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Chapter 3. Terminal Menu Operation and Structure
61200176L3-1 Express 4110/4120 User Manual 3-47
Connection List/PPP
The Express 4110/4120 supports the IETF standards for the Point-to-
Point Protocol. The PPP state machine running in the Express 4110/4120
can be fine-tuned to support many applications that can be employed.
The configurable items under this menu can be changed from their
default values for special cases.
PPP/Multilink
Multilink PPP allows the two B-channels to be used together for
increased bandwidth.
Multilink/Mode
Write security: 3; Read security: 5
When this item is set to On (def), Multilink PPP is negotiated with
the PPP peer. When Off, the Express 4110/4120 will only allow one
B-channel for this connection.
Multilink/Fragment
Write security: 3; Read security: 5
When this item is set to Yes (def), the Express 4110/4120 will split
outgoing packets greater than 128 bytes into two Multilink frag-
ments and simultaneously transmit them one per B-channel. The
receiving PPP peer will then reassemble them. This decreases the
transport delay. However, some legacy equipment might have
trouble handling fragmented packets, in which case this option
should be set to No.
Multilink/BACP
Write security: 3; Read security: 5
The Bandwidth Allocation Control Protocol (BACP) and Band-
width Allocation Protocol (BAP) are used to enhance Multilink PPP.
Together, they allow phone numbers to be exchanged when more
bandwidth is needed and member links to be dropped when band-
width is to be decreased. When this item is set to On, BACP is
negotiated with the PPP peer. When Off, the Express 4110/4120
will not run BACP/BAP but dynamic bandwidth can still be oper-
ated.