Comtech EF Data MM200 - Manual (Page 81)

MM200 High-Speed Microwave Modem Electrical Interfaces
TM086 - Rev. 4.1 5-5
6 +TX 1 +TX
8 -RX 13 -RX
9 +TX 3 +TX
7 to
12
+RX CLK to
+TX CLK
8 to
11
-RX CLK to
-TX CLK
From the Overhead to the Remote
Port of the Remote Modem (Cable B)
9-Pin ‘D-Sub’ 15-Pin HD
Female ‘D-Sub’ Male
6 -TX 6 -TX
5 GND 2 GND
1 +TX 1 +TX
9 -RX 13 -RX
8 +TX 3 +TX
7 to
12
+RX CLK to
+TX CLK
8 to
11
-RX CLK to
-TX CLK
5.5 Ethernet Interface (I/O)
The Ethernet Interface (J4) can be used for the monitor & control functions of the unit. The
physical interface is a standard female RJ-45 Connector.
5.6 TX RF Port (Output)
The TX RF Port (J5) is used to transmit RF signals. The physical interface is a Female 750 Ω
BNC Connector and has an output of 50 – 90 MHz IF.
5.7 RX RF Port (Input)
The RX RF Port (J6) is used to receive RF signal
s. The physical interface is a Female 750 Ω
BNC Connector and has an output of 50 – 90 MHz IF.
5.8 External Reference (Input)
The External Reference Input (J7) is supplied to allow the customer to phase-lock the modulator’s
internal oscillator to an external reference.
This female BNC Connector accepts a 1.5 – 5 Vp-
p @ 50Ω. The frequency range of the external
reference is 1 – 10 MHz in 8 kHz steps.