IPmux-1/1E Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
Frequently Asked Questions 4-27
4.5 Frequently Asked Questions
Question: How does the IPmux handle/propagate alarms on the TDM and
Ethernet side?
Answer
The IPmux handles alarms on the TDM and Ethernet side in the following manner:
TDM Side Alarms:
Unframed mode:
1. In case of LOS (Loss Of Signal) on the local IPmux side, AIS will be sent towards
the IP side, and will then be transferred over the E1/T1 to the remote TDM device.
2. All other alarms sent from the near-end TDM device (including information on
timeslot 0), will be propagated transparently by the local IPmux, to the remote end
TDM device (over the IP connection).
Framed mode:
In case of LOS/LOF/AIS detected on the local IPmux side, a user-configurable
conditioning pattern (00 to FF) will be sent on the relevant time slots (over the IP
connection), to the far-end TDM device. A user-configurable conditioning pattern
can also be applied on the ABCD bits (CAS signaling 1 to F) going towards the
remote PBX.
The frame synch on the E1/T1 level is maintained in favor of the end TDM
devices.
Ethernet Side Alarms:
Unframed mode:
In case of local failure on the IPmux, or a situation of jitter buffer
underflow/overflow, an (unframed) AIS will be sent towards the near-end TDM
side
Framed mode:
In case of local failure on the IPmux, or situation of jitter buffer
underflow/overflow, a conditioning pattern (00 to FF) will be sent towards the
near-end TDM device on the time slots related to that specific bundle. A user-
configurable conditioning pattern can also be applied on the ABCD bits (CAS
signaling 1 to F), going towards the local TDM device.
In this case the synch on the E1/T1 level is maintained in favor of the TDM end
devices.