Panasonic Strata Se General Description Manual page 14

STRATA Se/We
GENERAL DESCRIPTION
NOVEMBER 1987
STMU SDTU
SEPU
/
.
FIGURE 17
STRATA Se KEY SERVICE UNIT (with PC&)
and from the station:
b) CO Interface: An interface between the
key service unit and the public telephone
network or PBX for up to two lines
(STRATA Se) or up to three lines (STRATA
Vie). Ring detection, hold and dial outpuls-
ing for these lines are performed by this
board. Depending upon local CO require-
ments, each incoming line can be sepa-
rately connected and programmed to pro-
vide DTMF or rotary-dial outpulsing.
c) Tone: Performs a number of miscellane-
ous system functions:
l
Generates system tones.
,
l
Provides the switching matrix for the de-
livery of tones for both paging and inter-
com connections.
SCCUNCCU: All system control functions are
performed by the single-chip microprocessor
on this printed circuit board. The system pro-
gram stored in ROM, RAM for system opera-
tions, and the RAM for system data storage
are also located on this circuit board. A bat-
tery on this board protects system memory
should a power failure occur.
SCOUNCOU: An optional interface between
the SMAWVMAU and one/three additional
CO line(s). Depending upon local CO require-
ments, the SCOU/VCOU is programmed to
-12-
FIGURE 18
STRATA Vie KEY SERVICE UNIT
(with
PCBs)
provide DTMF or rotary-dial outpulsing. The
SCOU serves one CO line; the VCOU serves
up to three CO lines, and both serve up to
three off-premises lines.
SSTU:
An optional interface between the key
service unit and stations 18 - 25 (stations 14
- 17 on STRATA Se). Each SSTU PCB serves
up to four stations. Two-pair wiring is re-
quired for each station; one pair carrying vo-
ice and the other pair carrying control data to
and from the station.
SMOU:
An optronal music-on-hold source that
provides electronic synthesized music. A
choice of two musical tunes are available, se-
lected via a switch on this board. The SMOU
is connected to the SMAWVMAU via an
8-pin connector.
SEPU:
An optional 3-watt amplifier for external
paging,
using a customer-supplied 8-ohm
speaker (connected to the SMAWVMAU via
a 1 O-pin connector).
SVCU:
The Off-Hook Call Announce interface
that mounts on the main printed circuit board
of the key service unit to provide OCA access.
One SVCU is required for every eight stations
requiring OCA. (Adds two intercom lines if
STRATA We.)