Vitec Multimedia CellCom 10, Инструкция по эксплуатации

Страница: 28 / 90

C E L L C O M 1 0 W I R E L E S S C O M M U N I C A T I O N S Y S T E M
4 - 4
CONNECTING TO PARTY-LINE INTERCOM SYSTEMS
Up to two channels of party-line intercom can be connected to the CellCom 10
base station. The descriptions below will discuss connections with Clear-Com
and compatible party-line, RTS party-line, the ability of CellCom 10 to power a
few Clear-Com beltpacks by itself, and the front-panel settings associated with
these party-line connections.
Using the front-panel display and rotary encoder, the user may go into the
PORTS menu, select the desired party-line channel, and create a five-character
alphanumeric label for it. This is the label that would then appear on any
CellCom 10 wireless beltpacks to which that party-line connection was assigned
for communications. In the GROUPS menu, the party-line connection can be
assigned as a member of any of the groups, as desired.
CLEAR-COM AND COMPATIBLE PARTY-LINE
Clear-Com and Clear-Com-compatible wired party-line intercoms connect to
the PL CH-A and PL CH-B connectors in a similar manner to connecting
beltpacks or remote stations to the intercom line. Typically that wired intercom
connection would have a 30-VDC current on Pin 2, coming from a main station
or an intercom power supply. The second connector in the pair may be used as a
loop-through to go to other wired party-line stations or beltpacks, or to a second
CellCom 10 base station.
To connect party-line equipment to the base station:
1. Check that the party-line LED on the front-panel is out, which indicates that
the party-line connection is disabled from the base station.
2. Connect, and if appropriate, power up, the external party-line equipment.
3. Enable the party line by pressing the “enable” button on the base station’s front
panel.
The base station detects power and termination settings when you enable the
party line by pressing the “enable” button on the base station’s front panel, or
when the base station is powered up after having enabled the party line. The base
station remembers that the party line is enabled when it powers up.
When the CellCom 10 base detects a wired party line being connected with 30
VDC on Pin 2, it automatically disables the 200-ohm termination on that
connector, and also does not enable the 24-VDC power supply that the CellCom
10 base station supplies to the connector to support a handful of locally
connected wired party-line beltpacks. The base station then appears to the wired
party-line system as a remote station.
Note: An audio tone of moderate level is injected into the party-line when it is
enabled, to calibrate the auto-nulling circuitry. While this should not be of sufficient
level to cause damage to persons or equipment, you may wish to disconnect or turn
down audio outputs from the party-line equipment when powering on the base
station, or enabling the base station party-line channel.