Alarm Handling in Global Call

Owned by Nathaniel Halbrooks
Dec 20, 2023
3 min read

Introduction

 This article lists the types of alarms that are available for each technology and provides tips on what to do to resolve an alarm.

1.  Analog 

Analog alarms are not handled by the Dialogic Global Call Alarm Management System (GCAMS), and are therefore not configurable. They will throw a GCEV_BLOCKED event and then return with a GCEV_UNBLOCKED event once cleared. When an unexpected GECV_BLOCKED occurs, you should check the wiring connections to the Dialogic board.

2.  T1/E1 CAS/R2/ISDN 

These alarms are all handled by GCAMS, so that they can be configured to send a GCEV_BLOCKED event to your application. Refer to Chapter 8 of the Dialogic Global Call API Programming Guide for more information.
 

 Alarm

T1

E1

Definition

Recovered Event

 

CAS

ISDN

CAS/R2

ISDN

 

 

 

JCT

JCT

JCT

JCT

 

 

B8ZSD

x

x

 

 

Bipolar Eight Zero Encoding is detected

*_B8ZSDOK

BPVS

x

x

x

x

Bipolar Violations counter becomes saturated

*_BPVSOK

CECS

 

 

x

x

CRC4 Error counter becomes saturated

*_CECSOK

CRC_CFA

 

 

 

 

Timeslot 16 received all 1s for frames of two consecutive multiframes

*_CRC_CFAOK

DCHAN_CFA

 

 

 

 

D-Channel is out of service (unable to send call control messages)

*_DCHAN_CFAOK

DPM

x

x

x

x

Failure of the driver's tip and ring output monitor is detected

*_DPMOK

ECS

x

x

x

x

General Error counter is saturated

*_ECSOK

FERR

x

 

 

 

Frame Bit Error

*_FERROK

FSERR

 

 

x

 

Frame Sync Error

*_FSERROK

LOS

x

x

x

x

Loss of Signal Error

*_LOSOK

LOOPBACK_CFA

 

 

 

 

Loopback (Diagnostic) Mode is configured

*_LOOPBACK_CFAOK

MFSERR

 

 

x

x

Multiframe Sync Error

*_MFSERROK

OOF

x

x

 

 

Out of Frame Error counter is saturated

*_OOFOK

RBL

x

x

 

 

Blue Alarm/Transmit Alarm is detected

*_RBLOK

RCL

x

x

 

 

Carrier Loss is detected

*_RCLOK

RDMA

 

 

x

x

Distant Multiframe Sync Error

*_RDMAOK

RED

x

x

x

x

Red Alarm/No Sync detected

*_REDOK

RLOS

x

x

x

x

Remote Loss of Sync Error

*_RLOSOK

RRA

 

 

x

x

Alarm on Remote side detected

*_RRAOK

RSA1

 

 

x

x

Received Signalling All 1s error

*_RSA1OK

RUA1

 

 

x

x

Received Unframed All 1s error

*_RUA1OK

RYEL

x

x

 

 

Yellow Alarm/Remote Alarm detected

*_RYELOK

NOTE

The complete alarm names have a prefix that signifies the technology.  For instance: DTT1_RYEL is a T1 alarm and DTE1_RUA1 is an E1 alarm.


Alarm Resolution

  • Check the configuration for the interface to make sure it matches the other side of the connection. Go through the Dialogic Configuration Manager (DCM) and make sure that the format and protocol settings agree with the settings on the line.

  • Check the wiring between the Dialogic board and the demarcation point (or other end point) - make sure it is complete and undamaged.

  • Call your service provider – if the wiring and configuration is correct, then there may be issues on the Service Provider side of the connection

3.   IP QoS

These alarms are activated by counters set to alert the application when thresholds set by the user are exceeded

  • EVT_DTMFDISCARDED    - alarm indicating # of lost DTMF digits that were lost or unprocessed

  • EVT_LOSTPACKETS - # of packets lost during the call

  • EVT_JITTER – Average jitter rate since beginning of call

Alarm Resolution

Check the quality of the network, making sure there are no bottleneck points or latency issues.

Product List

Dialogic D/240JCT-T1 Media Board
Dialogic D/480JCT-1T1 Media Board
Dialogic D/480JCT-2T1 Media Board

 

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