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Chapter 13. SNMP Management

13-4 ATLAS 550 User Manual 61200305L1-1

DS1 Traps

The ATLAS 550 supports RFC1406, the DS1 standard MIB, as well as the

ADTRAN DS1MIB, an extension to RFC1406. The ADTRAN DS1 group al-

lows you to send traps for DS1 alarm failures (DS1 alarm traps) and perfor-

mance threshold crossing alerts (DS1 alert traps).

DS1 Alarm Traps

The ADTRAN DS1 extension MIB contains a DS1 Alarm Table which holds

entries that enable status bits to send an alarm trap. Each Alarm Table row

entry corresponds to a DS1interface managed bythe device.DS1 line status

is reported in the bit-encoded dsx1LineStatus object variable. Each trap rep-

resents a bit value equal to 1 change in the dsx1LineStatus. Table 13-2 de-

scribes the DS1 alarm traps supported by the ATLAS 550.

When enabled,the ATLAS 550 sends alarm traps to the each member of the

trapdestinationlistupondetectingstatusbitchangesindsx1LineStatus.Each

statuschange sets an event bit = 1inthe adDS1LineEventvariableintheDS1

alarm table. If you have previously set the corresponding enable bit in the

adDS1LineArmvariableequaltoone and ifadDS1AlarmEnable = On,thenthe

ATLAS 550 sendsan alarm trap message. A single alarm trap message may

report multiple event changes.

Clearing DS1 Alarm Traps

The ATLAS 550 clears the event bits after sendingthe trap message or send-

ing the response to a Get request for the adDS1LineEvent variable.

DS1 Alert Traps

The ADTRAN DS1extensionMIB contains theDS1 AlertTablewhich holds

entries that enable event bits to send an alert trap. Each Alert Table row en-

trycorrespondstoaDS1interfacemanagedbythedevice.Asinglealerttrap

may report multiple event changes.

RFC1406 also defines a series of Current and Total Alert threshold values.

You can enablethe ATLAS 550 to send an AlertTrap toeach member of the

trap destination list when accumulated error statistics exceed these

Table 13-2. DS1 SNMP Alarm Traps

Alarm Severity Description

adATLAS550NoAlarm Warning No alarms are present.

adATLAS550RxYellow Minor The Far End is experiencing Red Alarm (a.k.a. Yellow Alarm).

adATLAS550TxYellow Warning

The Near End is sending Loss Frame Indication (a.k.a. Yellow Alarm).

adATLAS550RxAIS Minor

The Far End is sending Alarm Indication Signal (a.k.a. Blue Alarm).

adATLAS550TxAIS Warning

The Near End is sending Alarm Indication Signal (a.k.a. Blue Alarm).

adATLAS550RedAlarm Major The Near End is experiencing Loss of Frame (a.k.a. Red Alarm).

adATLAS550LOS Major The Near End is experiencing Loss of Signal.

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