Ascend Archive
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Re: (ASCEND) shared D-Channels on PRI
On Tue, 13 Oct 1998 23:04:23 -0500 (CDT) Joe Shaw said:
>It does not work across chasis. You must have at least one D channel per
>group of PRI's coming into a MAX. So if you split 9 PRI's between 3
>MAXEN, you'd get 3 PRI's with D channel signaling; one/box.
>Then you'd have 6 other PRI with 24B channels, so in reality you'd free up
>6 channels. Unfortunately, if you lose any of those signaling trunks,
>you're out at least 3 PRI. NFAS is great for units like the TNT, but with
>a MAX, the gains are minimal.
>
>>On Tue, 13 Oct 1998, System Administrator wrote:
>> you can share D-channels between PRIs with use of NFAS. give each PRI
>> an NFAS id. Configure your 1 PRI as 23 switched+D and the other as 24
>> switched.
>> Now if you can do it across chassises, i dont know, you would have to try.
Related to this, I had a 3com vendor tell me yesterday that NFAS was a
BAD thing, that above 1 PRI's worth of ISDN calls, that performance
would drop off, both for call setup and throughput. He also claimed
that this was true for all equipment including Ascend MAXs.
My first thought was to politely tell him how wrong he was, and then
realized that I didn't have enough real world data to form an opinion.
So, assuming that with standard PRI's in MAX boxes the call setup time
is "X", and the average link throughput is "Y"; how are these values
effected when using NFAS for 2PRIs? 3 PRIs? 4 PRIs?
Also are these values effected by wheither or not the PRIs are
terminated in 1 chassis or multiple chassis? Is there an effect
that can be tied to type of calls, Modem vs. ISDN?
Thanks
John
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John T. Farmer Proprietor, GoldSword Systems
jfarmer@goldsword.com Public Internet Access in East Tennessee
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