Cabletron Systems FRM User Manual - page 132
9-8
Frame Relay Module 4. 0 User G uide, Rev 01
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.
Selecting this parameter will display a list of ranges. Press the letter corresponding to
a range to display the valid speeds within that range. All possible speeds are:
75
150
300
600
1200
2400
4800
9600
14.4K
19.2K
24K
28.8K
38.4K
48K
56K
64K
72K
112K
128K
168K
192K
224K
256K
280K
320K
336K
384K
392K
448K
504K
512K
560K
576K
616K
640K
672K
704K
728K
768K
784K
832K
840K
896K
952K
960K
1.008M
1.024M
1.064M
1.088M
1.12M
1.152M
1.176M
1.216M
1.232M
1.28M
1.288M
1.344M
1.4M
1.408M
1.456M
1.472M
1.512M
1.536M
1.568M
1.6M
1.624M
1.664M
1.668M
1.728M
1.792M
1.856M
1.92M
1.984M
2.048M
If an RS-232 DCE port is directly connected to the DTE via the standard
Cabletron cable, the maximum supported speed is 64K. If longer cabling is
used, the maximum speed is 19.2K. (The EIA standard for RS-232
addresses speeds up to 19.2 Kbps.)
No Data Poll Period
is the time between polls by this TPAD port of its PU (physical unit) when the PU has
no data to send. This parameter has no relevance on an HPAD port.
No Resp Poll Period
is the time between polls by this TPAD port of its PU when the PU is not responding.
The TPAD will continue to poll at this interval up to the number of times specified by
Maximum Retransmissions
. This parameter has no relevance on an HPAD port.
Maximum Retransmissions
is the maximum number of times the port will attempt to send a frame if the PU is not
responding. A larger value increases the probability of an eventual correct transfer
between DTE and DCE, but a smaller value permits faster detection of a permanent
error condition.