Comtech EF Data CRS-120 - Manual (Page 38)

1:1 Redundancy Switch Revision 3
Summary Of Specifications MN/CRS120.IOM
5–2
5.1.1 CRS-120 Summary of Specifications
Table 5-1. CRS-120 Summary of Specifications
Description Requirements
Equipment Type 1:1 Redundancy Switch
Modulators Supported CDM-710 Satellite Modulator (70/140 MHz)
Operating Modes Fully automatic
Manual (via the front panel of the Online Modulator, or via the Modulator’s
remote control interface )
Architecture Continuous fault comparison of Online and Standby units.
Switchover only to an unfaulted unit
Switch Conditions Switchover initiated following: Unit faults or loss of Tx Traffic
Fault detection time 0.5 seconds maximum (time to detect a fault)
Switchover time Within 0.5 seconds of fault detection (time for relay to switch)
IF Frequency Range 52 - 176 MHz
(works with both 70 and 140 MHz Modulator IF options)
IF Impedance 75 Ω
IF Connectors BNC female
Return Loss 18 dB minimum from Tx-Online to the online Tx-A or Tx-B
Tx Insertion Loss 1.0 dB maximum, Tx-A or Tx-B to Tx-Online in low isolation position
1.0 dB maximum Tx-A or Tx-B to the Tx-Standby in low isolation position
Tx Sample -20 dB typical below Tx-Online signal
Tx Isolation 45 dB minimum Tx-A or Tx-B to Tx-Online in the high isolation position
45 dB minimum Tx-A or Tx-B to Tx-Standby in the high isolation position
Indicator Contacts 9 pin D female connector with Form-C contacts indicating A or B is Online
Contacts are 30 VDC at 1 Amp maximum
Indicator LED Two Green LEDs one indicates A Online the other indicates
B Online
De-Energized State With no power applied A is Online
Synchronization The Standby absorbs the configuration of the Online unit
(1:1 mode enabled)
Weight 1.1 lbs (0.5 kg)
Dimensions 1.7H x 7.64W x 4.11D inches
(4.3H x 19.4W x 10.4D cm)
See Section 1 for dimensional outline drawings.
Power requirements 1.2 Watts maximum
+ 12 volts DC @ 100 mA (max)
(Power is supplied by the Online and Standby Modulators, and the unit
current shares when both an ‘A’ and ‘B’ unit are present. These power
supplies are electronically fused and protected.)
A single modulator has capacity to source the required current.
Agency Approvals CE: emissions, susceptibility and safety