Avaya Configuring Line Services Bedienungsanleitung Seite 53

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About Line Protocols
114078 Rev. A 2-17
Link Access Procedure Balanced (LAPB) Protocol Overview
The Link Access Procedure Balanced (LAPB) protocol is a version of the
High-level Data Link Control (HDLC) protocol, which is an OSI link layer
standard. Bay Networks routers use the services of LAPB to initialize the link
between the router and the local DCE device, and to frame X.25 data packets
before transmitting them to the DCE.
X.25 uses the LAPB protocol at the data link layer to
Initialize the link between the DTE and the local DCE device
Frame X.25 data packets before transmitting them to the DCE
The LAPB information field contains the X.25 packets. Once an X.25 packet
reaches the destination router, the LAPB protocol strips away the LAPB frame
and delivers the packet to the network layer for further processing. For detailed
information on X.25, refer to Configuring X.25 Services.
LAPB Implementation on Bay Networks Routers
When you configure X.25 on a Bay Networks AN® or ASN™ router, or on an
Octal Sync link module line, Site Manager automatically configures LAPB.
The implementation of the LAPB protocol on the AN and ASN routers, and on
BN® and LN® routers with Octal Sync, differs from that on other Bay Networks
routers. On the AN and ASN routers and BN and LN routers with Octal Sync,
LAPB is implemented in software in routers that use the QUICC 68360 driver. On
the other routers, LAPB is implemented in the hardware using the MK5025 chip.
MCE1 and MCT1 Overview
Multichannel E1 (MCE1) and T1 (MCT1) interfaces provide high-density access
to digital access and crossconnect systems (DACS). MCE1 also provides a variety
of international PTT and Telecommunications Administration services.
Multichannel interfaces enable data to be segmented into multiple DS-0
connections. This allows you to maximizes remote link capacity by allowing
individual DS-0 channels to be used separately or grouped. You can form
Fractional T1 channels by grouping MCT1 DS-0s.
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