Dtr

Pin	Mnemonic	Signal Name	Description

20	DTR	Data	Used to control switching of the DCE to the
		Terminal	communication channel.
		Ready
21		Not	None.
		connected
22		Not	None.
		connected
23		Not	None
		connected
24	TXC	Terminal	Generated by the DTE to provide timing
		Clock	information to the DCE. Used only in
			synchronous mode and only when the driver
			requests a locally generated clock. Otherwise,
			TXC echoes the modem-generated clock. The
			falling edge of the clock corresponds to the
			center of the data bit transmitted on TXD.
25		Not	None.
		connected

A.3 Reference for the Twisted-Pair Ethernet (TPE) Connector

The twisted pair Ethernet (TPE) connector is a RJ-45 type connector located on the main logic board back panel.

Connect only TPE cables into the TPE connector.

Connector Signal Descriptions 235