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Electrical Interfaces
5.3 DMD2401 with RS-422/-449 Data Interface
Refer to Figure 5-1 for DC pinouts.
Figure 5-1. DMD2401 Satellite Modem w/ RS-422/-449 Data Interface
5.3.1 RCV IF IN (J1)
The Receive IF Input (J1) is the 50 – 90 MHz, and 100 – 180 MHz Demodulator IF Input.
5.3.2 EXT REF IN (J2)
The External Reference Input Port (J2) is used for injecting an external reference frequency into
the modem. The DMD2401 Master Oscillator is locked to this source. All internally generated
frequencies within the modem will attain the stability of the applied external reference. The
external reference must meet the following parameters:
Frequency:
Amplitude:
Type:
5.3.3 EXT CLK (J3)
The External Clock Port (J3) is used for injecting an external data clock into the modem. The
data symbol clocks may then be selected to be locked to this source. The external clock must
meet the following requirements:
Frequency:
Amplitude:
Type:
5.3.4 XMIT IF OUT (J4)
The Transmit IF Output Port (J4) is the 50 – 90 MHz, and 100 – 180 MHz Modulator IF Output.
5.3.5 TERMINAL (J5)
The Terminal Port (J5) pinouts are listed below in Table 5-2.
5-2
DMD2401/DMD2401L/DMD2401 IBS/IDR Satellite Modem
10 MHz, 9 MHz, 5 MHz, 2.048 MHz or 1.024 MHz.
0.2 Vp-p to 5 Vp-p
Sinewave or Squarewave
9600 Hz to 2.048 MHz
0.2 Vp-p to 5 Vp-p
Sinewave or Squarewave
TM065 – Rev. 3.3
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