Cabletron Systems MMAC-Plus 9F116-01, User Manual, Page: 186 / 420

9-12 FRX/FRM 3. 3 User G uide, Rev 04
V.35, RS-449, and X.21
. (RS-449, RS-530, and X.21 i
nterfaces require an RS-422
LIC. Also, RS-530 and X.21 are available through special order only.)
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 for an FRX4000
DSU
port will toggle between the two valid
values of
56K bps
and
64K Clear Channel
. Selecting this parameter for any port type
except FRX4000
DSU
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.)
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
(see that entry) 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.
Maximum Bytes per Frame
is the maximum frame size that will be transmitted on the port.