Verilink TAC 2130 S/T (880-503296-001) Product Manual - Manual (Page 48)

Diagnostics
5-4 Verilink TAC 2130 User Manual
Table 5-1 Diagnostic Menu Status Messages
Diagnostic
Commands
There are twelve command options available on the IDCSU
Diagnostics Menu.
Table 5-2 lists all of these commands in right
to left order:
Information about the various loopbacks can be found in the
manual
AS2000, The Basics .
Message Meaning
ALARM Yellow Alarm (RAI)—The IDCSU is receiving a Remote Alarm Indication Signal on the
port. This signal is sent by a device in a red alarm condition, such as AIS, LOS or LOF.
FRAME LOSS Out Of Frame (OOF)—The IDCSU does not detect a valid framed signal on the port. If
pulses are also present. Can indicate receipt of unframed all ones—Alarm Indication
Signal (AIS)—which is often used as a Keep Alive signal on T1 circuits.
SIGNAL LOSS Loss Of Signal (LOS)—The IDCSU does not detect any pulses on the port. This is the
worst possible alarm condition on a T1 port. Ignore other alarms and resolve the
cause of the LOS first. For a DTE port reporting LOS, it means the LOS option is
configured to expect RTS or DTR from the DTE and that signal is not present.
CRC ERRORS Cyclic Redundancy Check errors (CRC-6)—the IDCSU detects errors using the CRC-6
feature of ESF framing. Applies only to T1 circuits using ESF framing.
BPV The IDCSU is detecting bipolar violations on the port. Two or more pulses in a row
were of the same polarity, violating the Alternating Mark Inversion requirement.
EXT CLK LOSS The IDCSU is configured to use an external clock signal and that signal is not
detected. External clock is supported in the TAC 2130—not in the TAC 2130-S or TAC
2130-T.
PULSES Not an alarm condition. The IDCSU does see valid pulses on the port. PULSES should
always be displayed on the DTE side of the menu.