Att System 25 Manuel d'utilisateur télécharger pdf (Page 121)

INSTALLATION

Connect the cable to a protection device at the System 25 location.

5. Connect the second protection device to an 858A Adapter on the617A

Panel, using 4-pair inside wiring cable.

6. Connect the 858A Adapter to a port on a TN742 circuit pack using an

octopus cable.

Out-of-Building Voice Terminals (ZTN79)

Transmission facilities (voice pairs) that extend out-of-building and are not

included in the interface may be installed by the telephone company or through

other means (e.g., the building and/or property owner). These facilities, aerial or

buried, must be protected with voltage limiting devices and sneak current fuses.

The only exception to this rule is buried cable that is enclosed in a continuous

metallic conduit from one building entrance to the other. In this case, the conduit

must be connected to an approved building ground at each end.

If single-line terminals are extended out-of-building, standard protection devices

fcr voice pairs should be used. If 7300 H-type voice terminals are extended out-

of-building, the facilities must be protected with an In-Range Out-Of-Building

(I ROB) Unit Tll Model-343, PEC 32918, Comcode 406-106-583 at each end.

Terminals J1-3 and J1-6 of the IROB Unit should not be connected. Maximum

distance between a 7300H voice terminal and the system 25 cabinets is 2000

feet. There is no limit on how much of the 2000 feet may be locally powered

using the DS181 522 Kit-of-Parts, Comcode 105-105-514. (Only ZTN79 CP

supports 7300 H-type voice terminals. Secondary wiring protectors are listed in

Table 2-B.)

Off-Premises-DS1 Interface

The TN767 DS1 Interface can support up to 24 analog off-premises stations

through the use of a D4 channel bank.

Make the connections shown in Figure 2-41 at the S25. The CSU can be

and GRD leads are optional according to how the CSU is powered. For the

connections at the D4, refer to the D4 installation document (555-170-102).

Secondary wiring protectors are listed in Table 2-B.

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Att System 25 Manuel d'utilisateur Page 121