TDM Port Alarms and Remedies

The following table shows the TDM port alarm conditions detected and generated in different configuration setting, with and without the port being part of a TDM service bound to a CES pseudowire with suggested remedies.

Alarm	Description	Remedy
LOS	This condition occurs on the TDM port when the local end of the TDM port is in Loss of Signal state. The mismatch in the configured hierarchy, cable length or line gain parameters results in the Loss of Signal state in the local end of the TDM port.	The hierarchy configuration and the interface parameters such as cable length or line gain needs to be reviewed. If no configuration deviations are observed, the transmit clocking option in the remote end requires to be reviewed to isolate the possibility of using an unavailable clock.
LOF	This condition occurs on the framed TDM port when the local end of the TDM port is in Loss of Frame state. The mismatch in the transmitted framing format in the local end and the configured framing format in the remote end results in the Loss of Frame state in the local end of the TDM port.	The framing configuration in the local and remote end of the TDM port needs to be reviewed. If no configuration deviations are observed, the fault due to unstable clock can be isolated by performing loopback tests on the local and/or remote end of the TDM port.
TxRAI	This condition occurs on the framed TDM port due to either of the two cases: When there is a mismatch in the configured and received framing format. In this case, the transmission of remote alarm indication is triggered by the Loss of Frame state in the local end of the TDM port. In the presence of CES pseudowires on the TDM port, when the remote end of the CES pseudowire sends an RDI (Remote defect indicator) signal, RAI is transmitted on the TDM port.	If there are CES pseudo-wires defined on the port, the pseudowire remote fault can be referred to. In the presence of attachment circuit Tx fault, no action is required. If there are no CES pseudo-wires defined, the framing configuration on the TDM port needs to be reviewed. Additionally, if no configuration deviations are observed, the fault due to unstable clock can be isolated by performing loopback tests on the local and/or remote end of the TDM port. This condition, if occurs on the unframed TDM port, can be cleared by administratively disabling and enabling the TDM port. The following framing configuration in local/remote would cause RAI to be generated from the local end:
RxRAI	This condition occurs on the framed TDM port due to either of the two cases: The Loss of Frame state in the remote end of the TDM port. The application associated with the remote end of the TDM port tunnels the alarm indication to the local end. The mismatch in the transmitted framing format in the local end and the configured framing format in the remote end results in the Loss of Frame state in the remote end of the TDM port.	If this condition occurs due to the Loss of Frame state in the remote end of the TDM port, the framing configuration on the TDM port needs to be reviewed. Additionally, if no configuration deviations are observed, the fault due to unstable clock can be isolated by performing loopback tests on the local and/or remote end of the TDM port. If this condition occurs due to the application associated with the remote end of the TDM port, no action to be taken. This condition, if occurs on the unframed TDM port, can be cleared by administratively disabling and enabling the TDM port.
TxAIS	This condition occurs on the unframed TDM port due to either of the two cases: The AIS is transmitted on the TDM port by default in the absence of loopback or CES pseudowire configuration. In the presence of CES pseudowires on the TDM port, the AIS is transmitted to indicate the remote end pseudowire faults, namely, local end loss of packet state and remote end attachment circuit fault.	If no CES pseudowire is configured on the TDM port, no action is required. If CES pseudowires are configured on the TDM port, the pseudowire fault information should be referred to for the remote end fault indication. This condition, if occurs on a framed TDM port or occurs on an unframed TDM port with no remote end fault indication in the CES pseudowire, can be cleared by administratively disabling and enabling the TDM port.
RxAIS	This condition occurs on the framed TDM port when the remote end of the TDM port transmits an AIS alarm indication.	This condition requires no action to be performed. If CES pseudo-wires are present on the TDM port, this condition is signaled as local attachment circuit Rx fault.

Published March 2020prev | next

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