NS3000/iX NMMGR Screens Reference Manual - Edition 9 (36922-90040)

48 Chapter3

Link Conﬁguration Screens

Link Conﬁguration: LAP-B Link Data

Local timeout

This is a handshake sequence between the host and its

PSI card. It is useful to prevent the PSI card from

keeping a line up when the system goes down.

Default value: 60

Range: 30–900 seconds or 0 (0 means disabled)

Modulo count

This parameter speciﬁes a window representing the

number of frames that can be outstanding.

Default value: 8

Range: 8 or 128

LAP-B parameter T1

(HP modiﬁable.) Response timeout in hundredths of a

second. This is the maximum amount of time that the

transmitter should wait for an acknowledgment before

initiating a recovery procedure. This delay must

account for three frame transmissions and two

frame-processing delays. An approximation of this

value is three seconds for line speeds greater than or

equal to 9600 bits per second and four seconds for line

speeds less than 9600 bits per second.

The formula for the approximation in hundredths of a

second is the following:

400 x [(buffer size x 8)/line speed]

The conﬁguration validation program will issue a

warning if the set value does not comply to this

speciﬁcation.

Default value: 300

Range: 5 to 1200 hundredths of seconds or 0 (0 means

disabled)

LAP-B parameter K

(HP modiﬁable.) This parameter speciﬁes the

maximum number of sequentially numbered frames

that the conﬁgured node may have unacknowledged at

any given time. This parameter is also called the

Level 2 window size.

Default value: 7

Range: 1–7 if modulo count=8; 1–127 if modulo

count=128