Specifications

2-8 Reference Guide
Model No.
Running Head
Power Supplies and Ringing Generators System Installation
2.2.1.2 Ringing Generators
Ringing generators are needed if the system has FXS or FXS-C cards, or if it has FXO or
FXO-C 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. Two Ringing Generator models are available
(105 VAC output and 100 VAC output).
These Ringing Generators cannot be used with
external ringing devices.
The 105V (nominal) unit provides a ringing voltage of 105 VAC at 20 Hz for 11
simultaneously ringing voice ports. The 100V unit similarly provides 100 VAC for the same
number of 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 or more Ringing
Generators. This card will not “quit” with a heavy load, it will just have weaker and slower
ringing abilities. This condition should alert you to the need for additional equipment.
CAUTION!
Do not mix 100V and 105V Ringing Generators in the same chassis.
The compatibility of power sources used together are summarized in the system specification
section in this manual.
2.2.1.3 Setting the U.S./European Configuration Jumper
Before inserting any cards into the chassis, set its JP1 jumper for either the U.S. or European
configuration. This jumper is shown in Figure 2-5; it is on the resource card backplane and is
accessible from the chassis front. The default jumper setting is
US
(for systems in the U.S. and
Canada). To change the chassis electrical configuration for European compliance (
EUR
),
move the jumper to pins 2 and 3.
Figure 2-5. JP1 Jumper Settings
1
2
3
JP1
EUR/US
1
2
3
JP1
EUR/US
U.S. Configuration Eurpoean Configuration