All MIBs › CISCO-WAN-CODEC-GEN-PARM-MIB › vismCodecJitterInitialDelay
vismCodecJitterInitialDelay
Module: CISCO-WAN-CODEC-GEN-PARM-MIB
OID (symbolic): CISCO-WAN-CODEC-GEN-PARM-MIB::vismCodecJitterInitialDelay
OID (numeric): 1.3.6.1.4.1.351.150.21.1.1.1.1.3
Node type: OBJECT-TYPE
Type: INTEGER
Access: read-write
Description: This object defines the jitter buffer size in milliseconds. If the vismCodecJitterDelayMode is set to be 'fixed', the jitter buffer is fixed at this value for the duration of the call, if it is set to 'adaptive', the value of this object is the initial jitter buffer size, and the DSP will adapt to an optimal size dynamically.
For G.711u, G.711a, Clear Channel, the default value is 100 ms.
For lossless the default value is 16ms.
For 'g726r32000', 'g729a', 'g729ab', 'g726r16000', 'g726r24000','g726r40000', 'g723h','g723l', 'g723ah' and 'g723al' the default value is 60 ms.
The jitter buffer size of this object differs for each set of codecs supported on VISM card. A set of codecs supported is identified by vismCodecTemplateNum object(defined in CISCO-VISM-CODEC-MIB MIB).
For codecs in template number 1, 3, 4, and 5: the jitter buffer size is as follow: 'zero', 'five', 'ten' 'fifteen', 'twenty', 'thirty', 'fourty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninty', 'hundred'.
For codecs in template 2, the jitter buffer size is as follow: 'zero', 'five', 'ten', 'fifteen', 'twenty', 'twentyfive', 'thirty', 'thirtyfive', 'fourty', 'fortyfive', 'fifty', 'fiftyfive', 'sixty', 'sixtyfive', 'seventy', 'seventyfive', 'eighty', 'eightyfive', 'ninty', 'ninetyfive', 'hundred'.
When the codec template changes, the value of this object will be implicitly set to the default value.
What is vismCodecJitterInitialDelay?
This read-write enumerated object defines the jitter buffer size in milliseconds; when vismCodecJitterDelayMode is fixed, the buffer stays at this size for the whole call, while in adaptive mode this value is only the starting point before the DSP adjusts it, with a default of 100 ms for G.711u, G.711a, and Clear Channel codecs. An administrator tunes this to balance voice-quality jitter smoothing against added call latency. For example, a voice call over a particularly jittery WAN path might use a larger initial delay value than the 100 ms default to better absorb variable arrival timing.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.351.150.21.1.1.1.1.3 snmpwalk -v2c -c public <target> CISCO-WAN-CODEC-GEN-PARM-MIB::vismCodecJitterInitialDelay
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.351.150.21.1.1.1.1.3.1 snmpget -v2c -c public <target> CISCO-WAN-CODEC-GEN-PARM-MIB::vismCodecJitterInitialDelay.1
Set instance 1 (SNMPv2c):
snmpset -v2c -c private <target> 1.3.6.1.4.1.351.150.21.1.1.1.1.3.1 i <value>
Start monitoring Cisco VISM WAN switching cards (legacy) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the CISCO-WAN-CODEC-GEN-PARM-MIB::vismCodecJitterInitialDelay OID value, configure state conditions and alerts, and monitor any Cisco VISM WAN switching cards (legacy) from a single console.
OID Breakdown
Upper-level ancestors (8 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| 1.3.6.1.4.1.351 | stratacom | CISCOWAN-SMI |
| 1.3.6.1.4.1.351.150 | ciscoWan | CISCOWAN-SMI |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.351.150.21 | ciscoWanCodecGenParmMIB | CISCO-WAN-CODEC-GEN-PARM-MIB |
| 1.3.6.1.4.1.351.150.21.1 | ciscoWanCodecGenParmMIBObjects | CISCO-WAN-CODEC-GEN-PARM-MIB |
| 1.3.6.1.4.1.351.150.21.1.1 | vismCodecGenParmGrp | CISCO-WAN-CODEC-GEN-PARM-MIB |
| 1.3.6.1.4.1.351.150.21.1.1.1 | vismCodecGenParmTable | CISCO-WAN-CODEC-GEN-PARM-MIB |
| 1.3.6.1.4.1.351.150.21.1.1.1.1 | vismCodecGenParmEntry | CISCO-WAN-CODEC-GEN-PARM-MIB |
| 1.3.6.1.4.1.351.150.21.1.1.1.1.3 | vismCodecJitterInitialDelay | CISCO-WAN-CODEC-GEN-PARM-MIB |