PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
13
OPERATION
13.1 Configuration Options
The TUPP+622 consists of four independent STM-1 (STS-3) tributary processors
(STP), each having the equivalent functionality of a TUPP-PLUS (PM5362)
device. STP #1, #2, #3 and #4 process the STM-1 #1, #2, #3 and #4 streams,
respectively. Each STP consists of three sets of tributary payload processor
(VTPP), tributary path overhead processor (RTOP) and tributary trace buffer
(RTTB). Each VTPP, RTOP and RTTB set deals with the portion of the SONET
frame that corresponds to an STS-1 SPE. Equivalently, each VTPP, RTOP and
RTTB set deals with the portion of the SDH frame that corresponds to a VC3
together with the 2 columns of fixed stuff that are added when mapping a VC3
into an AU3. By coordinating the operation of the three VTPPs, RTOPs and
RTTBs in an STP, they can process the portion of an SDH frame that
corresponds to a VC4. The coordination that may be required between the three
VTPPs relates to the J1 byte marker and the encoding of the tributary multiframe
into the H4 byte. When processing a VC4 that carries three TUG3s, the
alignment provided by the J1 byte marker and the H4 byte of the VC4 must be
distributed to all VTPPs, RTOPs and RTTBs in an STP. When processing STS-1
SPEs, or equivalently, VC3s carried within AU3s, each VTPP, RTOP and RTTB
set receives its own J1 byte marker and H4 byte. Coordination is accomplished
as follows: The tributary multiframe alignment that is detected by VTPP #1 is
distributed to the two other VTPPs which do not receive valid H4 bytes. In
addition, the input demultiplexer will stretch the pulse captured on the IC1J1 input
for the corresponding STM-1 stream that marks the VC4 J1 byte so that it marks
the next two bytes. During the demultiplexing process this effectively feeds a "J1"
marker to the two "slaved" VTPPs.
The modes of operation of the TUPP+622 are summarized as follows:
STS-1 Mode: This is default. Each STS-1 in an STM-1 stream is assumed to
carry seven VT groups, each of which can be independently configured to carry
VT1.5s, VT2s, VT3s, or VT6s. The associated IC1J1 input is expected to mark
the J1 byte of each STS-1 SPE and each VTPP detects the tributary multiframe
encoded in the unique H4 byte that it receives.
AU3 Mode: This is also the default, as is corresponds exactly to STS-1 mode,
except for nomenclature. Each AU3 in an STM-1 stream is assumed to carry
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
376
PMC [ PMC-SIERRA, INC ]
