NEC nd-20292 CBL-E Unit, Coi-E Etu, Coi-Eb Etu, Tli-E Etu, Tli-Eb Etu, Esi-Ea Etu, Esi-Eb Etu

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.			‘Y\
				2,
				‘:l
NOTE:	It is recommended that		the ESI-EA ETU be	1’-‘.
	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.

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.

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