RAD Data comm 146 用户手册

RAD Data Communications 2006 Catalog

of 100 m (330 ft) on each side. MME

operates at selectable data rates up to 19.2

kbps. MME/V.35 operates at 56/64 kbps,

replacing high speed modems. 

The MME and MME/V.35 generate the

receive and transmit clocks internally for the

two synchronous DTEs as well as the control

signals necessary to emulate half or full

duplex operation.

The delay between Request to Send and

Clear to Send can be independently set (on

the MME, on port 0 or 6.6, or 53 msec; and

on the MME/V.35, on port 0 or 7, or 

64 msec). Carrier Detect signal can be set 

to constantly ON, or used as a DTE-to-DTE

handshaking signal where RTS on one port

is converted to DCD on the other port.

Three models are available: 

• MME requires no external power supply, 

drawing low power from the data and

control signals. Physical connection

between the MME and the DTEs is via 

25-pin D-type connectors, either male 

or female.

• MME/V.35 requires no external power

supply, drawing low power from the V.35

control signals.

• MME/V.35P has a jack for connection to

an external wall-mounted power supply of 

9.12 VDC/200 mA. The MME/V.35P is used

in applications where the DTEs do not

provide the control signals necessary to

power the MME/V.35. 

Physical connection between the MME/V.35

and the DTEs is via two 34-pin V.35

connectors, each on a 30 cm (1 ft) cable.

100 m

330 ft

100 m

330 ft

IBM 37X5

IBM 3174

MME up to 19.2 kbps

MME/V.35 56/64 kbps

The MME and MME/V.35 miniature modem eliminators

replace two synchronous modems, permitting direct

DTE-to-DTE connection. They have a maximum range

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