ADTRAN 850 specifications Connector Pinout

connection is screw terminal P7, which can be used if -48 Vdc is available as in central office applications. The screw terminal connection is shown in Figure 6 on page 5.

CAUTION

During installation, power should be the last connection made after all other wire-wrap connections are completed.

25	50	NC
	P
		R
24	49		Circuit 4
		T
	P
		R
23	48		Circuit 3
		T
	Slot 6
	P	R	Circuit 2
22	47
		T
	P
		R	Circuit 1
21	46
		T
	P
		R
20	45		Circuit 4
		T
	P
19		R	Circuit 3
	44	T
	Slot5
18	P	R	Circuit 2
	43	T
	P
		R	Circuit 1
17	42
		T
	P
16		R	Circuit 4
	41	T
	P
		R	Circuit 3
15	40
		T
	Slot 4
14	P	R	Circuit 2
	39	T
	P
13		R	Circuit 1
	38
	P	T
12		R	Circuit 4
	37	T
	P
11		R	Circuit 3
	36	T
	Slot 3
10	P	R	Circuit 2
	35	T
	P
9		R	Circuit 1
	34	T
	P
8		R	Circuit 4
	33	T
	P
		R	Circuit 3
7	32
		T
	Slot 2
6	P	R	Circuit 2
	31	T
	P
5		R	Circuit 1
	30	T
	P
		R	Circuit 4
4	29
		T
	P
3		R	Circuit 3
	28	T
	Slot 1
2	P	R	Circuit 2
	27	T
	P
1		R	Circuit 1
	26
		T

50 PIN

AMP

RECEPTACLE

Figure 4. Connector Pinout

To DSX-1/DS1

							20 AWG
16 AWG
RING LUG						RING LUG
	RED		BLK	BLK
16 AWG					20 AWG
STRANDED					SOLID
				FG
	-48V		GRD
		TO FUSE		TO WIRE WRAP
		PANEL		FRAME GROUND

Figure 6. Alternate Power Connection

NOTE

The following section is for information only, and the features described are not necessary for typical applications.

Office Alarms. Backplane alarm connections (P5) are labeled as shown in Table 2 on page 6 and illustrated in Figure 7 on page 6. Alarm relay contacts are open dur- ing normal operation. The alarm relay contacts close in the event of a local alarm condition or the receipt of an alarm from the T1 carrier. In a carrier alarm condition such as a Red, Yellow, or Blue (unframed all 1s), various alarm contacts in the PSU close. Carrier alarm condi- tions cause the TA 850 to initiate trunk processing. The following chain of events then occur:

1.MJ will be directly shorted to MJR.

2.MJV will be directly shorted to MJVR.

Contacts MJ and MJR can be overridden manually dur- ing an alarm condition by pressing the ACO pushbut- ton on the PSU faceplate. If the 3-Amp power fuse on the PSU trips, the -48ALM relay will close, providing a -48 VDC signal on that pin. This alarm cannot be over- ridden by the ACO pushbutton. Refer to Table 3 on page 6 for alarm notifications.

R1 T1 R T

Figure 5. T1 Connections

61200376L1-5B Issue 2, June 2000 5