Protocol Specific Configuration

Poll/Select/Option Configuration Values

First Option Word

15

14

13

 

12

11

10

9

 

8

7

6

5

4

3

2

 

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T203 Res

T203/2 Val (0-63)

 

 

 

IUF

LargeK (0-127)

 

 

 

 

 

 

 

 

 

 

 

 

T203 Val

 

This is the value of the T203 Idle line timer divided by two.

 

 

 

 

Setting this field from 1 to 63 translates to T203 timer values of

 

 

 

2 to 126. The units of this timer are given by the T203 Res

 

 

 

 

(resolution) field (see below). If a value of zero is given for both

 

 

 

this field and T203 Res, a default value of approximately

 

 

 

 

T200*N200*100/16 will be used for a user-side terminal. (The

 

 

 

default for a network-side terminal is T203 disabled.) If T203

 

 

 

Res is non-zero but this field is zero, T203 will be disabled.

 

 

 

 

Before configuring T200, you should read the description of

 

 

 

 

timer configuration at the beginning of this section.

 

 

 

 

T203 Res

 

Resolution of T203 Val above. The values correspond as

 

 

 

 

 

follows:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0 = 10 milliseconds

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 = 100 milliseconds

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 = 1 second

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 = 10 second

 

 

 

 

 

 

 

 

 

 

 

 

IUF

 

 

Error handling, normal when 0. This means normal error

 

 

 

 

handling (level 2 link reset) on receipt of unsolicited response

 

 

 

frame with F=1. 1 means Ignore F=1 (treat as F=0) in any

 

 

 

 

unsolicited response frames.

 

 

 

 

 

 

 

 

LargeK

 

Level 2 window size, values 1 to 127. LargeK is only used if K

 

 

 

in the Select Word is 0. It is an error if both K and LargeK are 0.

Chapter 4

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