This preview shows page 1. Sign up to view the full content.
Unformatted text preview: 2–14 of the Transfer Frame Primary Header shall contain the Virtual Channel Identifier
1 The Virtual Channel Identifier provides the identification of the Virtual Channel. 2 There are no restrictions on the selection of Virtual Channel Identifiers. In particular,
Virtual Channels are not required to be numbered consecutively. 188.8.131.52 Operational Control Field Flag 184.108.40.206.1 Bit 15 of the Transfer Frame Primary Header shall contain the Operational
Control Field Flag.
220.127.116.11.2 The Operational Control Field Flag shall indicate the presence or absence of the
Operational Control Field. It shall be ‘1’ if the Operational Control Field is present; it shall
be ‘0’ if the Operational Control Field is not present.
18.104.22.168.3 The Operational Control Field Flag shall be static within the associated Master or
Virtual Channel throughout a Mission Phase.
NOTE – For the significance of the above-mentioned association, see 4.1.5.
22.214.171.124 Master Channel Frame Count 126.96.36.199.1 Bits 16–23 of the Transfer Frame Primary Header shall contain the Master
Channel Frame Count.
188.8.131.52.2 This 8-bit field shall contain a sequential binary count (modulo-256) of each
Transfer Frame transmitted within a specific Master Channel.
184.108.40.206.3 A re-setting of the Master Channel Frame Count before reaching 255 shall not
take place unless it is unavoidable.
NOTE – The purpose of this field is to provide a running count of the Transfer Frames
which have been transmitted through the same Master Channel. If the Master
Channel Frame Count is re-set because of an unavoidable re-initialization, then
the completeness of a sequence of Transfer Frames in the related Master Channel
cannot be determined. CCSDS 132.0-B-1 Page 4-4 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 220.127.116.11 Virtual Channel Frame Count 18.104.22.168.1 Bits 24–31 of the Transfer Frame Primary Header shall contain the Virtual
Channel Frame Count.
22.214.171.124.2 This 8-bit field shall contain a sequential binary count (modulo-256) of each...
View Full Document
This document was uploaded on 03/06/2014.
- Spring '14