4-230

MH89793

Preliminary Information

Figure 2 - Pin Connections

Pin Description

Pin #

Name

Description

1RLA

Received Line A (Input). The A wire or Tip connection of the E1 receive line is connected

to this pin.

2RLB

Received Line B (Input). The B wire or Ring connection of the E1 receive line is

connected to this pin.

3TLA

Transmit Line B (Output). The A wire or Tip connection of the E1 receive line connected

to this pin.

4TLB

Transmit Line B (Output). The B wire or Ring connection of the E1 receive line connected

to this pin.

5TZD2

Transmit Impedance Select. This pin is connected to pin 4 TLB to select 75

Ω impedance.

For 120

Ω operation this pin is left open circuit.

6TZC2

Transmit Impedance Select. This pin is connected to pin 3 TLA to select 75

Ω impedance.

For 120

Ω operation this pin is left open circuit.

7TZA3

Transmit Impedance Select. This pin is connected to pin 9 TZA2 to select 75

Ω

impedance. For 120

Ω operation this pin is left open circuit.

8TZA3

Transmit Impedance Select. This pin is connected to pin 10 TZB2 to select 120

Ω

impedance. For 75

Ω operation this pin is left open circuit.

9TZA2

Transmit Impedance Select. This pin is connected to pin 7 TZA3 to select 75

Ω

impedance. For 120

Ω operation this pin is left open circuit.

10

TZB2

Transmit Impedance Select. This pin is connected to pin 8 TZB1 to select 120

Ω

impedance. For 75

Ω operation this pin is left open circuit.

11

TZD1

Transmit Impedance Select. This pin is connected to pin 4 TLB to select 120

Ω

impedance. For 75

Ω operation this pin is left open circuit.

12

TZC1

Transmit Impedance Select. This pin is connected to pin 3 TLA to select 120

Ω

impedance. For 75

Ω operation this pin is left open circuit.

13

TZA1

Transmit Impedance Select. This pin is connected to pin 9 TZA2 to select 120

Ω

impedance. For 75

Ω operation this pin is left open circuit.

14

NC

No Connection. This pin is used for internal connection.

15

TXA

Transmit A (Input). A unipolar signal from the framer device used in conjunction with TXB

is used to generate the bipolar output signal.

1

2

3

4

5

6

7

21

20

19

18

17

16

15

8

9

10

11

12

13

22

23

24

25

26

27

14

28

RLA

RLB

TLA

TLB

TZD2

TZC2

TZA3

TZB1

TZA2

TZB2

TZD1

TZC1

TZA1

NC

TXA

TXB

NC

NC

NC

VDD

E20

RXB

RXA

VSS

LOS

NC

RZA

RZB