Definitions of Managed Objects for the DS1, J1, E1, DS2, and E2 Interface Types

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RFC 4805                  DS1/J1/E1/DS2/E2 MIB                March 2007


3.2.5.  Usage of Loopbacks

   This section discusses the behavior of objects related to loopbacks.

   The object dsx1LoopbackConfig represents the desired state of
   loopbacks on this interface.  Using this object, a manager can
   request

       LineLoopback
       PayloadLoopback (if ESF framing)
       InwardLoopback
       DualLoopback (Line + Inward)
       NoLoopback

   The remote end can also request loopbacks either through the Facility
   Data Link (FDL) channel if ESF or inband if D4.  The loopbacks that
   can be requested this way are

       LineLoopback
       PayloadLoopback (if ESF framing)
       NoLoopback

   To model the current state of loopbacks on a DS1 interface, the
   object dsx1LoopbackStatus defines which loopback is currently applied
   to an interface.  This object, which is a bitmap, will have bits
   turned on that reflect the currently active loopbacks on the
   interface as well as the source of those loopbacks.

   The following restrictions/rules apply to loopbacks:

   The far end cannot undo loopbacks set by a manager.

   A manager can undo loopbacks set by the far end.

   Both a line loopback and an inward loopback can be set at the same
   time.  Only these two loopbacks can co-exist and either one may be
   set by the manager or the far end.  A LineLoopback request from the
   far end is incremental to an existing Inward loopback established by
   a manager.  When a NoLoopback is received from the far end in this
   case, the InwardLoopback remains in place.

3.3.  Objectives of This MIB Module

   There are numerous things that could be included in a MIB for DS1
   signals:  the management of multiplexers, CSUs, Data Service Units
   (DSUs), and the like.  The intent of this document is to facilitate
   the common management of all devices with DS1, J1, E1, DS2, or E2
   interfaces.  As such, a design decision was made up front to very



Nicklass, Ed.               Standards Track                    [Page 10]