RE ISDN Rates.... The 192K BRI must be an error, right?
BRI = 2b (112K) + 1d (16k) = 128K
US PRI = 23b (1472K) + 1d (64K) = 1536K + 8K framing/overhead = T1 (???)
Eur PRI = 31b (1984K) + 1d (64K) = 2048K (E1)
Way off, or ???
Jim Snow, CCNA
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-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
David Heaton
Sent: Wednesday, March 14, 2001 9:53 PM
To: [EMAIL PROTECTED]
Subject: Re: Cisco1600 ISDN + D channell (& PRI D channel nfas)
router(config-if)#isdn x25 dchannel
allowsd isdn on the d channel for a BRI x25 connection IOS 12.1.2 Desktop
on an e1 PRI ISDN controller you can configure the nfas_d D Channel timeslot
to be backup, primary or 'none' which permits it to be a B channel
which should show up under sh isdn serv as an available channel
never actually done it myself
as for BRI I've never heard of it being don
although you can configure lapb (b channel) variables:
N1 Maximum number of bits per I-frame
N2 Maximum number of attempts to transmit a frame
T1 Retransmission timer
T2 Explicit acknowledge deferral timer
T4 Keepalive timer
interface-outage Interface outage deadband (partial T3)
k Maximum number of outstanding frames (window size)
modulo Set frame numbering modulus
has anyone ever configured these variables, & if so to fix what problems?
also, does anyone know why BRI is represented as 192K total in some books
(I though 2B=2x64 + D =16K)
US PRI = 23B + 2 D how big is D (54K?)
Europe PRI = 30B + D (64K)
what would the carrier use for signalling if the D channel was taken?
Cheer
David
>>> "Brian" <[EMAIL PROTECTED]> 03/15 7:57 am >>>
I saw that there is isdn technology that allows data to pass along the
always up control channel. If I remember correctly, it passes 8k along it.
I do not know how commercially available this is. Only use I could think of
is you could then use it for dial on demand inbound, but do you want that.
Bri
----- Original Message -----
From: "Damien Kelly" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, March 14, 2001 7:10 AM
Subject: FW: Cisco1600 ISDN + D channell
> Just sending this again, No one commented.. was this a stupid question to
> ask?
>
>
>
>
> > Is it true that a cisco can be configured to use the D Channell to
> > remotely bring up an ISDN line on a remote router configured for dial on
> > demand?.
> >
> > I was told sometime ago that a cisco ( also DoD ) could be used to
> > remotely connect to another cisco on a remote network which is on ISDN
> > dialup, using the ISDN D Channell. anyone know if this is true, or
> > possible? anyone have any experience in this?
> >
> >
> > Any suggestions?
> >
> > Thanks
> >
> > Damien Kelly,
> >
> >
>
>
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