Nortel Networks 553-3001-211 manual EIA Ccitt, Dte Dce

Page 388 of 894 NT6D80 MSDL card

Table 144

Asynchronous interface specifications (Part 2 of 2)

Parameter	Specification	Configured
	RS-422	Switches
Mode	DTE or DCE	Switches

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 page 392 of this document.

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 145 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 145

RS-232 interface pin assignments (Part 1 of 2)

		EIA	CCITT
Pin	Signal name	circuit	circuit	DTE	DCE
1	Frame Ground (FG)	AA	102	—	—
2	Transmit Data (TX)	BA	103	X

553-3001-211 Standard 2.00 September 2004