–Data Block Count, 8 bits •Sequence number of 1st Data Block in the packet •Same meaning as in 61883 over 1394 June 24, 2007 IEEE P1722 AVBTP Working Group Contribution 13 Encapsulation Assumptions •Approved by Consensus: –CIP header 2nd quadlet indicator, 2 bits •Fixed at 10 binary –Stream Format, 6 bits •Same values as currently defined for 61883 –Format Dependent Field (FDF), 8 bits if SPH=0, 24 Bartky Networks www.bartky.net –Format Dependent Field (FDF), 8 bits if SPH=0, 24 bits if SPH=1 •Same values as currently defined for 61883 –SYT field (1394 cycle time based presentation time for SPH field equals 0) •Mandatory for use by AVBTP end stations •Same as 1394/61883 June 24, 2007 IEEE P1722 AVBTP Working Group Contribution 14 Encapsulation Assumptions •Approved by Consensus: –CIP header 2nd quadlet • Channel ID (0-63) – 0-30 & 32-63: originating channel ID from 1394 network. – 31: originating source is on AVB network (native AVB) • Source ID (0-63) – 0-62 originating Source ID from IEEE 1394 network Bartky Networks www.bartky.net – 0-62 originating Source ID from IEEE 1394 network – 63 originating source is on AVB network • Reserved (2 bits) – Same as 1394/61883 » Set to 0 on transmit » Ignore on receive. • “sy”field (4 bits) (currently used by 1394 for Digital rights management). – Same as 1394/61883 June 24, 2007 IEEE P1722 AVBTP Working Group Contribution 15 Encapsulation Assumptions •Proposals: –For all class 5 traffic, limit maximum transmission unit size in order to limit total transmission time on and 802.3 100 megabit (including preamble and inter-frame gap to 75% of 125µs) Bartky Networks www.bartky.net –For all 61883 type traffic, limit maximum data payload to 256 quadlets (1024 bytes) •>> Editor’s note: Needs work.