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September 1999 P/N 880-503284-001-A1 - page 50 / 65

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Diagnostics

Diagnostics Menu

A sample of the Diagnostics Menu is shown below in Figure 5-1.

In this example, the word PULSES appears on both the equipment (left hand) and network (right hand) sides of the display. When the words PULSES appears alone, that interface has no alarms.

Figure

5-1 CSU

Diagnostics

Menu

DIAGNOSTIC

-- FW

Rev

1.4

HW Fab 0.8

Type NCC 2020 --

|

|r|

| PULSES

|

|a|

|

|

|m|

|

|

|e|

|

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

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

  • -------

    << eq

|

|

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

PULSES

  • -------

    >> eq

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

|

|

X) exit menu

Y) enable loops

Z) reset alarm

T) test time (15 SEC)

__

net signals__

1)

qrss

2)

3 in 24

3)

1 in 8

4)

all 1s

__eq loops__

__err counter__

R) repeater

A) show cntr

E) equip

B) clear cntr

L)

line

P)

payload

U)

inband up

D)

inband down

__

net loops

__

N) end tests

[1,1] NEAR TAC 2010 >

Since a T1 circuit operates by sending pulses to represent a logical “one”, the indication PULSES means that the T1 CSU portion of this NCC 2020 does see pulses on both the equipment (left side) and network (right side) interfaces. Therefore, of all the messages which might appear on this menu in upper case characters, PULSES is the only message which does not represent an alarm condition. Pulses are the logical opposite of a Loss Of Signal (LOS) condition.

Figure 5-2 below shows the result of disconnecting the T1 circuit from an NCC 2020 module. The word PULSES no longer appears on the right hand side where network status is indicated. Instead, a number of alarm conditions are reported including ALARM, FRAME LOSS, CRC ERRORS, and SIGNAL LOSS.

NOTE: Whenever a T1 CSU reports Signal Loss, it will report other alarms as well. The other alarms are caused by the signal loss condition. Ignore the other alarms and find the cause of the Signal Loss to restore the T1 to service.

5-2

Verilink NCC 2020 User Manual

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