46 FSU User Manual 61200.130L1-1
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 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.