Redundant System Controllers
Redundant systems increase system availability by including two or more of the same type of equipment (unit) in the signal path, where at least one unit serves as a backup for the others. The backup may be switched in to replace an on-line unit if a fault is detected in that unit.
Common types of redundant systems are 1:1, which consists of two units, one on-line and one backup; and 1:2, which consists of three units, two on-line carrying two separate channels, and one backup that can replace either of the on-line units. Less-common Dual 1:1 systems consist of two pairs of 1:1 systems (four units total) in one installation, with one redundant pair on each channel.
The RSC series of redundant system controllers are capable of controlling various types of equipment in 1:1, 1:2, or Dual 1:1 systems. They can directly power most LNA or LNB units and monitor the output voltages and currents to detect faults. The RSC can also monitor external alarm signals, such as summary alarms from SSPA units, or a combination of output currents and external alarm inputs. Upon detecting a fault, the RSC drives an RF transfer switch to activate the spare unit.
The RSC offers monitoring and control of auxiliary RF hardware; remote monitor and control via network, serial interface, or parallel I/O; flexible configuration of the system behavior; remote disable of local controls for security; and the ability to detect and report certain failures within the controller itself.
- 10/100 Base T Ethernet network interface
- Internal webpage for configuration, monitor and control
- Supports SNMP v1, v2c, and v3
- Standard rack-mount chassis, 19” wide panel, 1¾” (1 RU) high
- Dual, redundant power supplies
- Manual or automatic operation
- Monitors unit currents, external alarms, or a combination of both
- Automatically switches RF path to standby unit when unit failure occurs
- User-selectable RS-232/-422/-485 serial I/O, and parallel I/O M&C interfaces
- Menu-driven user configuration of all options
- Mimic front panel graphically depicts switch positions and unit status
- Worldwide universal AC input capability standard; consult factory for DC prime power
- Audible alarm
- CE certified and RoHS compliant; EAR 99
- Monitor and power Tracking Unit in monopulse systems
Remote Control Panel Option
A second RSC can be linked to a primary RSC to provide full system control from an alternate control site. When set up this way, the secondary RSC is referred to as a remote control panel, or RCP. The configuration and settings of the primary RSC are transferred to the RCP, which then mimics its controls and interfaces. This permits system operation from a location that is up to 4000 ft (1200 m) distant from the primary controller.
Configuring an RSC to become an RCP (and the reverse) can be done through the front panel controls by the user.
|Redundant Controller Specifications Datasheet||View Document|
|Unit Status Monitor Methods||Controller monitors unit bias current; alarm is generated if current goes outside of allowed
tolerance window (LNA or LNB systems). Controller also monitors external alarm inputs (SSPA
and other systems) or combinations of both internal unit current and external alarm inputs.
|Unit Current Window Width
||±5% to ±25% of nominal; user selectable in 5% steps (applies to all monitored unit currents)
||100 ms maximum|
|Unit Power Outputs
||+14.3 to +15.0 Vdc, 700 mA maximum
|Switch Drive Outputs
-22 to -28 Vdc, 2 A maximum
|External Alarm Inputs
||Optionally up to one per unit; require sinking 5 mA at 5 Vdc to negate alarm|
|Serial I/O Interface||RS-232/RS-422/RS-485 2- or 4-wire; user selection|
|Parallel I/O Interface||Control inputs: Contact closures to ground; require sinking 20 mA at 15 Vdc
Status outputs: Form ‘C’ dry contacts; 100 Vdc, 0.5 A, 3 W max (resistive load)
19” (483 mm) W x 1.72” (43.7 mm) H x 17.5” (445 mm) D; 7.6 lb (3.4 kg)
|Chassis Slides||Standard. Radio relay rack-mount brackets available on request.|
|Cable Length to Plate Assy
||Order cable separately. 100 ft (30 m) to 250 ft (75 m) lengths in 50 ft (15 m) increments are
standard; other lengths (up to 500 ft or 150 m) are available by special order.
|AC Input (standard)
||90-264 Vac, 47–63 Hz, 100 W; Dual AC inputs and dual redundant power supplies.|
|DC Input (option)
||Requires DC-AC inverter. Consult factory.|
|Temperature Range||Operating: 0 to +50 °C (indoor equipment environment)
Storage: -40 to +70 °C
Operating: 5% to 95% non-condensing
|Altitude||Up to 10,000 ft (3000 m) above mean sea level|
||MTBF: 48,200 hours; MTTR: less than 30 minutes with spares and proper technical person.|