AT&T System 75 Wiring Diagram page 295

CHAPTER 5. AUXILIARY EQUIPMENT INSTALLATION
89A CONTROL UNIT
Figure 5-12. Loudspeaker Paging With Background Music
Connections—89A Control Unit
Installing Recorded Announcement Equipment
Requirements
Access to recorded announcement equipment is provided by an
information outlet. If the recorded announcement equipment is FCC
registered, the switch side of the cross-connect field is connected
directly to the switch cabinet. If the recorded announcement equipment
is not FCC registered, the switch side of the cross-connect field is
connected to a 36A voice coupler. The 36A coupler is mounted in an
auxiliary cabinet, if one is available. If an auxiliary cabinet is not
available, a connectorized wiring block must be locally engineered to
replace the auxiliary cabinet ED-1E443-10 intra-connection panel.
The switch side of the cross-connect field is connected by the T and R
leads to a TN742 or TN769 analog line circuit pack located in a port
carrier. The TN742 or TN769 circuit pack contains eight ports.
Figure 5-13 shows the connections for the Recorded Announcement
feature when the recorded announcement equipment is FCC registered.
Figure 5-14 shows the connections for the Recorded Announcement
5-22
TO
LOUDSPEAKER
EQUIPMENT
CT
CR
MUSIC SOURCE
CMS2
MUSIC
INPUT
CMS1