Supplemental Performance Report Message
In telecommunications, a Supplemental Performance Report Message (abbreviated SPRM) is used in DS1 transmissions to indicate various conditions. It is a type of Performance Report Message (PRM).
The unused U1, U2, and R bits of a PRM are used in SPRMs primarily to sectionalize circuit failures.
| Bit | Description |
|---|---|
| U1 | This bit is used to indicate one or more CRC-6 errors or framing errors were detected since the last SPRM message was sent (by remote unit) |
| U2 | This bit is used to indicate that one or more CRC-6 errors, framing errors, BPVs or EXZs were detected since the last SPRM message was sent (by remote unit). |
|
R |
Unknown |
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