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Cabling the Connectors 1-7
Cabling the Serial
Connectors
The serial connectors provide the following options:
■ The UNIVERSAL connector can be converted to a V.35, V.36, X.21,
RS-449, or RS-232 connector.
■ All serial connectors can function in either DTE or DCE-like mode,
which allows you to connect a serial connector to either a CSU/DSU
device or modem (DTE mode), or to an IBM cluster controller
(DCE-like mode). A connection to an IBM cluster controller must be
made using a permanent leased line only. You can operate the serial
connectors in any combination of DTE and DCE-like modes.
The cables you use determine the serial connector function. Table 1-2
lists the types of devices available for serial connections, cable options
for connection to each device, and if the cable is sold by 3Com. Cables
used for IBM cluster controller connectivity (DCE-like mode) are referred
to as direct connect cables.
* If you cable the UNIVERSAL connector, you need to perform some software configuration. For more information, refer to the
software guide.
Table 1-2 Serial Connector Cabling Information
Connection to Connector
*
Connector
Mode
Cable Name Sold by 3Com?
V.35 CSU/DSU device or
modem
V.35 DTE V.35 to V.35 DCE cable No. Easily obtained from
cable manufacturer.
V.35 CSU/DSU device or
modem
UNIVERSAL DTE V.35 adapter cable Yes (3C8035).
V.35 IBM cluster controller V.35 DCE-like V.35 to V.35 direct connect
cable
No. See Chapter 2 for
pin assignments.
V.35 IBM cluster controller UNIVERSAL DCE-like UNIVERSAL to V.35 direct
connect cable
Yes (3C8135).
X.21 CSU/DSU device or
modem
UNIVERSAL DTE X.21 adapter cable Yes (3C8021).
RS-449 or V.36 CSU/DSU
device or modem
UNIVERSAL DTE UNIVERSAL to RS-449/V.36
DCE cable
No. See Chapter 2 for
pin assignments.
RS-449 or V.36 IBM cluster
controller
UNIVERSAL DCE-like UNIVERSAL to RS-449/V.36
direct connect cable
No. See Chapter 2 for
pin assignments.
RS-232 CSU/DSU device or
modem
UNIVERSAL DTE UNIVERSAL to RS-232 DCE
cable
Yes (3C8023).
RS-232 CSU/DSU device or
modem
RS-232 DTE RS-232 to RS-232 DCE cable No. Easily obtained from
cable manufacturer.
RS-232 IBM cluster controller UNIVERSAL DCE-like UNIVERSAL to RS-232 direct
connect cable
Yes (3C8123).
RS-232 IBM cluster controller RS-232 DCE-like RS-232 to RS-232 direct
connect cable
Yes (3C8132).
SS2TRHWBook Page 7 Monday, May 5, 1997 3:11 PM