CMX602A データシートの表示（PDF） - MX-COM Inc

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CMX602A

Calling Line Identifier/Calling Line Identifier on Call Waiting

MX-COM Inc  

Calling Line Identifier/Calling Line Identifier on Call Waiting 13

CMX602A PRELIMINARY INFORMATION

5.1.2 British Telecom System

Figure 12 illustrates the line signaling and CMX602A input and output signals for the British Telecom 'On-

Hook' Caller ID system as defined in the British Telecom specifications SIN227 and SIN242 part 1. A similar

system is described in ETSI 300 659-1 Section 6.1.2c.

The Tone Alert signal consists of simultaneous 2130Hz and 2750Hz tones. The 'Chan Seize' signal consists

of a '1010..' FSK bit sequence. Not shown are the requirements for AC and DC loads, including a short initial

Current Wetting Pulse, to be applied to the line 20ms after the end of the Tone Alert signal and to be

maintained during reception of the FSK signal.

Note: For simplicity of presentation, the Data Retiming function is not used in Figure 12 (RXCLK is kept high).

SIGNALING

Line

reversal

IDLE 1

³ 100mS

< 4.8Sec

88-110mS

TONE

ALERT

IDLE 2

³ 45mS

< 4.8Sec

80-262mS 45-75mS

CHAN

SEIZE

MARK

£ 2.5Sec

>200mS

MESSAGE

RINGING

RD

RT

IRQ

ZP

MODE

DET

RXD

Note 2

Notes:

1. IDLE 1 + IDLE 2 £ 5 sec

2. IRQ may go low at end of DET high period but this is not guaranteed.

Figure 12: British Telecom System Signals

5.1.3 Other 'On-Hook' Systems

ETS 300 659-1 also allows for systems where the FSK transmission is preceded by a Dual Tone Alert signal

similar to that used by British Telecom but without line reversal (ETS 300 659-1 Section 6.1.2a) or by a

Ringing Pulse alerting Signal (ETS 300 659-1 Section 6.1.2b).

The U.K. CCA (Cable Communications Association) specification TW/P&E/312 precedes the FSK signals by

a 200 to 450ms ring burst. AC and DC line terminations during FSK reception are optional.

Mercury Communications Ltd. Specification MNR 19 allows for either the British Telecom system or that

specified by CCA.

As these are all slight variants on the Bellcore and British Telecom systems, they can also be supported by

the CMX602A.

¤1999 MX-COM, Inc

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480169.004

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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