Zhone IMACS 8000, Руководство пользователя

Страница: 47 / 788

Reference Guide 2-9
System Installation Ringing Generators
Make sure the system uses a -48V power source before installing any ringing generators.The
chassis can have a maximum of two ringing generators.
When two ringing generators are used, the outputs of all ringing generators are linked together
by OR circuits on the ringing bus. One generator must be jumpered as the MASTER and the
other must be jumpered as SLAVE. The master ringing generator then synchronizes the
ringing signals on the ringing bus. Refer to the system specification section in this manual for
the ringing generators.
2.5.1 Ringing Generators (890620)
Ringing generators are needed if the system has FXS cards, or if it has FXO cards with ports
connected to Manual Ringdown (MRD) circuits. The 20 Hz ringing voltage may be provided
either by an external source or with a Ringing Generator, which requires the presence of -48
VDC in the system. Ringing Generators cannot be used in conjunction with external
ringing sources.
The ringing generators provide a ringing voltage of 105 VAC at 20 Hz for 11 simultaneously
ringing voice ports. Since most systems will not have that much activity, a single Ringing
Generator might provide all of the power necessary to run the system. In a group where
incoming calls are at a minimum, 30 to 50 stations could share the same ringing generator.
Small groups with heavy incoming call volumes might require two Ringing Generators.
CAUTION!
Do not mix different Ringing Generators in the same chassis.
The compatibility of power sources used together are summarized in the system specification
section in this manual.
2.5.2 Installing the 105V Ringing Generator (890620)
CAUTION!
Replacing a Ringing Generator into a powered shelf can cause hits on data circuits.
To install a 105V Ringing Generator, proceed as follows: