Adtran L128 用户手册

Chapter 3: Terminal Menu Operation and Structure

Express L128/L128T User Manual

61202.070L1-1

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The Bandwidth Allocation Control Protocol (BACP) and Bandwidth Alloca-
tion Protocol (BAP) are used to enhance Multilink PPP.  Together, they allow 
phone numbers to be exchanged when more bandwidth is needed and mem-
ber links to be dropped when bandwidth is to be decreased.  When this item 
is set to On, BACP is negotiated with the PPP peer.  When Off, the Express 
L128/L128T will not run BACP/BAP but dynamic bandwidth can still be op-
erated.

Certain rules for bandwidth-on-demand apply, depending on whether BACP 
is negotiated. If BACP is not negotiated, the originator of the call will perform 
the dynamic bandwidth adjustments on its own. If BACP is negotiated, the de-
cisions are made on either side but the call is always from the originator.

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The Express L128/L128T uses LZS

® 

technology from hi/fn

TM

 

(formerly known 

as STAC) for data compression.  The Ascend Communications version of this 
compression is also supported.  The Express L128/L128T will automatically 
select the type of compression.  Compression is negotiated when this item is 
set to STAC (def).  No compression will be attempted when set to None.

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When this item is set to On, the Express L128/L128T will perform TCP/IP 
header compression known as Van Jacobson compression to the PPP peer.  
Normally, this is not necessary over ISDN connections and can be set to Off 
(def) to disable it.

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This value is the number of unanswered configuration-requests that should be 
transmitted before giving up on a call.  The possible values are 5, 10 (def), 15 
and 20.