NEC nd-20292 manual Odb, On = 2db, On=, 4db, On = 8db

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When a loop start trunk is connected to a circuit, its

:associated switch must be set to the LP position. If a ground start trunk is connected, the switch must be set to the GD position.

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OLEDlOl	c
OLED201	I?
OLED301
OLED401
OLED 1

ND-20292

CHAPTER 2

APRIL, 1990

Switches designated SW301, SW302, SW401 and SW402 are four position dip switches used to select loss level for loop dial, DID, 2 and 4 wire E&M Tie lines. Loss levels can be adjusted for 0, 2, 4, 8, 12 or 16 db. (See Figure 200-21).

SW301 sets the transmission loss level for Channel 1.

SW302 sets the reception loss level for Channel 1.

SW401 sets the transmission loss level for Channel 2.

SW402 sets the reception loss level for Channel 2.

ON $	‘00”’	;jirp	,‘DE?p	y;,	y,
OFF

E 1

Figure 200-20 COT-E ( ) Switch Layout

1 mON

2 m

3 mON

4 =

Figur: 200-21

	All switches OFF			=	Odb
	Switch	1 ON =			-2db
ON	Switch	2	ON=		-4db
	Switch	3	ON =		-8db
ON	Switch	4	ON =		-12db
	All switches ON			=	-16db

SW3<1, SW302 SW401 or SW402 pad switch settings bn TLI-E ETU

LED1 (Green) lit, indicates that the COI-E is receiving B power.

LEDs 101-401 (Red) indicate the status of the fou r

associated circuits. Each LED ON indicates it associated circuit is in use.

A maximum of ten COI-E ETUs can be installed in ; system, into any interface slots.

B.COI-EB ETU

This Central Office Interface ETU provides the same services as the COI-E ETU, in addition it supports the

CENTREX ringing feature. (CPU-EB3 or highe revision level ETU is also required.)

f

C. TLI-E ETU

The TLI-E ETU provides circuitry for servicing up to two dial pulse lines; DID, Loop Dial, 2 or 4 wire E&M Tie lines. It contains ten switches and three LEDs.

Switches designated SW101 and SW201 are used to select the type of E&M Tie lines (2 or 4 wire).

NOTE: When Loop Dial /DID lines are connected, these switches must be set to the 2 wire position.

Switches designated SW102 and SW202 are used to select the type of lines (DID /Loop Dial or E&M).

Switches designated SW103 and SW203 are used to select the type of E&M signaling (type I or V) for E&M Tie lines being used.

LEDs 1 and 2 (Red) indicate the status of the associated two circuits.

Each LED ON indicates its associated circuit is in use.

LED 3 (Green) lit, indicates the TLI-E ETU is receiving power.

A maximum of twenty TLI-E ETUs can be installed in a system, into any interface slots.

D. TLI-EB ETU

The TLI-EB ETU provides circuitry for servicing up to two lines; 2 or 4 wire, Dial Pulse or DTMF, E&M Tie lines. It contains six switches and three LEDs.

Switches designated SW101 and SW201 are used to select the type of E&M Tie lines (2 or 4 wire).

NOTE: Loop Dial/DID lines can not be connected to this type ETU.Switches designated SW102 and SW202 are eight position dip switches used to select loss level for the 2 and 4 wire E&M Tie lines. Loss levels can be adjusted for 0, 2, 4, 8, 12, or 16 db. (See Figure 200-22).

Switches designated SW103 and SW203 are used to select the type of E&M signaling (type I or V) for E&M Tie lines being used.

SW102 (Switches l-4) sets the transmission loss level for Channel 1.

200 - 25