Doubletalk Carrier-In-Carrier (Cnc); Approvals - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Introduction
1.4.8 DoubleTalk
Operating Mode
CnC Ratio
Symbol Rate Ratio
Inbound/Outbound frequency
uncertainty
Delay range
Es/No Degradation (dB)
measured at 0.0 dB CnC
Ratio
Monitor Functions
CnC Monitor Accuracy
1.4.9

Approvals

"CE" as follows:
FCC
TM
Carrier-in-Carrier
Requires the two carriers in a duplex circuit to share a common frequency. Different symbol rates are
allowed.
Ratio of Interferer Carrier Power to Desired Carrier Power (in dB). Positive values represent a stronger
Interferer Carrier, and negative values represent a stronger Desired Carrier. Range is +7 dB to -7 dB.
3:1 Tx/Rx or Rx/Tx
±100kHz
0 - 400 ms (230 - 290 ms factory default)
QPSK, 0.3 dB
8-PSK, 0.3 dB
16-APSK, 0.6 dB
32-APSK, 1.0 dB
• Delay, in milliseconds
• Frequency offset (between outbound interferer and desired inbound): 100 Hz resolution
• CnC ratio, in dB (ratio of absolute power, outbound interferer to desired inbound)
± 1.0 dB for symmetric symbol rate
EN 55022 Class A (Emissions)
EN 50082-1 (Immunity)
EN 60950 (Safety)
FCC Part 15 Class A
®
(CnC)
EN 61000-3-2
EN 61000-3-3
EN 61000-4-2
EN 61000-4-4
EN 61000-4-5
1–14
Revision 1
MN-CDM750
EN 61000-4-6
EN 61000-4-8
EN 61000-4-9
EN 61000-4-11
EN 61000-4-13