Re: Hughes 7100 sat phone - AD command set?

<occassionally-confused@nospam.co.uk> wrote in message
news:b4na44997lljie1uejeo5ad9npjn8st8go@4ax.com...
> Hi All,
>
> I am successfully using this phone as a dial-up modem with a laptop,
> at 9.6k, dialling up a normal UK ISP (0845..).
>
> However, the connection takes 45-60 secs to establish and most of this
> is probably the modem negotiation time. I am sure the ISP starts off
> at 56k...
>
> Voice calls connect in about 5 seconds.
>
> Can anyone suggest anything to cut down this connection time?
> Historically, Hayes compatible modems had various AT commands to force
> a connection only at a certain speed.
>
> I cannot find the Hughes 7100 programming data anywhere. The network
> is Thuraya.
>
> Thank you in advance for any tips.

You can cut out the attempts to train at 56k, but then you will be running
at lower speed.

Peter wrote:
> NTW I did another test today and a voice connection takes 25 secs so
> maybe my 45 secs (which includes the ISP authentication) is not so
> bad...

But could be zero :-)

Ask your ISP technical department about v.110. Their modem racks may
support it on the same dial-in number...

--
Adrian C

occassionally-confused@nospam.co.uk wrote:
> Adrian C <email@here.invalid> wrote:
>
>> Ask your ISP technical department about v.110. Their modem racks may
>> support it on the same dial-in number...
>
> OK, I've done more tests
>
> Voice calls start to ring after 25 secs.
>
> Watching the windoze dial-up dialogue carefully, I see the
> "authenticating" message after about 25 secs too. One would not see
> this if the modems were still negotiating, would one?
>

Think you are correct, the training is over by then. I've never used a
satellite phone and am scarily wondering how much extra these seconds
would be costing you.

> So I reckon the extra 20 secs are actually spent on authentication
> (login/pwd) and of course DHCP.
>

It's not DHCP on a PPP connection but something called IPCP (IP Control
Protocol). Still does the same thing for you, it hands you an IP address
for the connection which has to be within the ISP's chosen subnet of
user connections.

I wonder if I can avoid the DHCP step. Can one connect a laptop with
> some invented fixed private-range IP (say 192.168.1.1) directly to an
> ISP? I realise I would have to also configure a nameserver IP for the
> laptop to use.

You could ask your ISP for a static IP address?

>
> One can get "GPRS" on Thuraya but only with the SG phones which have
> fancy features, colour screens, and zero battery life.
>
> Presumably, the billing on a voice call doesn't start until the
> ringing starts, yes?

Hmmm... I'd hope so, but no idea...

> Another thing is this: there should be NO modem negotiation since the
> calls is a DATA call. An old-style analog modem call is a VOICE call
> and the modems negotiate the best speed on a VOICE line. That's why
> the negotiation is required. ISDN gets away from this and no
> negotiation is involved. I am sure satellite DATA calls are like ISDN.

AIUI The information may reach across the GSM connection as DATA, but
the training actually is happening between the telephone network's
interface from GSM to analogue VOICE, and the other modem. Your handset
plays no part in this, it doesn't have the analogue trickery in it, but
for compatibility with the other end this must go on unless knobbled
with the ISDN setting.

Table of connection times over GSM for data traffic.
<http://www.tdc.co.uk/technical/downloads/faq/faq-05-01.pdf>

--
Adrian C