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STANDARD PRODUCT
PM8315 TEMUX
DATASHEET
PMC-1981125
ISSUE 7
HIGH DENSITY T1/E1 FRAMER WITH
INTEGRATED VT/TU MAPPER AND M13 MUX
PROPRIETARY AND CONFIDENTIAL
114
without timing constraints. Programming for TTI buffers is done one buffer at a
time by first programming the shadow buffer, switching to the shadow buffer for
the desired tributary, updating the desired tributary identifier buffer and finally
switching back from the shadow buffer to the tributary buffer. Switching between
the shadow buffer and normal buffer is synchronized to the start of each identifier
on a per-tributary basis.
9.34 Transmit Remote Alarm Processor (TRAP)
When configured for SONET compatible operation, the TRAP SONET/SDH
Transmit Remote Alarm Processor processes remote alarm indications of
tributaries in an STS-3 stream. The virtual tributaries within an STS-1 stream
may be configured to accept either VT1.5 or VT2 tributary types. The TRAP may
also be configured for SDH compatible operation. The incoming STM-1 stream
may carry three AU3s or an AU4 with three TUG3s.
The TRAP may be configured to insert tributary remote defect indications
(RDI-V) and tributary remote error indications (REI-V) via the TTOP block.
These indications may originate from three sources:
(1) Based on alarms detected in tributaries received on the Telecom Drop
bus, LDDATA[7:0]. The exact behavior is configured using the
SONET/SDH Master Tributrary Remote Defect Indication Control Register
and the SONET/SDH Master Tributary Auxiliary Remote Defect Indication
Register.
(2) Based on two independent serial alarm ports, RADEAST and RADWEST.
REI indications are generated based on the sampled BIP-2 error values.
RDI indications are based on the sampled RDI (Remote Defect Indication)
and RFI (Auxiliary Remote Defect Indication) values.
(3) Using the FORCEEN feature in the TRAP Control Registers to manually
force desired values using the RDI (Remote Defect Indication) and RFI
(Auxiliary Remote Defect Indication) bits.
The source of alarm status can be configured on a per-tributary basis. As well,
alarm information from tributaries in any of the three sources of remote alarms
can be mapped to arbitrary tributaries in the outgoing data stream via the Indirect
Remote Alarm Tributary Register and the Indirect Datapath Tributary Register of
the TRAP block.
Two methods of encoding tributary remote alarms are supported: Non-extended
RDI and Extended RDI. This selection is made on a per-tributary basis by
setting the ERDI bits of the TRAP Control registers and the TTOP control
registers. In Non-extended RDI mode, RDI indications are encoded as a one bit