Verilink APS 2000 T1 Line Protection (880-502411-001) Product Manual - Manual (Page 70)

Diagnostics
5-6 Verilink APS 2000 User Manual
Diagnostic
Commands
There are seventeen command options available on the SCC 2120
Diagnostics Menu.
Table 5-2 lists all of these commands:
Table 5-2 Diagnostic Commands
BPV The CSU 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 CSU is configured to use an external clock signal and that signal is not detected.
PULSES Not an alarm condition, the CSU does see valid pulses on the port. When a CSU is in
Mux mode, PULSES should always be displayed on the equipment side of the menu. In
Mux mode only synchronous serial interfaces are used and the CSU does not expect
to see any particular framed pattern of pulses.
Message Meaning
Menu Option Description Instructions
X) exit menu Exits to menu above. Returns to the SCC 2120 Main Menu
Y) enable loops Determines whether
CSU will respond to
received standard CSU
loop-up codes.
Normally this selection should be enabled
In a telephone carrier central office environment this option
might be disabled
Z) reset alarm Clears alarm history
for the current 15
minute interval.
Extinguishes red LED alarm conditions on front panel of the
SCC 2120 CSU after installation or after resolving a service
problem
T) test time Sets the length of time
tests and loopbacks
will be allowed to run.
FOREVER is suggested
by Verilink.
ENTER INTERVAL (DEFAULT, x SEC, x MIN, x HR, FOREVER):
Type FOREVER or type a numeric value followed by SEC for
seconds, MIN for minutes, HR for hours
example 45MIN
R) repeater Establishes a repeater
loopback.
Useful for testing local
CSU hardware.
The CSU loops data it is about to transmit back to the receive
circuitry, local equipment should see its own signal
This test is functionally equivalent to placing a T1 loopback
plug into the network port of the CSU
E) equip Establishes an
equipment loopback.
The local DSX-1 equipment port is looped back directly to the
local equipment, useful for verifying cable connections
A) show cntr Displays test error
counter, increments
for each error
detected.
Used to monitor a test in progress, when the CSU transmits a
test pattern, it expects to receive the same test pattern
unaltered, either from a loopback or a compatible test signal
source
B) clear cntr Resets test error
counter.
Used to reset the test error counter to zero after a test or
before a new test
N) end tests Ends tests and LOCAL
loopbacks.
Used to end any running test patterns as well as terminating
any loopbacks in the local CSU
1) qrss Starts QRSS test. CSU transmits a Quasi-Random test pattern while monitoring
the receive pair for the same signal to be returned
This test is widely supported by telephone carrier test
facilities
This test pattern is valid for all T1 circuit types