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

CDM-710 Broadcast Satellite Modem
CDI-40 ASI Data Interface

10.2 General Specifications

The interface operates to the specifications described in Table 10-1.
General Specifications
Data Framing Formats
Test Pattern
Hot Pluggable
ASI Specifications
Data Rate
Tx Clock Rate
Acquisition
ASI Transport
Impedance
Return Loss
Connectors
Electrical Properties
Packet Types
Signal Types
Voltage Level Rx Out
ASI Data Loop 3 dB
Frequency, Tx Only
Jitter Tolerance
Jitter Transfer
Cable Length, Typical
Tx Input Selection
Loss Of Tx Input Data
Monitor & Control
Controlled Functions
Monitored Functions
ASI Input Select
ASI Data Loop BW
Selection
Table 10-1. Interface Specifications
ASI: 188 or 204 byte packets per ETS 300 421.
23
Tx only, 2047 or 2 -1 pattern compatible with typical BER tester
No
Up to155 Mbps
Programmed data rate
The transport rate is 270 Mbps for all data rates
75
13 dB over 5 to 270 MHz
BNC Female
Per EN 500083-9
Burst or distributed
Serial data
800 mV ± 10% into 75 , (J2, J3 of PL/10881-3 or J2 of PL/10881-
4). J3 of PL/10881-4 is higher for 1:1 applications for 800 mV
typical after 3 dB combiner (Figure 10-5).
Wide: 2 Hz
Narrow: 0.5 Hz
Meets ITU-T G.823 (3/93) and ITU-T G.824 (3/93)
0.5 dB peaking up to cutoff frequency.
-20 dB per decade beyond cutoff.
30 meters (100 feet), RG59
40 meters (140 feet), Belden 8281
Two inputs with selection to control, which is active
Null packets are formed and transmitted.
Loss of Tx Input is selectable as a fault or alarm.
Interface I/O Loopback, Digital Loopback
Data Rate
Loss of Data, Mask as Fault or Alarm
Variable ASI Mode
Loss of Tx Data: The modulator indicates a loss of sync (framed
modes) and transmits Null Packets in the data portion of the
frame.
Tx Clock PLL Program Error
Data Violations (Tx)
FIFO Faults
Input J4 or Input J5
Wide and Narrow (Tx Input Data)
10–4
100 ppm
Revision 9
MN/CDM710.IOM