Telephone JJY Transmission Parameter for Communication

Time Dissemination by Telephone(TEL-JJY)

Transmission Parameter for Communication

2.1 Parameters

Communication form	Duplex Synchronous Random Start-stop
Baud rate	300 bps(Duplex CCITT V.21 BELL 103 type) 1200 bps(Duplex CCITT V.22 BELL 212A type) 2400 bps(Duplex CCITT V.22bis type)
Connect mode	Non MNP
Data (characters) size	8bit
Start bit	1bit
Stop bit	1bit
Parity	None
Flaw control	Xon/Xoff
Local echo back	Nothing
Chinese character code	Shift JIS or JIS
Return key transmitting time	CR code only (without LF code)
Receiving time of CR	CR code only (without LF code)

* Attentions:
The baud rates 300, 1200, or 2400 bps are all acceptable.

You are recommended not to use the error correction protocol for keeping the time precision. But if the line quality is poor, we recommend you to use the next error calibration protocols. In this case, the following additive delay should be considered.
MNP4 : about 10 ms
V.42 : about 12 ms
MNP5 : about 52 ms
V.42bis : about 6 - 50 ms (varying as the conditions)
Please note the recent modems have large fluctuation in time delay during the one access time, even though the error calibration protocol is not used. To our knowledge, the stable modem is below.
MD24FB10V
Omron Co., Ltd. (Phone: +81 45 411 7223)

2.2 Transmission control code

CR	Carriage Return (ODH)
LF	Line Feed (OAH)
Xon	Transmitting restart(11H)
Xoff	Transmitting stop (13H)