ETSI - ETS 300 143
Integrated Services Digital Network (ISDN); Audiovisual Services Inband Signalling Procedures for Audiovisual Terminals Using Digital Channels up to 2 048 kbit/s
| Organization: | ETSI |
| Publication Date: | 1 January 1994 |
| Status: | inactive |
| Page Count: | 27 |
scope:
This ETS specifies inband signalling procedures for establishing communication between audiovisual terminals using digital channels of up to 2 048 kbit/s. The system is based on the frame structure and associated syntax as specified in ETS 300 144 [1]. The procedures are required to establish a compatible mode upon call set-up, to switch between modes during a call and to allow for use of supplementary services as described in ETS 300 145 [2].
A separate ETS (DE/TE-04120) is under preparation which specifies the method of testing required to identify conformance to this ETS.
This ETS is applicable to terminals supporting the telephony 7 kHz or videotelephony teleservice and to other terminals designed for audiovisual communication.
NOTE: It is assumed within this ETS that, due to frame synchronisation and signalling overheads, the bit rate which can be used for user data in 2 048 kbit/s transmission systems is limited to 1 920 kbit/s.
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