Comtech EF Data DD240XR Rev Е - Manual (Page 94)

Electrical Interfaces DD240XR High-Speed Digital Demodulator
5-6 MN-DD240XR – Rev. E
Table 5-5b. J8
− RS-422 Serial (ASI/RS530)
Pin No. DVB Signal Name Direction
7 GND Ground
9 CLK+ Output
17 CLK- Output
16 Data+ Output
3 Data- Output
1 GND Output
5.9.2 EXT CLK (HSSI and G.703 Interfaces Only)
The External Clock Input (J8) is supplied to allow the customer to phase-lock the Doppler buffer
clock to an external reference. The external reference can be used directly as a buffer clock.
This female BNC Connector accepts a 1.5 – 5 Vp-p @ 50 Ohms. The allowed frequencies are:
1.1 MHz 1.544 MHz 6.312 MHz 5.0 MHz
2.0 MHz 2.048 MHz 8.448 MHz 10.0 MHz
5.9.3 PARALLEL/LVDS (ASI/M2P Interface Only)
This interface is identical to the ASI/Parallel RS-422 Interface except that the electrical
specifications of the Parallel Interface (M2P, DVB) comply with LVDS instead of RS-422.
5.10 HSSI Interface (J9) (HSSI Interface Only)
The HSSI (High-Speed Serial Interface) complies with the HSSI Functional and Electrical
Specifications. The physical interface is a 50 Pin SCSI-2 Type Connector. Electrical levels are
ECL. The pinouts for this interface are listed in Table 5-6.
5.11 TX CLK (J10) (HSSI Interface Only)
This connector is used for the HSSI Interface.
5.12 J12 Ports
5.12.1 ASI (ASI/DVB SPI and ASI/M2P Interfaces Only)
The Asynchronous Serial Interface is supported on the BNC Connector. The interface complies
with DVB ASI Electrical Specifications. The maximum data rate is 216 Mbps.
5.12.2 G.703 OUT (G.703 Interface Only)
The G.703 Interface supports three different G.703 rates (E3, DS-3, and STS-1). The physical
interface is a single Female BNC Connector. The data rate for the E3 Interface is 34.368 Mbps,
44.736 Mbps for the T3 Interface, and 51.84 Mbps for the STS-1 Interface. The interface
complies with G.703 electrical specifications.