[CESG] new SCID rules

[Clemens Heese]

Dear Jim,


CCSDS 320.0-M-7 §3.4.3 says only each QSCID must be unique. SCIDs can already be duplicate now IMHO.

[Image.png]


 maintains independent sets of assignments for each combination of Frequency Band (FB) and Transfer Frame Version Number (TFVN).

So, for example, these can coexist:

  *   SCID 100, TFVN 1, X-NE
  *   SCID 100, TFVN 1, Ka-NE
  *   SCID 100, TFVN 2, X-NE

They are different Q-SCIDs, despite having the same numerical SCID. The standard explicitly says each Q-SCID must be globally unique within its assigned TFVN and frequency band during its assignment period 😉.

Regards,

Clemens

________________________________
From: CESG <cesg-bounces at mailman.ccsds.org> on behalf of Lux, Jim (US 430E) via CESG <cesg at mailman.ccsds.org>
Sent: Friday, 23 October 2026 14:26:20
To: CESG Mailing List <cesg at mailman.ccsds.org>
Cc: mbernier at cofomo.com <mbernier at cofomo.com>; Paul Thompson <paul at redspace.ltd>
Subject: [CESG] new SCID rules

Clemens and I were discussing the "mechanics" of instituting a policy where two spacecraft could use the same scid (with recognition that risk is accepted by both). What we didn't know is how we'd promulgate this.
As it happens 320.0-M-7 defines the SCID assignment process.  There's a couple paragraphs that would need to be updated (3.4.3, for instance, says no duplicates)




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James Lux
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4200 Telecom Programs and Oversight

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