Verilink SCC 2130 (880-503282-001) Product Manual - Manual (Page 62)

Diagnostics
5-8 Verilink SCC 2130 User Manual
NET LED The NET (network) LED is a tri-color indicator with six states, as
follows:
Table 5-5 Net LED States
Test Procedures
Testing may generally be divided into two categories, tests which
are conducted to verify an installation where no known problems
exist; and tests which result from an effort to troubleshoot a
problem which is known to exist.
Two procedures are described below. First, in the section
“
Verifying A T1 ”, a method is described to test a T1 circuit when it
is expected that no trouble will be found. Then, in the section
“
Troubleshooting ”, a suggested method for finding T1 problems is
detailed.
Verifying A T1 For this procedure a pattern will be sent from a local CSU, through
the entire transmit path of the T1 circuit, to a loopback in a far end
CSU, then back through the other direction of the T1 circuit.
First a loop-up code is sent, then a test pattern is transmitted.
The data received from the T1 circuit will be compared to the data
which was transmitted. If the data received is identical to the data
which was transmitted, the T1 is good and may be placed into
service.
State Meaning
Solid Green A normal signal is being received from the network (all OK)
Solid
Yellow
The SCC is looped toward the network via a line loopback (LLB)
or payload loopback (PLB) and no errors are being received from
the network
Solid Red Continuous errors are being received on the network interface
(e.g., LOS, LOF, RAI, AIS)
Flashing
Red to
Green
Bipolar violations or CRC-6 errors are being received on the
network interface
Flashing
Red to
Yellow
The CSU is looped toward the network and errors are being
received (BPV or CRC-6)
Not Lit The SCC has no power or, if other LEDS are lit, the SCC is
defective