This working group will consider revisions to the DS1 and DS3 MIBs (currently published as Proposed Standards in RFC-1232 and RFC-1233) in preparation for their consideration as Draft Standards. Consistent with the IETF standards process, the working group is chartered to consider only those changes to the DS1 and DS3 MIBs that are based on implementation experience or on the need to align with relevant ANSI T1M1 standards. In this context, the working group will thoroughly document the implementation or alignment rationale for each considered change. All changes made by the working group will be consistent with the existing SNMP framework and standards --- in particular, those provisions of RFC-1155 regarding addition and deprecation of objects in standard SNMP MIBs. This working group will be a short-lived activity, involving a single meeting, and will conclude its business no later than June 1992.