Tadiran Telecom Coral IPx Office, Руководство по установке и аппаратным средствам, Страница: 391 / 510

Coral IPx Office Installation Manual Shared Service Cards
9-79
Vo
ice Paging
(Public Addr
ess) a
nd Relay-1
Public Addr
ess
9
9.14
Voice Paging (Public Address)
and Relay-1
Public Address
0
The U-RMI Office , U-MR Office, RMI Office and MR Office cards provide one
external paging interface (public address, one port). Station users can access an
external voice paging system connected to the Coral IPx by dialing access code.
Figure 9-17
is a simplified circuit diagram of the Paging Interfaces and the relay
contacts.
Each
U-RMI Office , U-MR Office, RMI Office or MR Office card provides one paging
output: the external voice paging port operates by using both the relay circuit (RLY1)
and the PAGE circuit. The PAGE circuit is used for public address.
The External Paging (PAGE) Interface is electrically identical to the Music interfaces.
Audio signals from the system are passed through the audio coupling transformer to
the interface. A direct current (DC) blocking capacitor protects the secondary winding
of the audio coupling transformer from conducting DC energy. As a music input the
circuit operates as an input only, and so it can be used to play but not record music.
The relay provides form A (single pole, single throw and normally open) contacts for
activating external circuitry and devices. Contacts RLY1 are designated to operate in
conjunction with audio interface PAGE for external paging applications. Care must be
taken not to exceed the contact ratings listed in the specifications.
M2/P Paging/External Music
Page (M2/P) connector can be used as a music source. The selection between the
music source or voice paging output is accomplished by jumper P3 located on the
U-RMI Office, U-MR Office, RMI Office and MR Office cards. See
Figure 9-18
.
Table 9-22
defines the position of P3 for the music selection.
...................................................................................................
1 Introduction
...................................................................................................
2 Circuit Description