Cingular CSD roaming off GSM?

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dave martin - 20 Aug 2004 03:32 GMT

A Cingular CS rep told me that CSD roaming OFF Cingular/partner GSM is
not allowed; i.e. no CSD on Cingular/partner TDMA or analog.

Is there any evidence against this?

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dave martin - 23 Aug 2004 02:58 GMT

> A Cingular CS rep told me that CSD roaming OFF Cingular/partner GSM is
> not allowed; i.e. no CSD on Cingular/partner TDMA or analog.
>
> Is there any evidence against this?

I've communicated with a guy who says he's able to do CSD on Cingular
TDMA and AMPS using an older tri-mode Nokia phone and an Ositech King
of Clubs card.

This, combined with Cingular's GSM/GPRS is probably the best cellular
coverage available don't you think?

Dave

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John Navas - 23 Aug 2004 06:35 GMT

>I've communicated with a guy who says he's able to do CSD on Cingular
>TDMA and AMPS using an older tri-mode Nokia phone and an Ositech King
>of Clubs card.

Just AMPS, not TDMA.

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Best regards, HELP FOR CINGULAR GSM & SONY ERICSSON PHONES:
John Navas <http://navasgrp.home.att.net/#Cingular

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dave martin - 23 Aug 2004 14:56 GMT

> [POSTED TO alt.cellular.cingular - REPLY ON USENET PLEASE]
>
[quoted text clipped - 4 lines]
>
> Just AMPS, not TDMA.

Thanks John. He really wasn't sure which he was using because the KoC
autoswitches. Is CSD blocked on Cingular TDMA?

Dave

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Jud Hardcastle - 23 Aug 2004 23:50 GMT

> > [POSTED TO alt.cellular.cingular - REPLY ON USENET PLEASE]
> >
[quoted text clipped - 9 lines]
>
> Dave

No, CSD works fine on home area Cingular TDMA, both pure TDMA and GAIT,
but I've never seen it work while roaming on a non-Cingular carrier.

Not familar with the KOC card but if it's like other cellular-ready
pccards it probably doesn't use CSD at all. They contain(ed) a real
analog modem and auto-switched the phone into AMPS when the data call
connected--either to a private modem or to a modem pool at the carrier.
I used several of those over the years. I believe CSD, circuit switched
data, is purely a digital thing.

Well, after looking at the Ositech site I'm not sure what it does.
Appears to have hardware to support both--analog modem when on AMPS and
CSD adapter/interface when on digital. Interesting.

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Jud
Dallas TX USA

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John Navas - 24 Aug 2004 01:32 GMT

>>
>> >I've communicated with a guy who says he's able to do CSD on Cingular
[quoted text clipped - 5 lines]
>Thanks John. He really wasn't sure which he was using because the KoC
>autoswitches. Is CSD blocked on Cingular TDMA?

The Ositech King of Clubs is based on the Trumpcard cellular modem, which
works only over AMSP. For digital (TDMA, GSM, whatever), there is no actual
modem per se, and thus Ositech isn't needed at all, claims for its silly
CellFlex(tm) technology notwithstanding.

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Best regards, HELP FOR CINGULAR GSM & SONY ERICSSON PHONES:
John Navas <http://navasgrp.home.att.net/#Cingular

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dave martin - 24 Aug 2004 15:08 GMT

Putting all of the above together it appears that Cingular blocks CSD
outside the home area, but does not block using AMPS for data.

This is consistent with the above info and with the fact that Cingular
offers no phone that can be forced into AMPS mode (I've been told by
the Ositech people - presumably to discourage the use of AMPS.)

It also means that one can get very broad data coverage on Cingular by
buying an old phone that can be forced into analog on ebay for use on
AMPS when desired. Magicbus reports 14.4 kbps with an Ositech King of
Clubs on AMPS which is a lot better than no data coverage at all.

Dave

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John Navas - 24 Aug 2004 16:32 GMT

>Putting all of the above together it appears that Cingular blocks CSD
>outside the home area, but does not block using AMPS for data.
[quoted text clipped - 7 lines]
>AMPS when desired. Magicbus reports 14.4 kbps with an Ositech King of
>Clubs on AMPS which is a lot better than no data coverage at all.

You may port connect at 14.4 Kbps, but I doubt that you're actually getting
that kind of throughput, probably more in the range of 4.8 - 9.6+ Kbps.

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Best regards, HELP FOR CINGULAR GSM & SONY ERICSSON PHONES:
John Navas <http://navasgrp.home.att.net/#Cingular

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dave martin - 25 Aug 2004 03:13 GMT

> [POSTED TO alt.cellular.cingular - REPLY ON USENET PLEASE]
>
[quoted text clipped - 12 lines]
> You may port connect at 14.4 Kbps, but I doubt that you're actually getting
> that kind of throughput, probably more in the range of 4.8 - 9.6+ Kbps.

I use an old bagphone for AMPS and get less than 2400 baud. 9.6 sounds
dreamy! Certainly MUC better than zero!

It appears that Cingular's GAIT nationwide plans include AMPS minutes
in unlimited nights and weekends. If so, cingular would be the most
cost effective carrier for really broad data coverage.

In my opinion "effective data coverage" requires long connect times
but little actual traffic. Trying to work off-line has never been
successful for me; I like to read a message then respond in real time
(most of the time is spent thinking and typing slowly!)

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John Navas - 25 Aug 2004 04:51 GMT

>It appears that Cingular's GAIT nationwide plans include AMPS minutes
>in unlimited nights and weekends. If so, cingular would be the most
[quoted text clipped - 4 lines]
>successful for me; I like to read a message then respond in real time
>(most of the time is spent thinking and typing slowly!)

That's what GPRS is good for, since you're not charged for connect, only
actual data traffic.

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Best regards, HELP FOR CINGULAR GSM & SONY ERICSSON PHONES:
John Navas <http://navasgrp.home.att.net/#Cingular

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