NEC nd-20292 manual Central Control Units CCUs, They can operate as, MDF Co3, Tip, Ring

ND-20292

CHAPTER 2

APRIL, 1990

Refer to section 220.11 of this document for

specifications. Refer to Table ZOO-16 for lead

identifications, and Figure ZOO-8 for station modular jack (RJlJCI W) connection.

STATION

CABLE

For additional CO line connections to additional SLTs, similar cross connections should be made.

Since all of the SLTs must be equipped with DTMF dials, the outside lines must allow tone dialing if dialing during power failure is required. If trunks are Ground Start, then SLTs must be equipped with a ground button.

C. When	SLTs	are installed,		they can operate as
power failure telephones, via cross connection on
the MDF.
co3		SLI-EB		SLT
TIP	-	PT	+--------	TIP
RING	-	PR	+-------	RING

i	I!\			[	MODULAR
i	1	m	1	i	TERMINAL
L---m!			-	- -I

Figure ZOO-8 Modular Terminal for Connection of Multiline Terminals, DSS/BLF, CO Add-On Modules, RAA-E, and SLT

B. Only DTMF dial, Single Line Telephones (SLT), standard 2500 type, are able to dial within the

. Electra Mark11 System. One pair cabling is

required, it is recommended that twisted pair cabling be used.

Refer to Section 220.11 of this document for

specifications. Refer to Table ZOO-16 for lead

identifications, and Figure ZOO-9 for simplified schematic of station termination.

STATION CABLE

R (RD)

TO MDF T (GN) 1

As an example, to have a Single Line Telephone ring on incoming calls to C03, during a power failure, or brownout, connections on the MDF are as shown in Table 200-16.

NOTE: SLTs used for Power Failure Transfer must be supported by an SLI-EB ETU.

SECTION 240

CENTRAL CONTROL UNITS (CCUs)

CONNECTION

240.1 WALL MOUNTING THE CCU

NOTE: UL regulations require the fourth CCU

to always be mounted to the wall, to be provided with a base panel, and never to

be attached to the other three CCUs, when they are also wall mounted.

Mounting of the fourth CCU should be

considered at the beginning but

performed at the end of the CCU wall mounting.

i _ _ _ _ _ _ _ _ &--g-_-----J

RT

SINGLE LINE TELEPHONE

Figure 200-9 Simplified Schematic of SLT Connection

A.The ESE-32B-1 CCU is equipped with two metal wall mounting brackets. These brackets must first be detached from the CCU to properly wall mount the unit.

B.Unscrew the two screws located on the lower portion of the front panel, then remove the front panel by sliding it to the left. Place the panel and screws aside for later reinstallation.

200-18