Multi-Tech Systems MT202TD 1200 manual Leased Line Connections, Four-Wire Leased Line Connection

Chapter 2 - Installation & Connection

Leased Line Connections

The MT202TD modem operates on leased lines and may be configured in two ways: two-wire or four-wire. In a leased-line application, the line is continuously connected to the modem. In two-wire leased-line applications, only one modem may transmit at a time (this is known as half- duplex). In a four-wire configuration, one pair of wires should connect to the transmitter of the local modem and the receiver of the remote modem. The other pair of wires should connect to the remote modem’s transmitter.

			UUUUU
			UUUUU
	Digital Analog	Analog Digital
Computer or Terminal	Local Modem	Remote Modem Computer or Terminal

Figure 3-1. Four-Wire Leased Line Connection

In multi-point leased line configurations, the user must arrange to have the phone company install the multi-point network using a four-wire configuration. The following illustration shows a typical bridged multi-point configura- tion.

MT202T

MT202T

MT202T

MT202T

Boxes marked “B” are Bridge Circuits

							MT202T
	B		B		B
MT202T		MT202T
				600 ohms		600 ohms

Figure 3-2. Four-Wire Multi-Point Connection

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