System Overview
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SmarTrunk II vs. LTR Comparison Table
The following table summarizes some of the major similarities and
differences between SmarTrunk II and LTR.
Feature/Specification SmarTrunk II LTR
Type of voice modulation Analog Analog
Subscriber equipment Conventional two way radios Specialized LTR subscriber radios
equipped with add-on logic boards
Type of signalling Digital BPSK audible databurst at call setup Continuous sub audible digital signalling
Method of trunking management Mobile scan based Home channel controlled
Channel acquisition Call takes place on one ch. after initial setup Radios acquire a new ch after each PTT
Initial call set-up time Approx. 1- 3 seconds Approx. 300 milliseconds
Subsequent PTT access time during the same call Instantaneous Approx. 300 milliseconds
Home group dispatch Push to talk (PTT) access Push to talk (PTT) access
Individual selective calling Ye s Limited - each call must be pre-programmed
Telephone interconnect Yes Optional
Secure against system pirates or unauthorized use Ye s N o
Co-channel tolerant Ye s Limited - home channels must be
assigned to clear channels
Can operate in parallel with a conventional tone panel Ye s Limited - home channels cannot
support parallel tone panel operation
Group inhibit Ye s Ye s
Selective calling inhibit Yes Limited - must be pre-programed
Call record accumulation Ye s Ye s
Number of different subscriber IDs per system Up to 4,096 Up to 250 per home channel
Remotely Disable Individual Radios Yes No-Groups only
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