Comtech EF Data CDM-700 - Manual (Page 231)

CDM-700 High Speed Satellite Modem Revision 5
Dual E3/T3/STS-1 Interface (CDI-10) MN/CDM700.IOM
B–3
B.2 Summary of Specifications
Item Requirements
General
Interfaces
2 each Independent G.703 ports, E3, T3, and STS-1
Note: Selection of a port requires TX and RX having the same
data rate.
External Clock Input 1 input
Interfaces Operating
Simultaneously
None, one or both of the interfaces
Interface Selection Each of the interfaces is individually enabled
Rx Buffer:
G.703 Frame Types
Type Bits Bytes
G.751
G.752
G.753
STS-1
1536
4760
2148
6480 192
595
268.5
810
Note: Programmable in 0.5 ms increments.
Minimum Buffer Size for any rate 0.5 ms
Maximum Buffer Size
G.751 61 ms
G.752 44 ms
G.753 61 ms
STS-1 40 ms
Clock Options
Tx Clock = Tx, Rx (satellite) or External
Rx Clock = Tx, Rx, External or Internal
Note: Asymmetric operation is not supported
Acquisition Range Programmed Tx data rate
± 100 ppm
Test
Baseband Loopback (at interface)
Interface Loopback (through interface module)
2047 test pattern generator
Hot Swap Capability None
Interfaces
G.703 Unbalanced:
Connector
Type
Signals Supported
Data Rate
Tx and Rx Data Rates
Line Coding
Pulse Mask
Jitter
Impedance
2 independent channels supporting G.703 E3, T3, and STS-1.
BNC, female
ITU-T-G.703 SD, RD
34.368, 44.736 and 51.84 Mbps
Tx and Rx data rates are programmed the same
HDB3 (for E3), B3ZS (for DS3 STS-1), AMI (Common)
ITU-T-G.703
Bellcore GR-499 core For T3 and STS-1, G.823 for E3
75
Ω Per ITU-T-G.703
External
Clock
Input
Connector
Impedance
Input Amplitude
Input Frequency
Signal Characteristics BNC, female
75
Ω ± 5%
0.5 to 5.0 V peak to peak
1, 2, 5, 10, 2.048, 34.368, 44.736, and 51.84
Sine wave or square with duty cycle of 50
± 10%
Alarms
Loss of Signal
All 1’s
Physical and
Environmental
Environmental
Humidity 0 to 50
°C (32 to 122°F)
Temperature 0 to 95% non-condensing
Dimensions
3.95 W x 8.14 D x 1.5 H inches
(10.03 W x 20.67 D x 3.81H cm)