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Diagnostics

Figure

5-2 CSU

Diagnostics

Menu

DIAGNOSTIC

-- FW

Rev

1.4

HW Fab 0.8

Type NCC 2020 --

|

|r|

| SIGNAL LOSS

|

|a|

|

|

|m|

| CRC ERRORS

|

|e|

|

|-----------------------| ALARM

|-----------------------|

  • -------

    << eq

|

| FRAME LOSS

<<-------|----------|f|----------|-------<< net <<-------

PULSES

  • -------

    >> eq

>>-------|----------|r|----------|------->> net >>-------

|

|

X) exit menu

Y) enable loops

Z) reset alarm

T) test time (15 SEC)

Message

Meaning

ALARM

Yellow Alarm (RAI) —The CSU is receiving a Remote Alarm Indication Signal on the port. This signal is sent by a device in a red alarm condition, such as AIS, LOS or LOF.

FRAME LOSS

Out Of Frame (OOF) —The CSU does not detect a valid framed signal on the port. If pulses are also present, may indicate receipt of unframed all ones, Alarm Indication Signal (AIS), which is often used as a Keep Alive signal on T1 circuits.

Table 5-1

Diagnostic Menu Status Messages

__

net signals__

1)

qrss

2)

3 in 24

3)

1 in 8

4)

all 1s

Status Messages

The status messages which may appear on the Diagnostics Menu are listed in Table 5-1 below:

SIGNAL LOSS

Loss Of Signal (LOS) —The CSU does not detect any pulses on the port, this is the worst possible alarm condition on a T1 port, ignore other alarms and resolve the cause of the LOS first.

CRC ERRORS

Cyclic Redundancy Check errors (CRC-6) —The CSU detects errors using the CRC-6 feature of ESF framing. Applies only to T1 circuits or equipment using ESF framing.

LOW DENSITY BPV

The T1 signal on the port does not meet the required average ones density of 12.5%.

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.

__eq loops__

__err counter__

R) repeater

A) show cntr

E) equip

B) clear cntr

EXT CLK LOSS PULSES

The CSU is configured to use an external clock signal and that signal is not detected.

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.

L)

line

P)

payload

U)

inband up

D)

inband down

__

net loops

__

N) end tests

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Verilink NCC 2020 User Manual

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