CMX867A 查看數據表（PDF） - CML Microsystems Plc

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CMX867A

V.22 Full Duplex Call Set-Up on the CMX867

CML Microsystems Plc 

period after dialling and before Answer tone recognition. The cadence is 0.6s

ON, 1.75s OFF (typ.).

For V.22 this tone is NOT permitted, but the following details are included for

other applications:

TX Mode ($E1)

b15..b12 = 0001 (select DTMF / Tones)

b3..b0 = 1001 (1300Hz Calling tone)

2.2. The V.25 automatic answering sequence shall be transmitted from the answer

mode modem on international GSTN connections. The transmission of the

V.25 sequence may be omitted on point-to-point leased circuits, or on

national connections on the GSTN where permitted by the Administration.

2.3. V.14 specifies stop bit omission / recovery where DTE data speed is different

from modem speed and specifies two difference ranges, +1% to –2.5% (basic)

and +2.3% to –2.5% (extended). The CMX867 enables stop bit deletion by

providing two Tx Data registers, $E3 for normal transmission and $E4 for

transmission with one stop bit removed from the current format. Hence the

host can adjust the removal of stop bits according to V.14 by directing bytes

to the appropriate Tx Data register.

At the receiving end the CMX867 can tolerate missing stop bits if set to basic

or extended over-speed mode.

Rx Mode ($E2)

b5…b3 = 101 (for basic range)

or b5…b3 = 100 (for extended range)

or b5…b3 = 110 (for over-speed function disabled)

2.4. The CMX867 passes only 8 bit data over the C-Bus to the remote host

controller. The host controller must read the Status register ($E6) and check

for parity, framing, and overflow errors before reconstituting the character in

its original format for onward transmission to the remote DTE.

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