Interface Specifications; Table 4-4. Digital Interfaces - Comtech EF Data SLM-3650 Installation And Operation Manual

SLM-3650 Satellite Modem
Theory of Operation
4.5.1

Interface Specifications

Note: Refer to Appendix A for information on the following:
•
G.703
•
IDR
•
IBS
•
Drop and Insert (D&I)
•
Asynchronous
4.5.1.1 Digital Interfaces
Refer to Table 4-4 for digital interfaces.
Physical Interfaces
Data Rates
External Clock Frequency Range
External Clock Amplitude
External Clock Impedance
External Clock Input Type
TX Clock Reference
Plesiochronous Buffer
Buffer Clock Reference
Buffer Depth
Buffer Centering
Overflows/Underflows
Loopback
TX Faults
TX Drop
TX Data/AIS
TX Clock PLL
TX Clock Activity
Programming
Configuration
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Table 4-4. Digital Interfaces

Main Channel
EIA-449/EIA-422
V.35
G.703 T1 and E1 (1544 and 2048 kbps)
EIA-232 ≤ 120 kbps
2.4 kbps to 4.375 Mbps, in 1 Hz steps
2.4 kHz to 4.376 MHz
Common Mode 0 to 2.5 VDC
100kΩ
Square wave
Duty cycle 50% ±10%
Normal (derived from SD for G.703 interface, SCTE, TT)
Internal (10 -5 accuracy), Optional (2 x 10 -7 high stability)
External
Included in receive path
TX satellite, EXT CLK, RX, SAT, Internal, Insert CLK D&I only
Monitor accurate to 1% displayed on front panel
Automatic (start of service, overflow, or underflow) and Manual
Logged as stored fault loopback
Baseband loopback
Interface loopback
Reported Faults
RX Faults
Buffer Underflow
Buffer Overflow
RX Data/AIS
Frame BER
Backward Alarm
Buffer Clock PLL
4–21
MN/SLM3650.IOM
Buffer Clock Act
DEMUX Lock
RX 2047 Lock
Buffer Full
RX Insert
Programming
Revision 3