NEC nd-20292 manual Tsw-Eb Etu, Mmc-E Etu, Cpu-E

ND-20292

CHAPTER 2

APRIL, 1990

Switch labeled MELODY (SW31 is used to select one of two melodies from the internal MOH music chip, mounted on the TSW-E ETU. VRl is used to adjust the volume of the melody provided by the melody chip.

RCA hono plug EP provides External Pa e common audlb3 e and is used for connection of a local f y provided amplifier for external paging.

RCA phono plug MOH is used for the connection of an external MOH source, ifneeded.

The TSW-E ETU must be installed in the TSW slot in the ESE-32B-1 CCU.

D.TSW-EB ETU

The TSW-EB ETU provides the same services as the TSW-E ETU. The TSW-EB ETU has one green LED

which flutters during normal operation and is equipped with an additional connector (CN3) for the interfacing with the fourth cabinet’s MMC-E ETU via the CBL-E expansion cable unit.

E. MMC-E ETU

The MMC-E ETU contains one switch, two LEDs, one

cable	and	one connector.				Switch 1 (SW11			is	the reset
switch.		Depression		of	this	switch		causes	all	service
associated		with	the CCU			to	be	interrupted.		This
switch	should		not	be	used in		an	operating		system
unless	absolutely		necessary.

The LEDs indicate module memory working status. Under normal operating conditions, they flutter to

indicate memories being activated. When SW1 is depressed, the LEDs momentarily turn OFF. When the CCU is disabled, the LEDs are constantly OFF.

The flat cable must be connected to either connector on the TSW-E( ) ETU or another MMC-E ETU. When it is connected to another MMC-E ETU, the cable of that MMC-E ETU must be connected to the TSW-E ETU (See Figure 200-19).

The MMC-E ETU must be installed in the MMC slot of an ESE-32E-1 CCU.

240.5 BASIC INTERFACE ETUs

Although the system scans all slots to detect which

devices	are	installed,			it	must be noted that this is only
performed		by	the	CPU-E(			1	ETU	during	initial
powering		up	of	the		system,		or	after	a first
initialization.			At	this		time,	all	busy	switches,	on all
interface	ETUs,		must		be set		to the	ON	position.

Thereafter, if any device is installed and the system is

not turned off or a first initialization is not performed, you must inform the system (via programming) of the location and type of device added.

Figure 200-19 4 Module CCU Layout (Floor Mounted)

a.Prior to inserting (or removing) an ETU into

an interface slot, as determined by the Job Specification, ensure the busy switch (SW11 on that ETU is in the OFF position.

b.Insert the ETU into a vacant interface slot, ensuring the components are on the right side.

c.Set the busy switch (SWl) on that ETU to the ON position.

Each basic interface ETU has a busy switch (SWl), a power LED (Green) and may have two or four status LEDs (Red).

Setting the busy switch (SW11 to the ON position, after inserting the ETU, causes the power LED to light.

The red LEDs indicate the status of circuits. Each LED ON indicates that its associated circuit is in use. Refer to Table 200-17, Interface ETU LED and Switch Reference.

type. Each switch is associated with a circuit.

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