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Configuring SDLC Services

2-2 114053 Rev. A

Chapter 3 describes how to complete the SDLC Line Parameters. To view or

change synchronous line parameters that do not appear in the SDLC Line

Parameters window, edit the line parameters of the desired circuit. For

information on editing other synchronous line parameters, refer to Conﬁguring

Line Services.

SDLC Timers

SDLC uses timers to manage trafﬁc over SDLC links. You should edit the timer

values whenever you adjust the speed of the line. If you conﬁgure SDLC on a link

with a slow baud rate, the default values for SDLC timer parameters may not be

adequate for the line.

For example, if you are using a line with a 4800 baud rate, increase the REPLYTO

Timer parameter value in the SDLC Link Station Conﬁguration window (refer to

Figure 4-4) to 60 tenths of a second. Edit the REPLYTO Timer value whenever

you adjust baud rate with the Internal Clock Speed parameter or the external

modem baud rate.

Conﬁgurable Window Size

In SDLC, a window controls how many frames a link station sends before

receiving an acknowledgment. Window size depends on which modulo your

network’s implementation of SDLC uses. Modulo 8 operation allows a maximum

window size of 7; Modulo 128, a maximum of 127.

For example, with a window size of 7, a link station can transmit frames 0 through

6 before requiring acknowledgment from the receiving station. The sending

station will not send more frames until it receives an acknowledgment.

You edit this window size with the MAXOUT parameter, described in Chapter 4.

Note: The BOFL (Breath of Life) parameter enables proprietary BOFL

messages to travel over a point-to-point connection between the local router

and a remote peer. If this parameter is enabled, set it to Disable so that these

messages do not interfere with SDLC frames.

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Avaya Configuring SDLC Services Bedienungsanleitung Seite 32