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

42 Chapter3

Link Conﬁguration Screens

Link Conﬁguration: LAPBMUX Link Data

Select the right modem type or 0 for leased/direct line.

Max receive bytes

Layer 3 through 7 frame size. This is the amount of

data that a user of OSI Levels 3 through 7 can put in

that frame. It does not include Level 2 header or trailer

information. This parameter is used to conﬁgure

memory buffers.

Default value: 1024

Range: 1024–4096 Bytes

Response timer T1:

Response timeout in milliseconds. 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 the speeds greater than

or equal to 9600 bits per second and four seconds for

line speeds less than 9600 bits per second.

The conﬁguration validation program will issue a

warning if the set value does not comply to this

speciﬁcation.

Default value: 3000

Range: 3000 to 1260000ms

Speed

This is the line-transmission speed in bits per second. It

may be overridden by whichever device is providing

clocking. The MUX card simply transmits using the

provided clock source, whether it is the HP e3000’s

CPU clock or a modem.

Default value: 56000 bits/second

Range: 1200–2048000 bits/second

Retry count N2:

This ﬁeld speciﬁes the maximum number of times to

retransmit a frame if the T1 timer expires. The

recovery procedure mentioned in LAPBMUX

parameter T1 usually refers to the retransmission of

the oldest unacknowledged frame. The value of N2

speciﬁes the total number of times that the T1 timer

expires and a frame is retransmitted in determining

that the other side is not responding.