FSK standards for use in Caller ID and remote metering

Frequency-shift keying is used over telephone lines for Caller ID and remote metering applications. There are several variations on this technology.

ETSI FSK

The European Telecommunications -1 and -2, and ES 200 778-1 and -2, the latter replacing ETS 300 778-1 & -2) allows 3 physical transport layers (Telcordia Technologies (formerly Bellcore), BT and CCA) combined with 2 data formats (MDMF & SDMF), plus the DTMF system and a no-ring mode for meter-reading and the like. It's more of a recognition that the different types exist than an attempt to define a single "standard".

Telcordia Technologies (formerly Bellcore) FSK

The Telcordia Technologies (formerly Bellcore)standard is used in the USA, Canada (but see below), Australia, China, Hong Kong and Singapore (who have their own standard?)huh It sends the data after the first ring tone and uses the 1200 baud Bell 202 tone modulation. The data may be sent in Single Data Message Format (SDMF) which includes the date, time and number or in Multiple Data Message Format (MDMF) which adds a NAME field.

BT (British Telecom) FSK

British Telecom developed their own standard, which wakes up the display with a line reversal, then sends the data as CCITT V23 modem tones in a format similar to MDMF. It is used by BT, wireless networks like the late Ionica, and some cable companies (Nynex?). Details are to be found in BT Supplier Information Notes (SINs) [http://www.sinet.bt.com/227v3p4.pdf 227] and [http://www.sinet.bt.com/242v2p3.pdf 242] ; another useful document is [http://www.exar.com/product.php?ProdNumber=XR2211 Designing Caller Identification Delivery Using XR-2211 for BT] from the EXAR website.

CCA (Cable Communications Association) FSK

The Cable Communications Association in the UK developed their own standard which sends the data after a short first ring, as either Bell 202 or V23 tones. They developed a new standard rather than change some street 'boxes' (multiplexors) which couldn't cope with the BT standard. The UK cable industry use a variety of switches - most are Nortel DMS-100's, some are System X, System Y and Nokia DX220's, and some of these use the BT standard instead of the CCA one! The data format is similar to BT's, but the transport layer is more like Telcordia Technologies (formerly Bellcore), so North American or European kit is more likely to detect it.