Nortel Circuit Card Installation Manual page 400

Page 400 of 906
553-3001-211 Standard 3.00
NT6D80 MSDL card
Table 149
Asynchronous interface specifications (Part 2 of 2)
Parameter
Mode
Emulation mode Each port can be configured to emulate a DCE port or a
DTE port by setting the appropriate switches on the MSDL. For details on
how to set the switches, refer to "Installation" on
DCE is a master or controlling device that is usually the source of information
to the DTE and may provide the clock in a synchronous transmission linking
a DCE to a DTE.
DTE is a peripheral or terminal device that can transmit and receive
information to and from a DCE and normally provides a user interface to the
system or to a DCE device.
Interface Each MSDL port can be configured as an RS-232 or an RS-422
interface by setting the appropriate switches on the card.
Table 150 lists the RS-232 interface specifications for EIA and CCITT
standard circuits. It shows the connector pin number, the associated signal
name, and the supported circuit type. It also indicates whether the signal
originates at the DTE or the DCE device.
This interface uses a 26-pin (SCSI II) female connector for both RS-232 and
RS-422 circuits.
Table 150
RS-232 interface pin assignments (Part 1 of 2)
Pin Signal name
1 Frame Ground (FG)
2 Transmit Data (TX)
August 2005
Specification
RS-422
DTE or DCE
EIA
circuit
AA
BA
Configured
Switches
Switches
page 404 of this document.
CCITT
circuit DTE
102 —
103 X
DCE
—