2-174

MH88622

Preliminary Information

Figure 2 - Pin Connections

Pin Description

Pin #

Name

Description

1TIP1

Tip Lead. Connects to the “TIP” lead of subscriber line 1.

2RING1

Ring Lead. Connects to the “RING” lead of subscriber line 1.

Battery Voltage. Typically -48V dc is applied to this pin. This should be connected to pin 38

of the hybrid on the PCB.

4

DCRI

DC Ringing Voltage Input. A continuous 120V dc is applied to this input to achieve

90Vrms ringing. This should be connected to pin 37 of the hybrid.

5GND

Ground. This pin should be tied to pins 13, 28 & 36 on the PCB.

6ESI1

External Signal Input (Input). A continuous signal should be applied to this pin which will

be switched to “Tip” and “Ring” of subscriber 1.

7ESE1

External Signal Enable (Input). The external signal to the subscriber 1 is controlled by a

logic level applied to this pin.

8VR1

Receive (Input). 4-Wire GND referenced audio input for subscriber 1.

9SHK1

Off Hook Indication (Output). A logic low output indicates when subscriber 1 equipment

has gone off hook.

10

LCS1

11

VX1

Transmit (Output). 4-Wire, GND referenced audio output for subscriber 1.

12

VEE

Negative Supply Voltage. -5Vdc. Connects to pin 29 of the hybrid on the PCB.

13

GND

Ground. Return path for VDD, VEE, VBat & DCRI. This pin should be connected to pins 5,

28 & 36 of the hybrid on the PCB.

14

VDD

Positive Supply Voltage. +5Vdc. Connect to pin 27 of the hybrid on the PCB.

15

LR1

Line Reversal. A logic 1 applied to LR1 will reverse the “Tip” and “Ring” to subscriber 1.

This pin has an internal pull down.

16

RC1

Ringing Control (Input). A logic level applied to this pin enables ringing to be applied

across Tip and Ring of subscriber 1.

RGV

RG1

NC

NC

RC2

LR2

VDD

GND

VEE

VX2

LCS2

SHK2

VR2

ESE2

ESI2

GND

DCRI

VBat

RING2

TIP2

TIP1

RING1

VBAT

DCRI

GND

ESI1

ESE1

VR1

SHK1

LCS1

VX1

VEE

GND

VDD

LR1

RC1

NC

NC

RF1

RF2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40