MH88632BT Ver la hoja de datos (PDF) - Mitel Networks

Número de pieza

componentes Descripción

Fabricante

MH88632BT

Central Office Interface Circuit

Mitel Networks 

Preliminary Information

MH88632B

Pin Description (continued)

16

BRC Bias Relay Control (Input). A logic 1 activates BRD. The Bias Relay (K2) is used to

connect Tip and Ring to -48V via bias resistors. This input should be connected to logic 0

when not used.

17

GRC Ground Ring Relay Control (Input). A logic 0 activates GRD. The Ground Ring Lead

Relay (K3) is used to connect Ring to AGND via a bias resistor. This input should be

connected to logic 1 when not used.

18

AGND Analog Ground. 4-Wire Ground. Normally connects to system ground. This pin must be

connected to the system ground in Ground Start applications.

19

NATT Network Balance AT&T Node. Used when setting the Network Balance Impedance to

AT&T compromise network.

20

N1 Network Balance Node 1. Used when a Network Balance Impedance which differs from

the Input Impedance is required or when NATT is used.

21

N2 Network Balance Node 2. Used when a Network Balance Impedance which differs from

the Input Impedance is required.

22

Z900 Input Impedance 900Ω Node. Connects to Z1 when selecting an Input Impedance of

900Ω.

23

Z1 Input Impedance Node 1. Used when setting the Input Impedance.

24

Z2 Input Impedance Node 2. Used when a user defined Input Impedance is required.

25

TX Transmit (Output). 4-Wire ground (AGND) referenced analog output.

26

RX Receive (Input). 4-Wire ground (AGND) referenced analog input.

27

GTX0 Transmit Gain Node 0. Connects to GTX1 for 0dB transmit gain.

28

GTX1 Transmit Gain Node 1. Connects to GTX0 for 0dB transmit gain or via a resistor to AGND

for transmit gain programming.

29

GRX0 Receive Gain Node 0. Connects to GRX1 for 0dB receive gain.

30

GRX1 Receive Gain Node 1. Connects to GRX0 for 0dB receive gain or via a resistor to AGND

for receive gain programming.

31

IC Internal Connection. No connection should be made to this pin.

32

Z600 Loop Impedance 600Ω Node. Connects to Z1 when selecting an Input Impedance of

600Ω.

33

NS Network Balance Setting (Input). Used to select the Network Balance impedance.

34

TG Tip Lead Ground Detect (Output). A logic 0 output indicates that the Tip lead is at ground

(AGND) potential.

35

RL Reverse Loop Detect (Output). In the on-hook state, a logic 0 output indicates that

reverse loop battery is present. In the off-hook state, a logic 0 output indicates that reverse

loop current is present.

36

RV Ringing Voltage Detect (Output). A logic low indicates that ringing voltage is across the

Tip and Ring leads.

37

FL Forward Loop Detect (Output). In the on-hook state, a logic 0 output indicates that

forward loop battery is present. In the off-hook state, a logic 0 output indicates that forward

loop current is present.

38

RG Ring Lead Ground Detect (Output). A logic 0 output indicates that the Ring lead is at

ground (AGND) potential.

39

VEE Negative Supply Voltage. -5V DC

40

VCC Positive Supply Voltage. +5V DC

2-241

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