Verilink SCC 2020 (880-503268-001) Product Manual - Manual (Page 59)

Verilink SCC 2020 User Manual 5-1
Chapter
5
Diagnostics
While installing your SCC 2020, or after it has been placed into
service, the Diagnostic routines allow you to troubleshoot or verify
the T1 circuit and Verilink equipment. The front panel of the SCC
2020 has three LEDs which give a visual indication of alarm
conditions.
Display elements on the Diagnostics Menu give current
information about possible alarm conditions as well as offering
command options which may be used to establish and terminate
loopbacks and test patterns.
Using Diagnostics
A typical way of using the Diagnostics Menu might involve the
following steps:
1. Establish a loopback somewhere in the circuit path.
2. Start transmitting a test pattern.
3. Observe the test error counter to see if the test pattern is
received as it was sent.
a. If no errors are observed, move the point of loopback
further away to test more of the circuit path, or
b. If errors are observed, move the point of loopback closer
to determine the source of the problem.
4. Stop the test pattern, drop all loopbacks, then:
a. Place the T1 circuit back into service if all tests passed, or
b. Contact the appropriate vendor if a problem was found.
Alarm Status In addition to offering the ability to put up and take down
loopbacks and test patterns, the Diagnostics Menu also offers
information about the current status of the DSX-1 equipment
interface and DS-1 network interface.
The top half of the Diagnostics Menu includes a drawing made up
of ASCII characters which represents the operation of the CSU. The
equipment interface is shown on the left and the network interface
is shown on the right. In the area to the left and right of the line
drawing of a framer, status information is represented by words
displayed in upper case characters.