Cabletron Systems FRM User Manual - page 159
Configuring BSC Interact ive
10-5
1
If the TPAD is connecting to a logical X.25 port in the FRM,
Atcl
must be
Y
.
Explanations of Port Parameters
Port Type
defines the protocol the port will support. Selecting this parameter will display a list
of valid protocols. (Protocol configuration is described in
Chapter 5
.)
Physical Port Interface
is determined by the Line Interface Card(s) and attached cables. The RLP record iden-
tifies the LIC, and only the valid interfaces will be displayed on the Port screen,
among:
RS-232, V.35, RS-449
, and
X.21
.
(RS-449 and X.21 interfaces are valid if the
LIC is RS-422.)
Blocked Port Flag
will cause the port to be enabled (
N
) or disabled (
Y
) at node IPL. The port will remain
in that state until this parameter is changed or an on-line enable (
[B], [B], [C]
from the
Main Menu) or disable (
[B], [B], [A]
from the Main Menu) is performed.
Line Speed
is the data transmission rate in bits per second, and the clock speed on a serial port
when the port is a physical DCE (i.e., the attached I/O cable is DCE). If this port is a
physical DTE, specify the line speed that matches (as closely as possible) that of the
device connected directly to the port.
Retransmission Period
is the length of time before the node will transmit an I-frame if the previous trans-
mission is not acknowledged. If the period expires, the timer will be reset and a super-
visory frame will be transmitted demanding immediate acknowledgement. The
Maximum Retransmissions
counter will also be incremented.
The default value of
2000 ms
allows avoidance of unnecessary retransmission of
frames that have merely been delayed.
Maximum Retransmissions
is the maximum number of times the node will attempt to send an I-frame after a
Retransmission Period
expiration. A larger value for this parameter increases the prob-
ability of an eventual successful transmission, but a smaller value permits faster
detection of a permanent error condition.
Table 10-2 BSC Interactive Port Subscriber Parameters
Parameter
Valid Values
Default Value
Sq
(Sequence)
1–16
none
Local Sub
0–15 characters
none
Remote Sub
0–15 characters
none
Atcl
(Autocall)
Y/ N
(used only on TPAD)
1
N
Rtytm
(Retry Timer) (sec)
15–255
60
Rty#
(Retry Number)
0–255
0
(indefinite)
Conn ID
00–ff
none