AT&T 3.0 manual Wiring, Network Interfaces Description Adapter

Wiring

Wiring

The local telephone company should have installed the network interface (the central office trunks) already. Before you install the system, verify that the network interface is the proper type and that it is within 25 ft. (7.6 m) of the control unit. If the network interface is more than 25 ft. (7.6 m) from the control unit, make sure you have an OPRE.

The adapter you need to connect the central office trunks to the control unit depends on the type of network interface installed, as shown in Table 4-1.

Table 4-1. Network Interfaces

Network
Interface	Description	Adapter
RJ11	Connects one outside ground-start (GS),
	loop-start (LS), or Direct Inward Dial (DID)
	trunk to one modular jack.
RJ14	Connects two outside trunks to one modular	2-line adapter (267C-type)
	jack (GS, LS, or DID).
RJ21X	50-pin connector connects 25 110AB1 jack-	110AB1 jack-panel block
	panel block to outside trunks (GS, LS or DID)
RJ2GX	50-pin connector for up to eight tie trunks	356A for eight or fewer tie
		trunks; 259A for one tie trunk
RJ48C/X	Connects DS1 facilities to a four-pair jack	Z601A if modular cords are
	(two active pairs).	used

After installing the adapter, label each jack that connects a central office trunk to the control unit with the trunk’s number. Use the list provided by the local telephone company or System Form 2c, System Numbering: Line/Trunk Jacks for outside trunks as a reference.

4-2Connecting the Control Unit to the Network Interface