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本文(ITU-R BT 806-1992 Common Channel Raster for the Distribution of D-MAC D2-MAC and HD-MAC Signals in Collective Antenna and Cable Distribution Systems《收集天线和有线分配系统中D-MAC、D2-MAC 和 HD-M.pdf)为本站会员(孙刚)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ITU-R BT 806-1992 Common Channel Raster for the Distribution of D-MAC D2-MAC and HD-MAC Signals in Collective Antenna and Cable Distribution Systems《收集天线和有线分配系统中D-MAC、D2-MAC 和 HD-M.pdf

1、CCIR RECMN*80b 92 4855232 0520LL8 Ob5 Rec. 806 139 RECOMMENDATION 806* COMMON CHANNEL RASTER FOR THE DISTRIBUTION OF D-MAC, D2-MAC AND HD-MAC SIGNALS IN COLLECTIVE ANTENNA AND CABLE DISTRIBUTION SYSTEMS (Question 68/1 i) ( 1992) The CCIR, considering a) that Recommendation 650 in Annex 1 recommends

2、the use of multiplex analogue components systems D-MAC/packet and DZMAC/packet systems for satellite emission of TV, and gives the corresponding specifications; b) that Recommendation 787 recommends the HD-MAC/packet system for satellite emission of MACpacket- based compatible HDTV, and gives the co

3、rresponding specifications; c) that there is an urgent need to provide means of distributing the TV signals received from these emissions in cable and community antenna systems; d hat VSBIAM versions of the D-, D2- and HD-MAC systems intended for such distribution are specified internationally by, f

4、or example, the EBU in Tech. hblication 3258; e) that the RF characteristics of MAC AM-VSB cable receivers have been specified internationally in, for example, the European standard EN 50080; 0 that VSB/AM D- and HD-MAC are optimized for distribution in 12 MHz channels; g) that VSB/AM D2-MAC is adap

5、ted for distribution in channels with a bandwidth of 8 MHz; h) that VSB/AM D2-MAC signais can also be conveyed with full quality in a 12 MHz channel; ,., j) that a common channel raster would be of great advantage to facilitate the transition from MAC/packets to HD-M AC/packets; k) that so far few a

6、dministrations have implemented the use of the band 300-470 MHz (also known as hyperband) for cable systems, noting that DZMAC terrestrial narrow-band emission is under study, recommends that, to the extent practicable, administrations or organizations wishing to have a common channel raster in their collective antenna and cable distribution systems for HD-MAC, D-MAC or full-quality D2-MAC VSB/AM signals in the band from 300-470 MHz should use a 12 MHz channel raster. * This Recommendation should be brought to the attention of the EC aod the CMT.

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