ADTRAN 1204006L1 Manual do Utilizador descarregar pdf (Página 70)

54 FSU 5622 ESP User Manual 61200.175L1-1

Chapter 6. DTE Port Configuration

Edit Previous Entry (PREV key on front panel)

Edit the previous entry in the address table.

Delete This Entry (DEL key on front panel)

Delete the current entry in the address table.

Add New Entry (ADD key on front panel)

Add a new entry to the address table.

There should be one entry for every virtual circuit on the frame relay

DTE port.

SDLC Protocol

SDLC is a synchronous, bit-oriented, full-duplex, Layer 2

protocol used to connect SDLC devices to a frame relay network.

At Layer 2, SNA networks use SDLC between FEPs (front-end

processors) and cluster controllers. This protocol selection

provides Logical Link Control Type 2 (LLC2). LLC2 defines the

data link frame header and supports the multiplexing of one or

more data links to/from separate service access points (SAPs).

Type 2 provides acknowledged, connection-oriented service. See

Figure 6-5.

The PU (physical unit) address, LLC2 SSAP, LLC2 DSAP, and

outgoing DLCI are used to set up an end-to-end SDLC session

for each PU in the network. The PU address elements should

match the address of each controller address attached to the port.

The DLCI determines the path across the frame relay network

and is given by the service provider. The SSAP/DSAP pairs are

user-defined but should match between two FSU 5622 ESPs for

each SDLC session.

All PU addresses for a port must be unique, but it is not necessary that

they match the PU address at the remote end. The SSAP/DSAP/DLCI

is used to make the connection across the frame relay network.

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ADTRAN 1204006L1 Manual do Utilizador Página 70