Error Leds; Loopback Leds - Interphase RAS Communications Controller 5536 User Manual

Interpreting Line Status Indicators

Error LEDs

The following error LEDs indicate port error events that
generate communication problems:
LED Meaning
BiPolar Violation. For an AMI-coded signal, the occurrence of a
BPV
pulse of the same polarity as the previous pulse causes a BPV
error event.
Path Coding Violation.
PCV
• In D4 and E1-nonCRC formats, a frame synchronization bit
• In ESF and E1-CRC formats, a CRC error
Controlled Slip. Results from the replication or deletion of the
CS
payload bits of the DS1 frame.
A Controlled Slip may be performed when there is a timing
difference between a synchronous receiving terminal and the
received signal.

Loopback LEDs

The following Loopback LEDs indicate whether the port is in
a loopback mode (which can be why it isn't running normally):
LED Meaning
The signal returned toward the source of the loopback command
Payload
consists of the payload of the received signal (with bit sequence
integrity retained), and newly-generated ESF framing.
The signal returned to the loopback command source consists of
Line
the full signal. Bit sequence integrity is maintained, framing is
not changed, and Bipolar Violations are not removed. (See
LEDs on page 174
174
error
for information about Bipolar violations.)
Error
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