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New Member

ISDN Statistics

I am attempting to gather some statistics on an 192 Kbps ISDN link to prove that it needs to be upgraded. I can use the sh interfaces bri/n command to get snapshots but is there some way I can compile statistics over a period of time?

  • Other Network Infrastructure Subjects
3 REPLIES

Re: ISDN Statistics

You can use an SNMP manager to gather the IfOctetsIn an IfOctetsOut with an interval of one minute or so. This will give you the average bytes in and out per minute or whatever interval you choose.

The more difficult way is to clock the interval and read the interfacecounters manually. After a clear counters, you can read the values after a certain time and calculate an average over that period of time. The first 24 hours after clearing interface counters, the amount of time that has elapsed since the clearing is indicated fairly precise (minutes) In that way you can make a good calculation.

btw: 192kbs for an ISDN link is pretty fast. Where can you get those?

New Member

Re: ISDN Statistics

Thanks for that. I will probably use the manual method.

The 192Kbps is acheived by using 3 64 Kbps B channels.

New Member

Re: ISDN Statistics

I have one question and one solution.

1.Is there some new ISDN standard I haven't been told about?

2.Why does it need to be upgraded? has user performance using this link been affected?

Solution.

If you can: Configure two workstaions with WSFTP PRO on either sides of the ISDN link, prepare or conjure up a file that is approximately 192000 bits in size.

Send the file across the ISDN link.

If your ISDN link is bad then your millisecond time frame will be uneven on both sides of the link.

Check with your local DNC to check if the link is receiving errors on their ISDN TA-1,if there are frames being dropped or low performance on the DNC side, have the circuit diapatched. It is cheaper to have a circuit dispatched than to find out it cost more to be upgraded.

Or you can debug.

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