N+1 Hot-standby System Architecture


  • Detail LED diagnostics
  • Redundancy of the main system components
  • Remote fault report output


PSC VODEC PA/GA Public Address and Alarm system is specifically designed for critical life safety applications. To improve system availability the PSC VODEC PA/GA system can be configured in an N+1 architecture. N+1 denotes that certain key front end parts of the PA/GA system are duplicated with the second hardware set being held in hot-standby. N+1 can apply to loudspeaker power amplifiers and/or host management according to client specification. In either case field equipment is not duplicated in N+1, i. e. there are non-redundant loudspeaker/beacon networks. Amplifier replacement is automatic and in addition to supervision of on-line amplifi cation the standby amplifi er is monitored also. For ultimate security A+B fully duplicated architecture should be specified.

The PSC VODEC VA300/CAGE is fi tted with N+1 capability for power amplification as standard. Each VA300/CAGE can support 8 X VA300+M amplifiers out of which it is possible to simply configure slot 8 as hot-standby for the remaining (up to) seven on-line amplifiers. It is possible to extend the hot-standby to provide support for on-line amplifiers sited in other VA300/CAGE(s) if desired, e. g. system fitted with twenty VA300+M amplifiers (slot 21, 22 and 23 are spare) slot 24 is hot-standby for amplifier 1 – 20. Hot-standby amplifier can be assigned for

  • Every seven “on line“ amplifiers
  • Every three “online“ amplifier
  • Single hot-standby can support all “on line“ amplifiers up to maximum of sixty four.

For greater system security the VX/AT-M management processor is not configured to enable hot-standby of all switching functions, alarm generation and operator access unit management. For this application the operator access units feature duplicated N+1 transceivers and microphone transducers. A PSC VODEC NT4 facilitates selection of VX/AT-M on a master/standby basis.



Data Sheet – N+1 Hot-standby System Architecture