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Appendix C
CDM-760 Advanced High-Speed Trunking Modem
C.2.1.1 G.703 E3/T3/STS-1 PIIC Module – Specifications
C.2.1.1.1 General Specifications
Item
Interfaces
External Clock Input
Connector Type
Input Amplitude
Input Frequency
Signal Characteristics
Maximum Buffer Size
Clock Options
Acquisition Range
Test
Hot Swap Capability
C.2.1.1.2 Interface Specifications
Interface
G.703 Unbalanced:
Connector Type
Signals Supported
Tx and Rx Data Rates
Alarms
Description
1 - Tx G.703 port, E3, T3, STS-1 Input
1 - Rx G.703 port, E3, T3, STS-1 Output
1 – External Clock Input
BNC female
Impedance
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%
75 ms max for Doppler, 20 Mbit for ISSY
Tx Clock = Tx, Rx (satellite) , or External
Rx Clock = Tx, Rx (satellite), Internal, or External
Programmed Tx rate +/- 100 ppm
Baseband Loopback (at interface)
Interface Loopback (through interface card)
2047 test pattern generator
Yes
Description
Channel supports G.703 E3, T3, and STS-1.
BNC female
ITU-T-G.703 SD, RD
Data Rate
(E3) 34.368, (T3) 44.736 Mbps, (STS-1) 51.84 Mbps
Tx and Rx data rates are programmed the same
Line Coding
HDB3 (for E3), B3ZS (for DS3), AMI (Common)
Pulse Mask
ITU-T-G.703
Jitter
Telcordia GR-499-CORE For T3 and STS-1, G.823 for E3
Impedance
75 Ω Per ITU-T-G.703
Loss of signal, All 1's
C–4
Revision 4
MN-CDM760
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