HMS common inside plant management information base (MIB) : SCTE-HMS-HE-OPTICAL-SWITCH-MIB / Engineering Committee, Hybrid Management Sub-layer Subcommittee, Society of Cable Telecommunication Engineers. (OCLC #956318367)
This piece has no publication date. There is a copyright statement on page 2 of the cover (the back of the front cover), but it only lists the publisher. The standard number does not include a date, and it is simply marked as “CURRENT”.
I read a bit into the code (like this one, the bulk of the content is code) and found this:
heOpticalSwitchMIB MODULE-IDENTITY LAST-UPDATED "200310090000Z" -- Oct 9, 2003 ORGANIZATION "SCTE HMS Working Group" CONTACT-INFO "SCTE HMS Subcommittee, Chairman mailto: standards@SCTE.org"
This seemed sufficient evidence to assign a probable publication date:
264 _1 ǂa Exton, PA : ǂb Society of Cable Telecommunications Engineers, ǂc 
I included a note indicating the source, so other catalogers can confirm they have the same copy in hand:
500 __ ǂa "LAST-UPDATED "200310090000Z" -- October 9, 2003"--Page 2.