ADTRAN specifications TA 850 Backplane Connections, Use wire gauge suitable for the application

Table 1. TA 850 Backplane Connections

Ref Des	Device/Label	Technology
P1	wire-wrap strip	clock/tests
P2	50 pin amphenol	FXO, FXS, etc.
P3	wire-wrap strip	alternate T1 interface
P5	wire-wrap strip	alarms
P6	4 pin jack	primary -48 V in
P7	3-lug terminal	alternate -48 V in
JP1	RJ-48/E-NET	10BaseT Ethernet
JP2	RJ-48/T1	primary T1 interface
JP3	RJ-48/FT1	DSX1 interface
JP4	RJ-48/MAINT	RS 232 craft interface
J1	V.35	Nx56K/64K

UL 1950 Deployment Guidelines. One of the follow- ing two powering schemes shall be used when power- ing this equipment:

1.Use the ADTRAN power supply (part number 1175043L1).

2.Do the following:

a. Connect the unit to a reliably grounded -48 Vdc source which is electrically isolated from the AC source.

b.A readily accessible disconnect device, suitably approved and rated, shall be incorporated in the input source wiring.

c. The branch circuit overcurrent protection shall be a fuse or circuit breaker rated minimum 48 V, maxi- mum 20 A.

d.This unit shall be installed in accordance with the requirements of NEC NFPA 70.

The installation configurations codes are given below:

	In	Out
PC	F	C
IC	E	-
TC	X	X

CAUTION

Both Power and T1 services have two connection points. In all cases, only one of the connection points is used. Adhere to the instructions in the following subsections to ensure correct installation.

Alternate Connections. For wire-wrap or screw terminal connections, the rear cover does not need to be removed; only the terminal access cover needs to be removed. Make wire-wrap or screw terminal connections as follows:

1.Unscrew the access cover hold-down screw.

2.Slide the access cover down slightly to disengage the lock-tabs from their slots.

CAUTION

Use wire gauge suitable for the application.

3.Identify the wire-wrap pins designated for use, and make the connections starting with the pins closest to the exit port to avoid wiring interference as work progresses.

4.If alternate power connection to P7 is to be used, make those terminal connections last.

5.Carefully route wiring through the exit port.

6.Position and align the access cover tabs to the slots; insert the tabs and slide the cover up slightly until the screw holes are aligned. Ensure that exit wiring is not pinched or damaged.

7.Reinsert the hold-down screw.

Customer Connection. One 50-pin male amphenol connector (P2) provides the interconnect wiring for the access modules located in slots 1 through 6 of the chas- sis. This connector is usually terminated with a punch- down block for premises wiring or connected directly to a cross-connect or main distribution frame. Figure 4 on page 5 details the connector pinout.

T1 Connection. There are two termination points for connecting the network T1 to the chassis: the primary RJ-48 connector (JP2) and the alternate wire-wrap pins on terminal strip P3 (as shown in Figure 2 on page 2).

Only one connector type is used (not both).

The T1 primary connection is via the RJ-48 connector labeled T1 (JP2). This arrangement provides a convenient T1 connec- tion for those installations where a T1 Smart Jack is used.

The RCU common module provides termination for DSX-1 and DS1 signals. For wire-wrap connections, shield is provided by the ground pin adjacent to the DSX-1/DS1 pin set (see Figure 5 on page 5). Line build-out and equal- ization settings are provisioned on the RCU.

Power Connection. There are two power connec- tions on the backplane: a modular DC plug (P6), and a three lug terminal strip (P7). (Refer to Figure 2 on page 2.)

The primary connection is the modular plug, which receives -48 VDC from the ADTRAN power supply/ battery charging unit (P/N 1175043L1). The alternate

4 Issue 2, June 2000 61200376L1-5B