Product specifications

CDM-710 Broadcast Satellite Modem Revision 10
CDI-60 HSSI Interface MN/CDM710.IOM
12.3 General Specifications
Table 12-1. Interface Specifications
Item Requirement
Data Rate Range 1 to 70 Mbps
Interfaces Per Card One HSSI
Signals Supported ST, TT (or external) , SD, TA, CA, RT, RD, SG
Connector DCE, 50-pin mini-D female per EIA-613 (HSSI)
Electrical Per EIA-612 (10KH ECL compatible).
Electrical Typical
Differential output voltage: > 590 mV pp into 110Ω load
Differential Input voltage: 150 to 1000 mV pp with 110Ω load
Minimum Buffer Size 5.0 mS smallest buffer setting, 0.1 mS step size, 32 mS maximum size
Impedance Tx:
Rx:
110Ω for TT, SD, TA
ST, CA, RT, RD will drive 110Ω and meet HSSI voltage levels
Signal Characteristics
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.
Clock / Data Relationship
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.
Tx Clock Modes TT (Input clock) continuous.
ST (output clock) is continuous output, programmable in 1 bps steps and
matches the transmit bit rate.
Rx Clock Modes
RT (output clock) is continuous from satellite, ST (internal clock),
continuous from TX rate.
Gap Clock
(See
Figure 12-3)
Not allowed – Send ST to external equipment DTE so it will return a
continuous clock
Tx / Rx Clock Asymmetrical clocking with Rx Doppler buffer disabled
Acquisition Range
Programmed Tx data rate ± 100 ppm
TA / CA Default:
Selection:
CA looped to TA
CA is asserted when there is no modem fault
Supported Frame Types 188 byte MPEG-2 transport stream
Test I/O Loopback not provided
Simplex (Tx only or Rx only) or full duplex
Signal Sense Programmable Normal or Inverted for TT and TD, RT and RD
Cards Per Modem The interface operates in Slot 1.
Cable Length to 52 Mbps
2 m (6 ft) nominal, up to 15 m (49 ft) maximum – Note higher data rates
usually require shorter cable lengths.
LED Green LEDs indicate channel is enabled
12–3