MX860D6 Просмотр технического описания (PDF) - MX-COM Inc

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MX860D6

Telephone Signaling Transceiver

MX-COM Inc  

Telephone Signaling Transceiver

28

CMX860 Advance Information

Programming is done by writing a sequence of twenty-seven 16-bit words to the Programming Register.

The first word should be 32769 (8001 hex), the following twenty-six 16-bit words set the frequencies and

levels and are in the range 0 to 32767 (0000-7FFF hex).

Word

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Value written

32769

Filter #1 coefficient b21

Filter #1 coefficient b11

Filter #1 coefficient b01

Filter #1 coefficient a21

Filter #1 coefficient a11

Filter #1 coefficient b22

Filter #1 coefficient b12

Filter #1 coefficient b02

Filter #1 coefficient a22

Filter #1 coefficient a12

Freq measurement #1 ncycles

Freq measurement #1 mintime

Freq measurement #1 maxtime

Word

Value written

15

Filter #2 coefficient b21

16

Filter #2 coefficient b11

17

Filter #2 coefficient b01

18

Filter #2 coefficient a21

19

Filter #2 coefficient a11

20

Filter #2 coefficient b22

21

Filter #2 coefficient b12

22

Filter #2 coefficient b02

23

Filter #2 coefficient a2

2

24

Filter #2 coefficient a12

25 Freq measurement #2 ncycles

26 Freq measurement #2 mintime

27 Freq measurement #2 maxtime

The coefficients are entered as 15-bit signed (two’s complement) integer values (the most significant bit of the

16-bit word entered should be zero) calculated as 8192 * coefficient value from the user’s filter design

program (i.e. this allows for filter design values of -1.9999 to +1.9999).

The design of the IIR filters should make allowance for the fixed receive signal filtering in the CMX860 which

has a low pass characteristic above 1.5kHz of 0.4dB at 2kHz, 1.2dB at 2.5kHz, 2.6dB at 3kHz and 4.1dB at

3.4kHz.

‘ncycles’ is the number of signal cycles for the frequency measurement.

‘mintime’ is the smallest acceptable time for ncycles of the input signal expressed as the number of 9.6kHz

timer clocks. i.e. ‘mintime’ = 9600 * ncycles / high frequency limit

‘maxtime’ is the highest acceptable time for ncycles of the input signal expressed as the number of 9.6kHz

timer clocks. i.e. ‘maxtime’ = 9600 * ncycles / low frequency limit

The level detectors include hysteresis. The threshold levels - measured at a 2-wire line interface with unity

gain filters, using the typical line interface circuits described in Sections 3.3 and 3.4, 1.0 dB line coupling

transformer loss and with the Rx Gain Control block set to 0dB - are nominally:

‘Off’ to ‘On’ -44.5dBm

‘On’ to ‘Off’ -47.0dBm

Note that if any changes are made to the programmed values while the CMX860 is running in Programmed

Tone Detect mode they will not take effect until the CMX860 is next switched into Programmed Tone Detect

mode.

4.12.10 Other Registers

C-BUS addresses $E4, $E9, $EA and $EB are reserved and should not be accessed.

¤2000 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480222.001

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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