Comtech EF Data CDM-750 - Manual (Page 231)

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Appendix B MN-CDM750
B–5
B.2.1.1 G.703 E3/T3/STS-1 PIIC Module Summary of Specifications
B.2.1.1.1 General Specifications
Item Description
Interfaces 1 - Tx G.703 port, E3, T3, STS-1 Input
1 - Rx G.703 port, E3, T3, STS-1 Output
1 – External Clock Input
External Clock Input
Connector Type
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, 20, 34.368 (E3), 44.736 (T3), and 51.840 (STS-1) MHz
Sine wave or square with duty cycle of 50 ± 10%
Maximum Buffer Size 75 ms max for Doppler, 20 Mbit for ISSY
Clock Options Tx Clock = Tx, Rx (satellite) , or External
Rx Clock = Tx, Rx (satellite), Internal, or External
Acquisition Range Programmed Tx rate +/- 100 ppm
Test Baseband Loopback (at interface)
Interface Loopback (through interface card)
2047 test pattern generator
Hot Swap Capability Yes
B.2.1.1.2 Interface Specifications
Interface Description
G.703 Unbalanced:
Connector Type
Signals Supported
Data Rate
Tx and Rx Data Rates
Line Coding
Pulse Mask
Jitter
Impedance
Channel supports G.703 E3,T3, and STS-1.
BNC female
ITU-T-G.703 SD, RD
(E3) 34.368, (T3) 44.736 Mbps, (STS-1) 51.84 Mbps
Tx and Rx data rates are programmed the same
HDB3 (for E3), B3ZS (for DS3), AMI (Common)
ITU-T-G.703
Telcordia GR-499-CORE For T3 and STS-1, G.823 for E3
75 Ω Per ITU-T-G.703
Alarms Loss of signal, All 1's