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 FSUs 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.
