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Configuring X.25 8-7
4
If SDLC-LLC2 conversion is configured over the port,
Fast Select Acceptance
must be
Y
. Also, if the X.25 link is to an X.25 network, the network must support Fast Select as
well as call user data greater than 32 bytes.
Port Type
specifies the protocol the port will support. Selecting this parameter will display a list
of all serial protocols loaded in the device.
Physical Port Interface
must be configured as follows. For reference, port locations are shown on page 6-1.
●
Port 0 is always
RS-232
.
●
Port 1 is
RS-232
or
DSU
, depending on whether the optional CSU/DSU card is
installed.
●
Ports 2 and 3 are determined by the attached cables:
RS-232
,
V.35
, or
RS-449
.
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 a CSU/DSU port will toggle between the two valid values
of
56K bps
and
64K Clear Channel
.
Selecting this parameter for any other physical interface type 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.)