GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 94)

Parameter Modification PL1877A Microprocessor Radio Telephone Interconnect
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Telephone Interface
Parameter Function
163 Off-hook voltage threshold is 25 V = 0
Off-hook voltage threshold is 15 V = 1
Allow user to manually set off-hook voltage threshold via test 6 (or programming
software) = 2
Default = 0
This parameter is required for determining the off-hook voltage threshold on the
PL1877A’s phone line. This allows the PL1877A to determine when an attendant (line-
sharing) telephone is in use.
Program parameter 163 to 0 for a phone line that provides a 48 V talk battery.
Program parameter 163 to 1 for a phone line that provides a 24 V talk battery.
If the phone line provides substantially less than 24 V of talk battery, it may be necessary
to manually program the off-hook threshold via test 6 (or via the programming software).
If so, program parameter 163 to 2.
123 Number of rings that PL1877A must receive before generating ring signaling to mobile.
Valid range = 1–9.
Default = 1
This parameter is used to delay ring signaling to the mobile long enough for an attendant
to answer the call via a line sharing telephone.