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Intrepretation of the Output

Dear NetPros,

Could someone tell me the significance of pl, lost,delay,noise,acom,i/0 in the output displayed below. How does each contribute towards the quality of the call or how does the variation in each affect the voice quality??

*****************************************************

1E8C : 448067645hs.1 +1368 pid:0 Answer 20204000 active

dur 00:07:39 tx:20931/412407 rx:7617/296698

IP xx.xx.xx.xx:18188 rtt:709ms pl:272000/60ms lost:5/70/3 delay:70/60/130ms g72

9r8

1E8C : 448067646hs.1 +1367 pid:9 Originate 0205634779 active

dur 00:07:39 tx:7617/52186 rx:20931/656919

Tele 3/0:1 (251083): tx:464580/263000/0ms g729r8 noise:-60 acom:90 i/0:-13/-37

dBm

*****************************************************

Thanx

Rushabh

1 REPLY
Cisco Employee

Re: Intrepretation of the Output

Rushabh,

A good starting point to answer some of your questions would be the following link.

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a008019ab88.shtml

Generally speaking here are some pointers to how these values reflect on voice quality.

pl:272000/60ms

What these two numbers are tellihg you is that we have played out 2720000 milliseconds worth of voice and during that 60 msecs needed to be fudged using the codecs tools such as predicting what the next packet should have been (when one gets lost) In your case this only happened 3 times during the duration of the call. If the gap number (60ms) continuously increases, that could be an indication of voice quality issues.

lost:5/70/3

The first number indicates lost packets, second is early packets, and the last field are late packets.

Lost packets can severely affect voice quality especially if consective packets get lost. If this number is incrementing at a high rate, you are guaranteed to have poor voice quality. Early packets are not as bad, but it can be an early indicator of jitter in your network. The same goes for late packets. A rapid increase in any of these numbers has a negative effect on voice quality.

delay:70/60/130ms

These numbers capture the state of the jitter buffer. The last two numbers are in essence your high and low water mark of your jitter buffer. The first number is the delay on the last packet received. These numbers can give you a sense of jitter in your network.

noise:-60 acom:90

I let you read the link above on noise and acom, but they can be used to troubleshoot echo problems

the i/o values simply tell you the level of audio for that voice call. input is the sound level in decibels coming into the router, and output level is the level that the router is sending out.

Hope this helps.

Ademola

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