152-388-100-02, Issue 2Testing

 

Table 14.

Front-Panel System Alarms Summary (Continued)

 

 

 

 

Front-Panel

Alarm

Description

To Inhibit

Message (a)

LOF

Loss of Frame

The DS1 input does not contain the ESF or

Change FRMG option to AUTO or UNFR.

 

 

SF frame pattern setting of the FRMG

 

 

 

option.

 

 

 

 

 

PRMF

Performance Report

Indicates H2TU-R PRM-FE BER threshold

Set DBER threshold to DIS.

 

Messaging - Far End

is exceeded.

 

 

 

 

 

PRMN

Performance Report

Indicates H2TU-R PRM-NE BER threshold

Set DBER threshold to DIS.

 

Messaging - Near End

is exceeded.

 

xxxx-HBER (c) HDSL2 Block Error

The HDSL2 BER has exceeded the set

Rate

threshold limits of 10-6or 10- 7. (xxxx

 

denotes either TUC or TUR. If TUC and

 

TUR occur at the same time, then TUC

 

displays.)

Select NONE for the HBER system option.

xxxx-MAL (c)

Margin Alarm

The margin on the HDSL2 loop has

 

 

dropped below the minimum threshold

 

 

value set for the system. (xxxx denotes

 

 

either TUC or TUR. If TUC and TUR occur

 

 

at the same time, then TUC displays.)

Set the Margin Alarm Threshold option to 0 (zero).

xxxx-LA(c)

Loop Attenuation

The attenuation on the HDSL2 loop has

 

 

exceeded the maximum value set for the

 

 

HDSL2 loop attenuation threshold. (xxxx

 

 

denotes either TUC or TUR. If TUC and

 

 

TUR occur at the same time, then TUC

 

 

displays.)

Set the HDSL2 Loop Attenuation Threshold option to zero.

(a)The message, ALRM, displays prior to any alarm message.

(b)Message displays repeatedly as long as the alarm condition exists and is not included in the priority order.

(c)Only these alarms assert the System Alarm bus on pins 20 and 21 of the card-edge connector if the ALM option is enabled.

(d)When the HDSL2 loop loses sync word (LOSW), a system alarm condition exists. However, since the H2TU-C-388 enters the acquiring mode, the front-panel status LED flashes red, and the ACQ or SIG message displays instead of the ALRM message.

Alarm Option for DLC Feed

To improve HiGain compatibility with the switch-to-protect features used in DLC feeder applications, the H2TU-C-388 List 1 has an Alarm Pattern (ALMP) option that allows you to select either an AIS or LOS DS1 output payload for the following alarms:

•LOSW on any loop

•LOS DS1

Retiring System Alarms

To retire a system alarm, press the SEL button to execute an Alarm Cutoff (ACO). An ACO turns the alarm off and replaces the ALRM message with an ACO message. The second part of the ALRM message, which defines the cause of the alarm, remains. Both parts of the message remain until the alarm condition clears or another higher priority alarm occurs.

H2TU-C-388 List 1

June 6, 2000

37