[cisco-nas] Modem negotiation time

[Aaron Leonard]

Normally (ideally), GSM traffic will be transported thru
the PSTN as V.110.  If you can do things this way, the 
calls will come up within a couple of seconds.

If you need to carry the GSM traffic as an analog modulation,
(which you would need to do, for example, if your 5300 is connected to the
PSTN via R2 rather than ISDN), then you'll probably want to use 
V.32/V.32bis.  To minimize training time in V.32/V.32bis, use this
modemcap (assumes 2.9.4.0 portware):

&F&D2S0=0S29=3S53=0S54=32968
  S0=0  Do not delay answerback tone (CSCdw05174)
  S29=3 Top modulation V.32bis
  S53=0 No V.8bis
  S54=32968 Default value + 32768 (save 400ms - CSCdw05174)

If the calls aren't using error control, then disable it.
(S15=0S23=0S24=0).

Include "show modem operational-status <slot>/<port>" on a call
so that we can see what exactly the GSM call is using.

Aaron

---

> Please turn on millisecond timestamps and then get the output of
> "Debug isdn q931", "debug csm modem", "debug modem", "debug ppp negot"
> and "debug radius". This will tell us where the slowness is being
> introduced and allow us to try things to tune it.

> Dennis

> Oyundalai.N [oyundalai at mail.mobicom.mn] wrote:
> > hello all.
> >
> > We use 5300 to accept calls from GSM mobile WAP terminals. Connection speed
> > is 9600bit/s. Negotiation duration is about 40 second. How to decrease this
> > time. I would like 5-10 second if possible.
> >
> > dalai.
> >
> >
> >
> > _______________________________________________
> > cisco-nas mailing list
> > cisco-nas at puck.nether.net
> > http://puck.nether.net/mailman/listinfo/cisco-nas

> --
> -------------------------------------------------------------------------
>       ||        ||                                 Dennis Peng
>       ||        ||        Cisco Systems, Inc.      Escalation Engineer
>      ||||      ||||       170 West Tasman Drive    Phone: (408) 526-6143
>  ..:||||||:..:||||||:..   San Jose, CA 95134       Fax:   (408) 232-2343
>    Cisco Systems Inc.                              dpeng at cisco.com
> -------------------------------------------------------------------------
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