IØ - Standardization Rob Beverly MIT CSAIL January 16, 2007.

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Presentation transcript:

IØ - Standardization Rob Beverly MIT CSAIL January 16, 2007

Beverly/I0/ Changing Face of the Internet Network participants no longer just servers and humans in front of a PC Small, simple, inexpensive, low- bandwidth on-net devices InternetØ design goals: –Primary emphasis on simplicity and cost (both production and installation) –Not speed! Light switch does not need high bandwidth to send “on” instruction

Beverly/I0/ An Embedded World Can we apply the architectural principles embodied in the Internet (End-to-End [Saltzer, Reed, Clark], Fate-Sharing [Carpenter], etc) to this new embedded device world? Are there new architectural principals in this an embedded world to guide future Internet connectivity/design?

Beverly/I0/ Competing Standards Other projects have had similar design goals Standards proliferation (whew!) –X10, HomePlug, LonWorks, BACnet. CEBus, Fieldbus, ModBus, CAN, Lin, I2C, SPI, SSI, ASI, USB, EPC, IrDA, Bluetooth, , ZigBee Each optimized for a particular domain Use architectural lessons of the Internet? Internet Ø : not optimized for any single medium or application, but suitable for any

Beverly/I0/ IETF Requests for Comments (RFCs) Internet Engineering Task Force (IETF) An important component of Internet’s success (past/present/future)! Differs from formal standardization bodies (ANSI, ISO, etc) Open submission, no support from external institutions required Rounds of open peer review by Internet community Multiple interoperating implementations

Beverly/I0/ InternetØ Drafts Two Internet Drafts submitted to IETF draft-gershenfeld-thtp-00 : –Trivial Hypertext Transfer Protocol draft-gershenfeld-i0-00 : –An end-to-end modulation scheme

Beverly/I0/ THTP HTTP: –powerful URI naming construct –standards based i0 devices cannot tolerate overhead of tight HTTP/TCP coupling Enter THTP: scaled down adaptation of HTTP for UDP transport

Beverly/I0/ i0 End-to-End Modulation Simple: –Encode packets via pulse-position “click” impulses Medium Independent: –Same encoding scheme irrespective of underlying medium –Clicks as electrical, optical, radio or acoustic impulses Inexpensive: –Minimize both production, installation and debugging costs End-to-End: –Allow the same encoding scheme across interconnections between media

Beverly/I0/ i0 Clicks Click byte transmission: Logical and physical representation the same: | ||| | |||| ||||| |||| | | || |||||||||| |||| ||||| ||||| |||||| ||||| | | ||||| |||| ||||| | ||| ||||| |||||| ||| | ||| ||||||| || ||||| |||| ||||| | ||| |||| ||||| ||| | ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ | | | | | | | | | | | | |--:--|--:--|--:--|--:--|--:--|--:--|--:--|--:--|----> start stop

Beverly/I0/ InternetØ Drafts Informational RFCs drive “standardization” via community backing Quality of draft = ability to implement a working system based on that draft Backing from Sun, Cisco, Schneider! Today’s demos are working implementations of the drafts!