Adtran L128 用户手册
Chapter 1: Understanding ISDN and the Express L128/L128T
61202.070L1-1
Express L128/L128T User Manual
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Bridging
In Bridge Mode, the Express L128/L128T can communicate with two remote
networks at a time. The destination is dialed by setting up a Connection List
profile and choosing Dial on the Dial menu. See Configuration/Connection List
on page 63 for instructions on setting up a Connection List profile.
networks at a time. The destination is dialed by setting up a Connection List
profile and choosing Dial on the Dial menu. See Configuration/Connection List
on page 63 for instructions on setting up a Connection List profile.
During a two B-channel PPP Multilink call, the Express L128T automatically
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 L128
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
command is entered from the Dial menu, terminating the session with the se-
lected remote network.
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 L128
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
command is entered from the Dial menu, terminating the session with the se-
lected remote network.
The Connection List described in the next section may be used to automate di-
aling and to store additional information specific to the remote site being di-
aled (phone numbers, number of B-channels to dial, authentication
information, Caller ID, etc.). In addition, to reduce line charges, Demand Di-
aling may be enabled to allow idle links to disconnect when not being used .
aling and to store additional information specific to the remote site being di-
aled (phone numbers, number of B-channels to dial, authentication
information, Caller ID, etc.). In addition, to reduce line charges, Demand Di-
aling may be enabled to allow idle links to disconnect 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 De-
mand
parameter under the Configuration/ Connection List [1]/Bandwidth/On De-
mand
option on the Connection List. Setting this parameter to a non-zero val-
ue allows a bridge connection to disconnect after the specified number of
seconds with no traffic crossing the ISDN link. Bandwidth can be controlled
using the Express L128/L128T’s advanced filtering capability. When new traf-
fic needs to be transmitted, the Express L128/L128T 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 ad-
dition, 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 crossing
the link. The bridged connection is terminated when the Hang-up option is
selected from the Dial menu, but will redial if the demand filter condition is
met.
seconds with no traffic crossing the ISDN link. Bandwidth can be controlled
using the Express L128/L128T’s advanced filtering capability. When new traf-
fic needs to be transmitted, the Express L128/L128T 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 ad-
dition, 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 crossing
the link. The bridged connection is terminated when the Hang-up option is
selected from the Dial menu, but will redial if the demand filter condition is
met.