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TPARC Design Principles |
TPARC adopted some key principles in designing the BC Digital Emergency
Services Network:
- The network must be simple to use and not require the user to issue multiple
connect requests to connect to a remote station. (Unlike the method used in
NetRom where every station along the route must be entered correctly and in order.)
- The Network must allow access using a minimum configuration such as might
be obtainable during an emergency situation.
- The Network must intelligently route calls and create and maintain virtual
circuit connections. The user need only know a minimum amount of information to
use the Network.
- The Network must be able to interconnect with other existing and future
digital networks regardless of the difference in networking protocols.
- Network trunks must operate in full duplex to maximize the network throughput.
- The Network switches (modems) must be remotely controlled.
- All Network switches must contain sufficient testing and diagnostic
routines to allow for remote testing and maintenance.
- All devices at all sites must be remotely controlled.
- All digital devices must operate from an uninterruptible power supply.
- All radio frequency devices must have standby power.
- Where possible, all user access drops must operate through wide coverage
repeaters with overlapping footprints to allow maximum coverage and create
multiple network access points from any user location.
- All access drops (repeater sites) must operate through repeaters to
eliminate hidden transmitter syndrome.
- All access drops must regenerate packets before retransmission to reduce
drop frequency congestion due to retries of over or under deviated AFSK
signals from user stations.
- Network digital trunk switches (modems) must be upgradeable to 56k baud.
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