ISDN TA POTS Interface

CMX625

 2001 Consumer Microcircuits Limited

22

D/625/2

Example 2: Read the CMX625 DTMF RX DATA register, D3-D0=$A. Set IOM-2 address to SA2-SA0

=100 and device select, DS=0.

MX

(DD)

MR

(DU)

DD

(hex)

MX

(DU)

MR

(DD)

DU

(hex)

Comment

1

1

FF

1

1

FF

Monitor Channel Idle State

0

1

C0

1

1

FF

Transmit IOM-2 Address

0

0

C0

1

1

FF

Acknowledge Address

1

0

0B

1

1

FF

Transmit Command (Write IOM-2 Control, $B)

0

1

0B

1

1

FF

1

0

FF

0

1

CB

Acknowledge Command/ Send Address

1

1

FF

0

0

CB

Address Acknowledged

1

1

FF

1

0

0A

Send DTMF Read Data

1

1

FF

0

1

0A

1

1

FF

1

0

FF

Data Acknowledged

1

1

FF

1

1

FF

End of Transmission

1

1

FF

1

1

FF

Idle

1.5.16 Glossary

ADC

Analogue to Digital Converter

CIDCW

Caller Identification During Call Waiting

CODEC

Coder/Decoder

DAC

Digital to Analogue Converter

DTMF

Dual Tone Multiple Frequency

FSK

Frequency Shift Keying

GCI

General Circuit Interface

IOM-2

ISDN Oriented Modular revision 2

ISDN

Integrated Services Digital Network

ITU

International Telecommunication Union

NTU

Network Termination Unit

PC

Personal Computer

PCM

Pulse Code Modulation

POTS

Plain Old (Analogue) Telephone Service

SPM

Subscriber Pulse Metering

TA

Terminal Adaptor