PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
Figure 28 shows the timing of the receive alarm port associated with the STM-1
(STS-3) tributary processor (STP) #1. Timing is provided by the POHCK output
which is a continuous 9.72 MHz clock. The BIP-2, RDI, auxiliary RDI, PDI and
LOM indications of all the tributaries in the incoming stream are combined and
reported on the RAD[1] output. The bits labeled B1 and B2 reports the number of
BIP-2 errors. If the number of BIP-2 errors is one, only one of B1 is set high. Both
B1 and B2 are set high when two BIP-2 errors are detected. The bit labeled R
and AR reports the remote defect indication (RDI) and auxiliary remote defect
indication (ARDI) status of the associated tributary. They are set high due to
incoming AIS, LOP, PSLM, PSLU, TIM, TIU and LOM. The bit labeled P report
the path defect indication (PDI-P) due to tributary path defect indication PDI-V,
AIS, LOP and UNEQ states. The PDI-P indications allow a downstream device
where the tributaries are aggregated into an SPE to form a C2 byte containing
the count of tributaries in alarm state. The bit labeled L reports the loss of
multiframe state. Tributaries timeslots on RAD[1] are arranged in the order of
transmission as in the incoming data stream ID[7:0]. I.e., TU #1 of TUG2 #1
TUG3 #1, TU #1 of TUG2 #1 TUG3 #2, TU #1 of TUG2 #1 TUG3 #3, TU#1 of
TUG2 #2 TUG3 #2, ... TU #1 of TUG2 #7 TUG3 #3, TU #2 of TUG2 #1 TUG3 #1,
..., TU #2 of TUG2 #7 TUG3 #3, ..., TU #4 of TUG2 #7 TUG3 #3. Timeslot
assignment on RAD[1] is unrelated to the configuration of the tributary group.
Timeslots for four tributaries are always reserved for any tributary group even if it
is configured for TU12, VT3 or TU2. At timeslots devoted to non-existent
tributaries, for example, tributary 2, 3 and 4 of a TUG2 configured for TU2,
RAD[1] will be set low. The path overhead frame pulse, POHFP[1], identifies the
BIP-2 error indication for the odd-numbered bits of the first tributary (TU #1 of
TUG2 #1 STS-1 #1) on RAD[1].
When a TUG3 stream is configured in TU3 mode, the segregation of RAD[1], for
that TUG3, into tributary timeslots are dissolved. Any bit normally carrying
tributary BIP-2 indications may carry a TU3 BIP-8 error indication. All remaining
bits will report the associated state of the TU3 stream simultaneously.
This functional timing also applies to receive alarm ports, RAD[2], RAD[3] and
RAD[4] associated with the STM-1 (STS-3) tributary processor (STP) #2, #3 and
#4, respectively. The path overhead frame pulse signals, POHFP[4], POHFP[7]
and POHFP[10], identify the BIP-2 error indication for the odd-numbered bits of
the first tributary (TU #1 of TUG2 #1 STS-1 #1) on RAD[2], RAD[3] and RAD[4]
respectively. When a TUG3 is bypassed by setting corresponding TUGEN bit in
the VTPP Configuration register low, no performance monitoring is performed on
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
405
PMC [ PMC-SIERRA, INC ]
