ATL Telecom AM2048 - Manual (Page 29)

ascom
telecom USER GUIDE AM768A/AM2048A
29
Issue 8
Table 2 Loopback code definitions
State DS-ET Sa5 Sa6
Loopback 1 command <-- 0 1111
Loopback 2 command <-- 0 1010
Loopback acknowledge --> 0 XXXX
Loopback release
command <-- 0 0000
These loop activation codes are only detected at the G.703 interface at the ELU when CRCs are
enabled.
Loop 1 is the equivalent of a local loop at the ELU.
Loop 2 is the equivalent of a remote loop set from the ELU.
Note, the specification did not anticipate point to multipoint so in this mode loop 2 is not meaningful.