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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