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Port type, Physical por t i nterface, Bl ocked port flag – Cabletron Systems 1800 User Manual

Page 99: Li ne speed

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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.)