Comtech EF Data CDM-600/600L - Manual (Page 71)

CDM-600/600L Open Network Satellite Modem Revision 3
Rear Panel Connector Pinouts MN/CDM600L.IOM
3–11
3.4.6 J12 Ext Ref (CDM-600L) / Ext Freq Ref (CDM-600)
CDM-600L: This 50
Ω BNC female connector provides an external reference input
for the Tx and Rx IF synthesizers, and for the internal transmit clock. The load
impedance is 60.4
Ω, so the VSWR is less than 1.25:1 at either 50Ω or 75Ω. Input
level is 0 dBm minimum to +20 dBm maximum at 1, 2, 5, 10, or 20 MHz. When
external reference is enabled, the internal 10 MHz reference oscillator is phase locked to the
external reference input by a 10Hz bandwidth PLL. If no activity is present at the external reference
input, the modem will revert to the internal 10 MHz reference.
CDM-600 (optional): This is optional SMA female connector is used to permit the
connection of a high-stability external reference signal.
Modem Connector
Connector
Type
Description Direction
CDM-600L J12 Ext Ref BNC External Synthesizer Reference Input In
CDM-600 J12 Ext Freq Ref SMA High-stability External Reference Input In
3.5 Power / Ground Connections
3.5.1 Alternating Current (AC) Power Connector (Standard)
A standard Type ‘IEC’ detachable, non-locking, 3-prong power cord
supplies the Alternating Current (AC) power to the modem.
Note the following:
AC Power Specifications
Input Power CDM-600L: 290W maximum, 55W typical without BUC power supply
CDM-600: 40W maximum, 30W typical
Input Voltage 100-240 VAC, +6%/-10% - autosensing
(total absolute max. range is 90-254 VAC)
Connector Type IEC
Fuse Protection CDM-600L: Line and neutral fusing
5.0A Slow-blow 20mm fuse CEFD P/N FS/5ASB-IEC
(115 and 230 VAC operation)
CDM-600: Line and neutral fusing
T1.25A Slow-blow 20mm fuse (115 VAC operation)
T0.75A Slow-blow 20mm fuse (230 VAC operation)
IMPORTANT
For continued operator safety, always replace the fuses with
the correct type and rating.