Physical Description; General Specifications - Comtech EF Data CDM-710 Installation And Operation Manual

CDM-710 Broadcast Satellite Modem
CDI-60 HSSI Interface
12.2

Physical Description

The HSSI Interface is implemented on a 3.95 x 7.022 inch (10.03 x 17.83 cm) PCB. Connection
to the modem is provided when the 96-pin DIN connector is engaged into the modem slot. The
HSSI interface consists of a 50-pin SCSI connector and an activity Light-Emitting Diode (LED)
that is lit when the interface is enabled.
12.3

General Specifications

Item
Data Rate Range
Interfaces Per Card
Signals Supported
Connector
Electrical
Electrical Typical
Minimum Buffer Size
Impedance
Signal Characteristics
Clock / Data Relationship
Tx Clock Modes
Rx Clock Modes
Gap Clock
(See
Figure 12-3
Tx / Rx Clock
Acquisition Range
TA / CA
Supported Frame Types
Table 12-1. Interface Specifications
Requirement
1 to 70 Mbps
One HSSI
ST, TT (or external) , SD, TA, CA, RT, RD, SG
DCE, 50-pin mini-D female per EIA-613 (HSSI)
Per EIA-612 (10KH ECL compatible).
Differential output voltage: > 590 mV pp into 110 load
Differential Input voltage: 150 to 1000 mV pp with 110
5.0 mS smallest buffer setting, 0.1 mS step size, 32 mS
maximum size
Tx:
110 for TT, SD, TA
Rx:
ST, CA, RT, RD will drive 110
The A terminal is negative with respect to the B terminal for a
binary 0 (Space or OFF) state.
The A terminal is positive with respect to the B Terminal for a
binary 1 (Mark or ON) state.
The data transitions occur during the OFF to ON transition of
the clock. Data is stable during the ON to Off transition of the
clock.
TT (Input clock) continuous.
ST (output clock) is continuous output, programmable in 1 bps
steps and matches the transmit bit rate.
RT (output clock) is continuous from satellite, ST (internal
clock), continuous from TX rate.
Not allowed – Send ST to external equipment DTE so it will
return a continuous clock
)
Asymmetrical clocking with Rx Doppler buffer disabled
Programmed Tx data rate
Default: CA looped to TA
Selection: CA is asserted when there is no modem fault
188 byte MPEG-2 transport stream
and meet HSSI voltage levels
100 ppm
12–3
Revision 9
MN/CDM710.IOM
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