CMX602B 查看數據表（PDF） - MX-COM Inc
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CMX602B Datasheet PDF : 22 Pages
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Calling Line Identifier plus Call Waiting (Type II)
13
CMX602B PRELIMINARY INFORMATION
5.1.2 British Telecom System
Figure 12 illustrates the line signaling and CMX602B 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).
LINE
SIGNALING Line
reversal
IDLE 1
³ 100ms
< 4.8 sec [1]
88-110ms
IDLE 2
³ 45ms
< 4.8 sec [1]
80-262ms
TONE
ALERT
CHAN
SEIZE
45-75ms
MARK
£ 2.5 sec
> 200ms
MESSAGE
RINGING
RD
RT
[2]
IRQ
ZP
MODE
DET
RXD
FSK IDLE
[1] IDLE 1 + IDLE 2 £ 5 sec.
[2] IRQ may go low at end of DET high period, but this is not guaranteed.
FSK DATA
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 CMX602B.
2000 MX-COM, Inc
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480204.002
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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