame (i.e. time slot 0) Sub-
multiframe Frame
number
1 2 3 4 5 6 7 8
0 c1 0 0 1 1 0 1 1
1 0 1 A Sa4 Sa5 Sa61 Sa7 Sa8
2 c2 0 0 1 1 0 1 1
3 0 1 A Sa4 Sa5 Sa62 Sa7 Sa8
4 c3 0 0 1 1 0 1 1
5 1 1 A Sa4 Sa5 Sa63 Sa7 Sa8
6 c4 0 0 1 1 0 1 1
I
7 0 1 A Sa4 Sa5 Sa64 Sa7 Sa8
8 c1 0 0 1 1 0 1 1
9 1 1 A Sa4 Sa5 Sa61 Sa7 Sa8
10 c2 0 0 1 1 0 1 1
11 1 1 A Sa4 Sa5 Sa62 Sa7 Sa8
12 c3 0 0 1 1 0 1 1
13 E 1 A Sa4 Sa5 Sa63 Sa7 Sa8
14 c4 0 0 1 1 0 1 1
Multi-
frame
II
15 E 1 A Sa4 Sa5 Sa64 Sa7 Sa8
ELU NTU Network
ELU NTU
Network
Loopback 1
Loopback 2