Bridging - ADTRAN Express L128T S User Manual

Chapter 1. Understanding ISDN and the Express L128T S/T
link idle time-out and adding/removing of B-channels based on traf-
fic is initially disabled.

Bridging

In Bridge Mode, the Express L128T S/T can communicate with two re-
mote networks at a time. The destination is dialed by setting up a
Connection List profile and choosing Dial on the Dial menu. See Con-
figuration/Connection List on page 3-36 for instructions on setting up a
Connection List profile.
During a two B-channel PPP Multilink call, the Express L128T S/T au-
tomatically drops one B-channel and provides it to the POTS port
when a telephone call is placed or answered. When a POTS telephone
call terminates, the Express L128T S/T redials the second B-channel
and supplies the bandwidth back to the LAN connection. Since other
bandwidth management features are disabled in the factory default
configuration, the dialed links remain active until the Hang-up com-
mand is entered from the Dial menu, terminating the session with the
selected remote network.
The Connection List described in the next section may be used to au-
tomate dialing and to store additional information specific to the re-
mote site being dialed (phone numbers, number of B-channels to dial,
authentication information, Caller ID, etc.). In addition, to reduce line
charges, Demand Dialing may be enabled to allow idle links to discon-
nect when not being used.
Simple Demand Bridging may be configured by enabling the Idle
Time-Out parameter under the Configuration/ Connection List [1]/
Bandwidth/On Demand option on the Connection List. Setting this
parameter to a non-zero value allows a bridge connection to discon-
nect after the specified number of seconds with no traffic crossing the
ISDN link. Bandwidth can be controlled using the Express L128T S/T's
advanced filtering capability. When new traffic needs to be transmitted,
the Express L128T S/T will run each packet through its Demand filters
defined for each Connection List profile. If a packet can pass through
the filter, then the numbers for that profile are dialed. In addition,
when both B-channels are selected for use, the link may be configured
to add/remove the second B-channel based on the amount of traffic
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