MH88632 Ver la hoja de datos (PDF) - Mitel Networks

Número de pieza

componentes Descripción

Fabricante

MH88632

Central Office Interface Circuit

Mitel Networks 

Preliminary Information

MH88632

Pin Description (Continued)

Pin # Name

Description

16

BRC Bias Relay Control (Input). A logic high activates the Loop Relay Drive output (BRD),

used for Ground start applications only. This input should be connected to logic high when

not used.

17

GRC Ground Ring Lead Relay Control (Input). A logic low activates the Ground Ring Lead

Relay Drive output (GRD), used for Ground Start applications only. This input should be

connected to logic high when not used.

18

AGND Analog Ground. 4-Wire ground. Normally connected to System Ground.

19

NATT Network Balance AT+T Node. Connects to N1 for a network balance impedance of AT&T

compromise (350Ω + 1kΩ // 210nF); the device’s input impedance must be set to 600Ω.

This node is active only when NS is at logic high. This node should be left open circuit when

not used.

20

N1 Network Balance Node 1 (Input). 0.1 times the impedance between pins N1 and N2 must

match the device’s input impedance, while 0.1 times the impedance between pins N1 and

AGND is the device’s network balance impedance. This node is active only when NS is at

logic high. This node may be terminated when not used (i.e., NS at logic low).

21

N2 Network Balance Node 2 (Output). See N1 for description.

22

Z900 Line Impedance 900Ω Node. Connects to Z1 for a line impedance of 900Ω. This node

should be left open circuit when not used.

23

Z1 Line Impedance Node 1 (Input). 0.1 times the times the impedance between pins Z1 and

Z2 is the device’s line impedance. This node must always be connected.

24

Z2 Line Impedance Node 2 (Output). 0.1 times the times the impedance between pins Z1

and Z2 is the device’s line impedance. This node should be left open circuit when not used.

25

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

26

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

27

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

28

GTX1 Transmit Gain Node 1. Connects to a resistor to AGND for transmit gain adjustment.

29

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

30

GRX1 Receive Gain Node 1. Connects to a resistor to AGND for receive gain adjustment.

31

IC Internal Connection. This pin is internally connected and must be left open.

32

Z600 Line Impedance 600Ω Node (Output). Connects to Z1 for a line impedance of 600Ω. This

pin should be left open circuit when not used.

33

NS Network Balance Setting (Input. The logic level at NS selects the network balance

impedance. A logic 0 enables an internal balance equivalent to the input impedance (Zin).

While a logic 1 enables an external balance 0.1 times the impedance between pins N1 and

AGND balanced to 0.1 times the impedance between pins N1 and N2. The impedance

between N1 and N2 must be equivalent to 10 times the input impedance (Zin).

34

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

ground (AGND) potential.

35

RL Ring Loop Detect (Output). In the on-hook state, a logic low output indicates that reverse

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

current is present. Reverse loop refers to the Tip lead negative with respect to the Ring

lead.

36

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

and Ring leads. Note that this output toggles at the ringing cadence and not at the ringing

frequency.

2-237

Share Link: