Tii 79 User Manual

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141 Rodeo Drive tii 78 / 79 Series
Edgewood, NY 11717 Dual Service Provider Switch
Customer Service/Sales 888-844-4720 02/08 Rev B

INSTALLATION NOTE

1. GENERAL DESCRIPTION

1.1 The TII 78 and 79 Series are designed for
applications requiring more than one service provider
which requires a connection to a single tip-ring pair. It
offers one or more outputs for the customer premises
telephone wire termination.

2. WARRANTY

2.1 See TII Warranty. If this unit fails during the
warranty period, the factory should be requested to
authorize return. Return the unit prepaid. Units that fail
due to normal wear or abuse should be discarded.

3. INSTALLATION

3.1 Remove the Dual Service Provider Switch
from plastic bag and inspect; if damaged, replace with
an undamaged switch.

3.2 Installation is accomplished using standard
technician tools. The Insulation Displacement
Contacts (IDC) are achieved using gel sealed
rockers.

3.3 IDC Terminations accept 26-22 AWG solid wire.

3.4 Locate a suitable flat, dry area to install the unit.
Use a size #8 screw to mount the unit. Install the TII
78 Series Termination Block. See Figure 1.

3.5 The 78 switch can be installed within an indoor /
outdoor listed housing. Use suitable hardware to
attach the block to the mounting service.

3.6 The 79 switch mounts in the customer
compartment of a TII 5100 NID. See Figure 2.

3.7 Lower the 79 switch into the 5100 NID and align
the locating fingers with the locating slots. Press down
until unit locks into locking tab. See Figure 3.

4. WIRING

4.1 Provides three pair customer wire terminations
with very low insertion loss from input to output.

TII 78

TII 79

Do not strip wire insulation from wires to be
terminated to Switch.

TII 78 Wiring

Tip (Green)

Digital Voice

Service In

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Wire Loom

MTA Input

3 Pair Telco Input

Ring (Red

RJ-11 Interface

Mounting Hole

Customer Wire Telco

Output Terminations

Test Points

FIGURE 1

NOTE: IDC’s accept 22-26 AWG solid wire. Wires
should be aligned to the corresponding holes.
Green wire to the “T” (GRN) labeled wire guide
and the Red wire to the “R” (RED) labeled wire
guide.

TII P/N 92225101

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Telco Service

4.2 Wire spaded lugs to the corresponding Telco
Service Input.

4.3 Insert the RJ-11 interface plug into the 3 pair
Telco input receptacle.

4.4 Insert wires into customer wire guides at the
same time until they bottom out. While holding
wires in wire guides, terminate rocker with thumb
(lower rocker all the way).

4.5 Terminate additional wire pairs to the remaining
rockers as required.

VoIP Service

4.6 Connect the Digital Voice Service Input wires to
the Blue MTA rocker, following step 4.4.

4.7 Insert the RJ-11 interface plug into the MTA input
receptacle.

4.8 Insert wires into the customer wire telco output

rockers as required.

5. TESTING

5.1 Test for line continuity using the test points. (Figure

1).

TII 79 Installation

FIGURE 3

Tip (Green)

Test Points

Ring (Red)

MTA Input

3 Pair Telco Input

TII 79 Wiring

Locating Fingers

Customer Wire Telco

Output Terminations

FIGURE 2

Digital Voice

Service In

Locking Hinge

RJ-11 Interface

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TII P/N 92225101