1964_IMPORT_AND_EXPORT_(STRATEGIC_COMMODITIES)_REGULATIONS — Page 64

G 64

CAP. 60]

Import and Export (Strategic Commodities) Regulations

[1988 Ed.

[Subsidiary]

2. Digital transmission techniques include, inter/alia, pulse code modulation

(PCM).

(c) Data communication equipment employing digital transmission with digital input and output, including telegraphic and data transmission, having any of the following characteristics:

(1) Designed for operation at a "data signalling rate" in bits per second, excluding

servicing and administrative channels, numerically exceeding either:

(i) When using FDM voice channel

(a) 9 600; or

(b) 320 per cent of the channel (or sub-channel) “bandwidth” in hertz; or (ii) When using baseband: 19 290;

(2) Employing an automatic error detection and correction system having both of

the following characteristics:

(i) Retransmission is not required for correction; and

(ii) A "data signalling rate? exceeding 300 bits per second;

(3) Statistical multiplexers designed for operation at a "data signalling rate" in bits per second, excluding/servicing and administrative channels, numerically exceeding either:

(i) 4 800, or

(ii) 160 per cent of the channel (or sub-channel) "bandwith" in hertz;

Notes:

1.

2.

This sub-item is not intended to cover frequency division multiplexers used to subdivide a voice channel or data channels not exceeding the limits of (1) above.

For statistical multiplexers which satisfy the definitions of either "data (message) switching" or "stored-programme controlled circuit switching", as well as for the definitions of these terms, see Item IL 1567. (d) Components and accessories specially designed for the above equipment, and test equipment specially designed for the equipment covered by (b) above. (See Item IL 1526 for connectors including wave-length multiplexers.) Technical Notes:

1.

2.

Notes:

1.

2.

"Data signalling rate" is as defined in ITU Recommendation 53-36, taking into account that for non-binary modulation, "bauds" and "bits per second" are not equal/ Bits for coding, checking and synchronization functions are to be included.

In the case of data communication equipment designed to operate in one voice channel, "bandwidth" will normally be as defined in CCITT Recommendation G. 151, namely, 3 100 Hz. In the case of CCITT or CCIR voice frequency telegraph systems, "bandwidth" may be considered as the number of channels times the channel spacing.

Not used.

This item is not intended to cover:

(a) Telemetering, telecommand and telesignalling equipment designed for industrial purposes, together with data transmission equipment not intended for the trans- mission of written or printed text and specially designed components, accessories and test equipment therefor. By telemetering, telecommand and telesignalling equipment is meant sensing heads for the conversion of information into electrical information, the systems used for its long-distance transmission, the processes used to translate electrical information into coded data (telemetering), into control signals (telecommand), and into display signals (telesignalling);

(b) Facsimile equipment other than that embargoed under Item IL 1527; (c) Equipment employing exclusively the direct current transmission technique; (d) Electronic measuring equipment suitable for use with PCM transmission equipment defined in CCITT Recommendation series G. 700 to 746 (ITU Geneva) for PCM up to 8.5 Megabits per second.