2503 to multiple ISDN destinations

[masquerade]

I have found a 2503 in the back of a cupboard and want to use it to enable systems on a LAN to connect to remote LANs using Basic Rate ISDN.

Q1: Am I right in assuming that I can set up as many routes as I want? (At least the two I need anyway.)

Q2: Can the two channels operate independantly? In other words can a system talk to LAN1 whie another talks to LAN2? If so, can I configure the router so that if only one call is in progress then the second channel can be bundled (to double the throughput) but, if a second call is required then the second channel is released for that call?

Chris

[cisand2002]

The cisco 2503 has 1 BRI interface.

The Basic Rate Interface consists of two 64 Kbps B-channels and one 16 Kbps D-channel. Thus, a Basic Rate Interface user can have up to 128 Kbps service.

As the D-channel is commun to both B-channels then you can not dial 2 diffrenet destination with 1 BRI interfce at the same time

HTH

Regards,

cisand

[scottmac]

Q1: Yes you can. You define "interesting" traffic with ACLs, which causes the router to dial the number you associate with the traffic.

Q2: Yes you can (to both parts) Each Bearer (B)channel can be defined as an individual dial / circuit-switched path. You also have the option of setting traffic thresholds (high/low) to trigger the addition of a second 'B' (which will be joined with the first, usually with MLPPP) to expand your bandwidth.

At the low threshold, the second channel can be triggered to drop.

It's been a while so, off the top of my head, I don't remember if you could assign a priority to the second channel such that if it was needed for a second call, it can be dropped from a MLPPP group for use as a second channel.

I know that on the old 804, if you had one channel assigned as voice/data, an incoming call would cause the channel to drop it's data role, take the voice call, then resume the data role (if necessary, according to the thresholds).

Good Luck

Scott

[ahpark78]

if wanna create 2 destination from 1 BRI interface,

you can create virtual Dialer (eg dialer0,dialer1) to separate LAN1 and LAN2.

ken G