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System Overview:
In spite of all the built-in redundancy in Voice Switching systems used for ATC communications, unfortunately some times these systems go down, resulting in a total loss of communications. |
The problem may be the operating software, common hardware, AC power or UPS. Vital communications with the airplanes and other facilities may be lost. A situation like this at an air traffic control center or an airport may cause a serious safety problem and may result in an accident. Digital Signal Products, Inc. has designed Model 2040 Voice Switch By-Pass (VSBP) system to alleviate such situations. The Model 2040 VSBP is designed to provide ATC controllers a direct access to radios (A/G Communications) for primary frequencies assigned to that position in the event of the failure of the Voice Switch. The Model 2040 operates totally independent of existing voice switches, such as ETVS, ICSS, IVSR, NVS, RDVS, VSCS, etc. The VSBP Jack installed in the operator console. The VSBP operator jacks are equipped with orange color face plate for clear and unambiguous identification. For enhanced safety and security the VSBP system is powered from a separate circuit breaker and comes equipped with its own Uninterruptible Power Supply (UPS). The system can be configured to provide two A/G frequencies to each operator, or two operators can share two frequencies. When VSBP is activated all ATC communications are automatically recorded on their normally assigned recorder channels.
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| VSBP Chassis & Circuit Cards
The VSBP chassis is 19-inch rack mountable, 4U high, and it can accommodate up to six radio-channels which can be assigned to three or four ATC operators, as required. Each ATC operator is provided with a Headset/Handset Jack Module. The Jack Module is powered from the Power Supply located in the VSBP chassis. One 7-pair cable connects the Jack Module to the VSBP chassis. A front panel located dual-volume control provides adjustments for receive audio and side-tone levels. Operator uses Push-to-Talk (PTT) switch to key radios assigned to that ATC position. Receive audio is muted when PTT is active. Built-in receive/transmit AGC and level limiting features provide audio enhancements and protection for ATC operator's ear. The Model 2040 Jack Module comes with built-in ESD and transient protection for superior performance and long operating life.
Combination of a Bridge card and two Relay cards provide all the necessary audio and control circuitry required for an operator to use the VSBP switch. The Relay card transfers necessary audio and radio control circuits from the normally used voice switch to the VSBP switch when an operator plugs handset/headset into the VSBP Jack. The circuits transferred include radio transmit audio, receive audio, transmit & receive main/standby antenna controls, PTT controls and the position recorder. The Bridge card performs summing of two incoming receive radio audio into one headset output port. It also splits operator transmit audio to two radios transmitters while maintaining 600 Ohms impedance. The Bridge Module is provided with front panel jacks for audio monitoring and test tone insertion.
The VSBP chassis is powered from a built-in 110/220 VAC Power Supply. The Power Supply provides 24V DC output for the VSBP system. Separate fuses are used for powering each ATC position circuit. An alarm is generated for any fuse failure. DSP's Model 2040 VSBP provides the best cost effective ATC backup solution for applications where reliability, quality, efficiency and economy count. It comes with 3-year warranty.
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