user manual

ND-20292
CHAPTER 1
APRIL, 1990
To connect MOH and BGM sources, the TSW-EB ETU
houses audio digitizer circuits to change analog signals
to digital signals.
12. CBL-E UNIT
This unit provides the required interconnecting cables
to install the fourth CCU. The CBL-E is shipped with
a special template to facilitate the wall mounting of
the fourth CCU.
13.
COI-E ETU
The COI-E ETU is the Central Office Line Interface
Unit that contains circuitry for outside ring detection,
hold, dialing, and control function.
Each COI-E ETU provides four identical circuits to
serve up to four CO trunks which can be any mix of
Loop Start or Ground Start Trunks, DTMF or dial
pulse dialing.
A maximum of ten COI-E ETUs can be installed per
system.
14.
COI-EB ETU
This Central Office Interface ETU is the same as the
COI-E ETU except this ETU supports the Centrex
Ringing feature.
15.
TLI-E ETU
The TLI-E ETU provides for the termination and
operation of up to two lines that can be E&M Tie Lines
(loop dial, 2 or 4 wire E&M, Type I or Type V) and
DID line (10~~s pulse dial). Wink, delayed, second dial
tone or immediate start loop signaling are supported
along with the possible terminations accommodated
with the COI-E and TLI-EB ETUs. The system
maximum of 40 outside lines is observed.
16. TLI-EB ETU
The TLI-EB ETU provides for the termination and
operation of up to two lines, that can be E&M Tie Lines
(2 or 4 wire E&M, Type I or Type V). DTMF, Dial
Pulse, Wink start, delayed dial, second dial tone or
immediate start loop signaling are supported along
with the possible terminations accommodated with the
COI-E and TLI-E ETUs. The system maximum of forty
outside lines is observed.
17. ESI-EA ETU
The ESI-EA ETU is the Electronic Station Interface
Unit required to provide data control and voice service
to the Multiline Terminals without the off-hook
announcement feature. It can also accommodate the
DSSIBLF Console and CO Add-On Modules.
Each ESI-EA ETU contains four identical circuits to
serve up to four Multiline Terminals which can be any
mix of Multiline Terminals, DSSIBLF Consoles, RAA-
E unit, or CO Add-On Modules.
NOTE: It is recommended that the ESI-EA ETU be
the only Multiline Terminal Interface card
installed in the fourth CCU. The fourth
CCU cannot support the additional
features supported by the ESI-EB ETU.
‘Y\
2,
‘:l
-‘.
1’
A maximum of twenty ESI-EA ETUs can be installed
per system.
18. ESI-EB ETU
The ESI-EB ETU is the Electronic Station Interface
Unit which includes the functions of the ESI-EA ETU
and supplies the Multiline Terminals (when a DPA-E
and/or a DTA-E Unit is installed), with the off-hook
announcement and/or Data Communication features.
Each ESI-EB ETU contains four identical circuits to
serve up to four Multiline Terminals which can be any
mix of Multiline Terminals, DSSIBLF Consoles, RAA
unit, or CO Add-On Modules.
NOTE 1: The Data Switching feature has a direct
impact on the Dud Path features’ system
maximum and vice versa. When a station
requires both Dual Path and Data -\,,
Switching it needs the use of three paths :,
(each ESI-EB ETU contains 8 paths .”
utilized by the four ports) therefore,
removing the second path from the
adjacent port. Only ports one and three of
the ESI-EB ETU can have both features,
while ports two and four can have either
feature (if the adjacent port does not have
both).
NOTE 2: It is recommended that the ESI-EA ETU be
the only Multiline Terminal Interface card
installed in the fourth CCU. The fourth
CCU cannot support the additional
features supported by the the ESI-EB ETU.
A maximum of twenty ESI-EB ETUs can be installed
per system.
19. SLI-EA ETU
The SLI-EA ETU is the Single Line Telephone
Interface Unit which provides circuitry for loop status
detection, talk battery, sending ringing signal from the
RSG-E Unit to SLTs, and voice service to SLTs.
Each SLI-EA ETU contains four identical circuits to
serve up to four SLTs.
100 - 26