Comtech EF Data CDM-625A - Automatic Uplink Power Control (AUPC); Data Interfaces

CDM-625A Advanced Satellite Modem MN-CDM625A
Introduction Revision 4
1–22
1.4.3 Data Interfaces
Primary Data
(4 selectable modes)
RS-422/EIA-530 DCE (Rates up to 14 Mbps)
(also supports X.21 DCE & DTE up to 2.048 Mbps and 8k ESC orderwire for IDR)
V.35 DCE (Rates up to 14 Mbps)
LVDS serial (Rates up to 25 Mbps)
HSSI serial (Rates up to 25 Mbps)
25-pin D-sub (female)
G.703 (Tx In, Drop Out,
Insert In, Rx Out)
1.544 Mbps T1 (Balanced 100
Ω
)
6.312 Mbps T2 (unbalanced 75 Ω or balanced 110 Ω)
2.048 Mbps E1 (unbalanced 75 Ω or balanced 120 Ω)
8.448 Mbps E2 (unbalanced 75 Ω)
Note: All Drop and Insert modes are a FAST option.
9-pin D-sub (female)
or BNC (female)
ASI
Uses G.703 (Tx In, Rx Out) ports
BNC (female)
Auxiliary G.703
(used for Quad D&I modes)
Two additional 2.048 Mbps E1 ports (balanced 120
Ω
)
Note: All Drop and Insert modes are a FAST option.
9-pin D-sub (female)
External Reference In/Out
As an input:
1, 2, 5 or 10MHz -6dBm to +10dBm (nominal 50/75 Ω)
As an output:
10MHz, 2.7 volts peak-to-peak +/- 0.4 volts, low impedance output
BNC (female)
Overhead Data
IDR BWA
Inputs/Outputs
ADPCM Audio Interface
RS-422 octet clocks for IDR ESC & IBS
RS-422 IDR 64 kbps ESC data & clock
IDR BWA Inputs/4 backward alarm Form C relay outputs
2 audio channels, each occupying 32 kbps bandwidth as part of IDR overhead or as
a 64 kbps primary data rate option.
600 Ω balanced – 0 dBm0 nominal, -6 to +8 dB, 2 dB steps
44-pin High-density
D-sub (male)
Modem Alarms
Relay outputs (Tx, Rx & unit faults)
Demodulator I & Q test outputs (constellation)
Demodulator Rx Signal Level output (0 to 2.5 volts)
External carrier off input
15-pin D-sub (male)
ESC (Overhead)
Standard IBS ESC interfaces
RS-232/485 High Rate ESC data
RS-232/485 ESC++ data
9-pin D-sub (female)
Remote Control
RS-232 or RS-485 modem control and monitoring
9-pin D-sub (male)
PMSI Interface
Pre-mapped Symbol interface
(used by DoubleTalk Carrier-in-Carrier function)
9-pin D-sub (female)
1:1 Control
Control interface for CRS170A/CRS180 1:1 Redundancy unit
9-pin D-sub (male)
Ethernet
4 ports of 10/100 BaseT auto-sensing full/half duplex Ethernet
RJ-45
1.4.4 Automatic Uplink Power Control (AUPC)
Operating Mode
Requires Closed Network Framed mode (EDMAC, D&I++, Enhanced D&I, or ESC++) for transport of
Eb/No information from remote modem (EDMAC can be enabled or disabled)
Target Eb/No range 0 to 14.9 dB at remote demod (default is 4.0 dB)
Max AUPC range 0 to 9 dB (default is 3 dB)
Monitor functions Remote demod Eb/No
Tx power level increase
(front panel or via remote control interface)