
show sync
117380-A Rev. A 2-629
dsucsu_stats
Displays status information about a DSU/CSU module installed in a BayStack AN, ANH,
or ARN router. The display includes the following information:
Slot Base module slot that contains the DSU/CSU module. For BayStack routers,
the value is always 1.
Conn COM connector number (1, 2, or 3).
Op State Current V.54 loopback operating state of the interface. States are
• Normal (no loopback) -- The DSU/CSU is able to forward data.
• Local (analog) Loopback -- The DSU/CSU is performing a self-diagnostic
local loopback. While operating the local loop test, the CSU loops back the
network to avoid a carrier alarm.
• Digital Loopback -- The DSU/CSU is performing a diagnostic test of the
local DSU/CSU and the facility circuit. This test typically requires a pattern
generator on the remote side to transmit a test pattern, which is returned
through the CSU/DSU.
• Remote Digital Loopback -- The DSU/CSU is performing a diagnostic test
of the local DSU/CSU, facility circuit, and the remote DSU/CSU. This test
is a coordinated test with both sides of the facility. The router DSU/CSU
sends a signal to the facility to initiate a Digital Loop at the remote
DSU/CSU, and then sends a test pattern through the far side of the loop and
checks the returned data for errors.
• Pattern-2047 -- The DSU/CSU is performing a pattern-only test without
initiating loopback. The router DSU/CSU sends a BERT 2047 test pattern to
the network.
Service Status Current status of the DSU/CSU module, as reported by Out of Service or
Maintenance Mode codes from the Telco or network carrier. Service states are
• In Service -- The DSU/CSU and carrier facility are synchronized.
• Out of Service (OOS) -- There is trouble with the carrier facility circuit. The
circuit from the DSU/CSU module through local loop to the carrier is
working, but the circuit is down beyond the central office.
• Out of Frame (OOF) -- There is a framing problem on the carrier circuit.
• Loss of Line (LOL) -- The local loop to the central office is no longer
present. For example, the cable is not connected to the router DSU/CSU
interface.
• Telco Loopback -- The carrier facility placed the DSU or CSU in a loopback
test.
Out of Service
Errors
Number of OOS control codes (bipolar violations) received from the central
office.
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