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INSTALLATION-SYSTEM DESCRIPTION
SECTION 200-096-202
FEBRUARY1991
PI& 50-PIN
AMPHENOL
CONNECTOR
II
BAUD
\ VRl:
3-WATT
CONNECTOR
LINE
NUMBER
P
LINE
NUMBER
1 “HtARTBEAT”
LED
(PCTUI, 2,3
ONLY)
VRl
MOHIBGM
VOLUME
CONTROL
LINE
PIOU PIOUS
PEPU
PCTU 1,2,&3
PCOU
PCTUS
(17 2)
FlGURE2-14-LOCATIONOFPCBCONTROLSANDlNDlCATORS
PEMU
8.10 Electronic Telephone Upgrade Options
8.11
All electronic telephones may be upgraded
with off-hook call announce, loud ringing bell and
headset capability. Any electronic telephone may
use all available upgrade options simultaneously.
All electronic telephones may be wall mounted
without additional equipment. They are also hear-
ing aid-compatible.
installing an OCA upgrade assembly. The as-
sembly consists of two PCBs, the HVSU and the
HVSI (Figure 2-15), which install inside the
telephone base with plug-in connectors.
NOTE:
Only those telephones programmed to re-
ceive OCA announcements require the OCA
upgrade.
8.12 Each electronic telephone also features a
standard modular handset cord, and is connected
to the system with a 2-pair modular line cord (7-foot
cord included). Various upgrade options, such as
the off-hook call announce and loud ringing bell
upgrade assemblies, require the telephone to be
connected to the system with special wiring. A 3-
pair modular line cord is required for off-hook call
announce, and a custom external speaker cable
(HESC-65) is required for the loud ringing bell.
HVSU and HVSI (Off-hook Call Announce Up-
grade):
Each electronic telephone may be up-
graded to receive intercom handsfree answer-
back calls when the handset is off-hook by
FlGURE2-15-hVSUandHVSl
2-13