IBM SC30-3681-08 manual Dial Circuits, Using Isdn

Using ISDN

±	The PRI adapter provides T1/J1 or E1 support.
	- T1/J1 supports twenty-three 64-Kbps B-channels and one 64-Kbps
	D-channel.
	- E1 supports thirty 64-Kbps B-channels and one 64-Kbps D-channel.
±	Channelized T1/E1
	- T1/J1 supports up to twenty-four 64-Kbps time slots.
	- E1 supports up to thirty-one 64-Kbps time slots.
	- You can group time slots in 64-Kbps chunks to aggregate bandwidth.

Note: If you are upgrading from BRI to PRI from talk 6, you must clear the ISDN and dial con®gurations ®rst, then bring up PRI and con®gure for PRI.

vThe PRI adapter does not support multipoint.

vThe PRI adapter provides T1/J1 and E1 support.

±T1/J1 supports twenty-three 64-Kbps B-channels and one 64-Kbps D-channel.

±E1 supports thirty 64-Kbps B-channels and one 64-Kbps D-channel.

vThe PRI adapter provides enhanced line ID (LID) support.

Dial Circuits

There are four types of dial circuits:

v Static circuits (or link)

Notes:

1. I.430, I.431, and Channelized T1/E1 are leased line connections and

therefore do not dial.

2. ISDN considers X.25 traffic over the D-channel as a static circuit. However,

you could con®gure the X.25 circuit as a PVC or SVC using the

encapsulator command under the dial circuit con®guration.

v Switched circuits that dial on demand and hang up after a speci®ed idle time

v WAN restoral circuits that are used only when an assigned primary leased line

fails

v Dial-in circuits are used to provide remote clients access to resources on the

network.

When bridging over a dial on demand interface it is recommended that you disable

spanning tree for that interface and create MAC ®lters to ®lter out all undesired

traffic. (The MAC ®lters would drop all frames that are not destined speci®c MAC

addresses.) This keeps the dial circuit from staying connected due to unwanted

traffic.

Note: You don't need to add any MAC ®lters when running BAN traffic on a FR

dial-on-demand interface. The BAN software always performs ®ltering such

that the only bridging traffic that will keep a dial-on-demand circuit from

hanging up is traffic whose destination MAC address matches the BAN DLCI

MAC address.

Add a dial circuit for each potential destination. You can map multiple dial circuits to

one ISDN interface. Each dial circuit is a normal serial line network, running

Point-to-Point Protocol (PPP), Frame Relay or X.25 (for D-channels only). These

protocols are con®gured to operate over the dial circuits.

612MRS V3.2 Software User's Guide