E.F. Johnson Company VR-CM50 Manuel de service télécharger pdf (Page 45)

CENTRAL PROCESSOR PACKAGE EQUIPMENT

2-21

February 1996

Part No. 004-3039-273

2.18 TRANSMIT/RECEIVE CHANNEL OPTIONS

The following options describe choices for

CHANNEL CONFIGURATION. Hardware options

generally have an associated cost impact. Software

options are offered at NO CHARGE if specified at the

time of original system order. Hardware modifications

may be required when adding software options to

existing VR-CM50 systems.

2.18.1 TDM-OP301 TONE REMOTE KEYING

TDM-OP301 is a software option which config-

ures a particular channel for tone remote control. All

industry standard control tones from 650 to 2325 Hz

are supported. The control tones for each function

must be specified at the time of order.

2.18.2 TDM-OP302 EXTENDED GUARD TONE

TIMING

Certain radio systems, such as those using RF

links for base station control, may require extended

high-guard tone timing to assure reliable transmitter

keying. TDM-OP302 is a software option which

extends the high-guard timing beyond 125 ms in 25

ms programmable increments to allow for keying

delays introduced by the RF link. The high-guard tone

duration must be specified at the time of order.

2.18.3 TDM-OP303 SEQUENTIAL FUNCTION

CONTROL TONES

The standard tone keying sequence requires a

high level guard tone for 125 ms followed by a single

function tone burst for 35 ms, followed by continuous

low level guard tone for the duration of PTT.

TDM-OP303 is a software option which reconfig-

ures the channel to transmit two (2) sequential 35

msec function tone bursts, following the high level

guard tone burst. This scheme is used by MOTOR-

OLA and others for multi-frequency switching, voice

encryption activation, CTCSS control and other simi-

lar functions. The tone frequencies for each function

must be specified at the time of order.

2.18.4 TDM-OP305 TONE LINE OPERATED

BUSY LED (LOBL)

TDM-OP305 is a hardware option which config-

ures a particular channel to derive channel busy indi-

cation from the guard tone produced by a parallel-con-

nected, tone remote control unit. The option specifies

an applique circuit board which attaches to the Line

Interface Controller (TDM-LIC). The applique uses a

digital 2175 Hz filter which does not require periodic

retuning.

NOTE: This option cannot be used in combination

with TDM-OP311.

2.19 DC CONTROL OPTIONS

2.19.1 TDM-OP311 DC REMOTE KEYING

TDM-OP311 is a hardware option which config-

ures a particular channel for DC remote control. All

industry standard control currents from ±2.5 mA to

±16 mA including pulsed and sustained currents are

supported. The option specifies an applique circuit

board which attaches to the Line Interface Controller

(TDM-LIC) and contains a high voltage DC/DC con-

verter power supply with two (2) programmable con-

trol current regulators.

2.19.2 TDM-OP315 DC LINE OPERATED BUSY

LED (LOBL) [REQUIRES TDM-OP311]

The TDM-OP315 is a software option which con-

figures a particular channel to derive channel busy

indication from the loop keying current produced by a

paralleled connected DC remote control unit. A "sen-

sitivity" control is provided to allow the LOBL to be

optimized for the specific control parameters of each

channel.

2.20 MISCELLANEOUS OPTIONS

2.20.1 TDM-OP318 NON-VOX OPERATED

PATCH

As a general rule, cross-patch is a VOX activated

function that operates on a first-come, first-served

basis. TDM-OP318 is a software option which config-

ures the channel for non-vox patch priority such that

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 83 84

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E.F. Johnson Company VR-CM50 Manuel de service Page 45

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