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Modem Wiring Pinouts

C-2

C.2.2 Modem Wiring

C.2.2.1 DSR (Data Signal Ready) versus CD (Carrier Detect)

By default, most modems assert CD only during a valid connection. In this case the

modem’s CD pin may be wired to the Server’s DSR pin. Alternately, many modems can be

configured such that DSR acts like CD. In this case, the modem’s DSR pin may be wired

to the Server’s DSR pin.

C.2.2.2 DTR (Data Terminal Ready)

The MSS normally asserts DTR. When modem control is enabled on the MSS, the server

will de-assert DTR for three seconds each time the port is logged out and each time a user

disconnects from a modem service. The modem must be configured to hang up and recycle

when DTR is de-asserted. If the modem is not configured in this way, sessions may not be

properly disconnected.

Lantronix MSS100 Installation Guide

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