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Guest · Posted: Mon Jul 31, 2006 2:32 am Post subject: V.90 signaling

Anyone know how to force a modem to use V.90 signaling?

Thanks.

mdp · Guest

Guest · Posted: Mon Jul 31, 2006 4:58 am Post subject: Re: V.90 signaling

Creative DI5630

mdp wrote:

Aaron Leonard · Guest

You can't "force a modem to use V.90 signaling". If your
circuit can't do V.90 (for example, because it contains
two codecs), then you CAN'T use V.90.

Aaron

---

~ Anyone know how to force a modem to use V.90 signaling?
~
~ Thanks.

Guest · Posted: Tue Aug 01, 2006 9:43 am Post subject: Re: V.90 signaling

I have a telephone line simulator, so there are no codecs. I should be
able to force it.

Aaron Leonard wrote:

Aaron Leonard · Guest

Bob,

Not only can you not do V.90 on a two-codec circuit, you can't do it on
a ZERO-codec circuit either. You need exactly ONE codec in your circuit.

In more detail, here's what you need, in order to do V.90:

[analog V.90 modem]--two-wire line--[G.711 codec]--64K PCM--[V.90 digital modem]

Here's a prettier picture of a typical network diagram:

http://www.cisco.com/warp/public/76/modem-macro.html#topic1

One relatively simple setup to achieve a V.90 connection in lab will typically
involve using a channel bank:

[analog modem]--two-wire line--[channel bank]--channelized T1--[digital modem]

Regards,

Aaron

---

~ I have a telephone line simulator, so there are no codecs. I should be
~ able to force it.
~
~ Aaron Leonard wrote:
~ > You can't "force a modem to use V.90 signaling". If your
~ > circuit can't do V.90 (for example, because it contains
~ > two codecs), then you CAN'T use V.90.
~ >
~ > Aaron
~ >
~ > ---
~ >
~ > ~ Anyone know how to force a modem to use V.90 signaling?
~ > ~
~ > ~ Thanks.