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Vexen Crabtree 2015


Vexen Crabtree's Live Journal

Sociology, Theology, Anti-Religion and Exploration: Forcing Humanity Forwards

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Vexen Crabtree 2015

Stuff I'm learning

This stuff is utterly beyond all levels of boring I've previously encountered.

ISDN utilizes a suite of ITU-T standards spanning the physical, data link, and network layers of the OSI reference model:
  • The physical layer - The ISDN Basic Rate Interface (BRI) physical layer specification is defined in ITU-T I.430. The ISDN Primary Rate Interface (PRI) physical layer specification is defined in ITU-T I.431.
  • The data link layer - The ISDN data link layer specification is based on LAPD and is formally specified in ITU-T Q.920, ITU-T Q.921, ITU-T Q.922 and ITU-T Q.923.
  • The ISDN network layer - The ISDN network layer is defined in ITU-T Q.930 (also known as I.450) and ITU-T Q.931 (also known as I.451). Together these two standards specify user-to-user, circuit-switched, and packet-switched connections

I don't know how to remember stuff that is sooooo anally uninteresting (AU)! I've done well so far, but ISDN seem to be a study of Terminology Without Reason (TRW), according to Vexen standard 2002 (Circa 2004, beta release known as 2003ra). TRWb (Also known as TRW-AU1) was adopted by LJ on 2002 Oct 29 RFC, however Cisco delayed release until 2005 due to a lack of TLAs, which led to the widespread adoption of No-one's TRWB-232 standard, except in Southern UK where it is known as ISTR-Nothing v29.

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*rofls* Funny wiggy :D

*tugs you to come play with her tarot cards instead* They've all got pretty pictures on, and you can make stories with them! Oh, and my Halloween tarot deck has a cute black cub in every single card :D *pets you and the cub*

But protocol stacks are so much fun!

If you really want mindfuck-material, you should look at some of the actual protocol-definition documents - especially any one which is written in a formal syntax called ASN.1 which was largely developed by my one-time co-conspirator John Larmouth.

As I have been known to comment in the Scary Devil Monastery, I offer you a new vision of Hell: Watching an entire ISO committee trying to agree on what wine to have with their meal.

oh god, ASN.1.

I used to work for a Telco, making low-level gear.

Like, I could write ISDN streams at a byte-level off the top of my head.

If you think ISDN specs are bad, have you seen the SS7/IN7 stuff? It only gets worse from here on in :)

anally uninteresting (AU)

And of course, Au is the chemical symbol for gold. Being expert in a variety of AU standards can bag you a lot of money :)

I read it as 'Astronomical Unit', the average distance of the Earth from the Sun... signs of a mis-spent youth, perhaps!

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