Comtech EF Data DM240XR - Manual (Page 77)

DM240XR High-Speed Digital Modulator Rear Panel Interfaces
MN-DM240XR– Revision 13 5–7
5.12 Plug-In Interface Cards (PIICs)
The DM-240XR provides the customer with 2 standard PIIC slots. With PIIC interfaces there is
greater flexibility for changing and upgrading the terrestrial interface. Each of the interfaces
described below consists of a single card with a metal back plate. Each interface can be plugged
into one of two slots on the rear of the unit (Figure 5-4).
Figure 5-4, Typical PIIC
To insert the PIIC, slide the card completely into the appropriate slot (1 or 2) ensuring that it lines
up with the alignment slots. When the PIIC is fully seated, tighten the two screws hand tight
5.12.1 ASI PIIC
This interface supports two terrestrial interface types.
5.12.1.1 ASI (Asynchronous Serial Interface)
The ASI interface is supported on the BNC Connector (Figure 5-1c). The interface complies with
DVB ASI Electrical Specifications. The maximum data rate is 216 Mbps.
5.12.1.2 AASI (Advanced Asynchronous Serial Interface)
The AASI Interface is a specialized mode of the normal ASI Interface (Figure 5.1b). The
interface allows the user to input a variable rate data stream into the modulator (as long as the
input data rate does not exceed the programmed data rate). The AASI Interface inserts MPEG-2
Null Packets to provide a constant data rate to the modulator.