DLSw Configuration Overview
3-13
• Clock Source
Use this parameter when connecting the SNA equipment directly to the router.
Either the router or the SNA equipment can define the speed of the SDLC
link. You must configure one device to internal clocking, and the other device
to external clocking. The Clock Source parameter identifies whether the
router provides clocking (INTERNAL) or receives clocking (EXTERNAL)
from the other device.
When connected to a modem, set this parameter to EXTERNAL. The attached
modem provides the clocking for the connection.
• Internal Clock Speed
Use this parameter to specify the speed of the line. It is relevant only when
“Clock Source” is set to INTERNAL.
Attached devices must be capable of operating at the specified speed. Some
of the more common allowed speeds for IBM products are as follows:
— An IBM 3274 with an V.24/RS-232 interface supports up to 9600 bps.
Later models support speeds up to 19200 bps.
— An IBM 3274 with a V.35 interface supports up to 56 Kb/s.
— An IBM 3174 with a V.24/RS-232 interface supports up to 19200 bps.
— An IBM 3174 with a V.35 interface and running Licensed Internal
Code-C supports up to 256 Kb/s.
• Sync Line Coding
Use this parameter to set the same line coding value for all devices attached to
the same SDLC link. The network administrator can define the line coding for
most SNA control units.
The Sync Line Coding parameter does not operate with the Bay Networks
AFN® and the Quad Sync module.
For information on configuring the SDLC line parameters, refer to Chapter 4.
Note: When connecting the router directly to an SNA endstation, the cables
connecting these devices must connect the “transmit” pins of one device to the
“receive” pins of the other. Typically, a DCE cable for the SNA equipment is
connected to a Bay Networks Synchronous Passthrough cable. Conversely, an
SNA DTE cable connects to a Bay Networks modem cable.
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