PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
PIBYP:
When set high, the pointer bypass enable (PIBYP) bit configures the tributary
payload processor to disable tributary pointer interpretation for the incoming
STS-1 #1 (TUG3 #1). Pointer interpretation is performed by an external
upstream pointer interpreter. Tributary payload bytes are identified by the
ITPL signal and tributary payload frame boundaries are identified by the ITV5
signal. Tributary path AIS can be indicated by the IAIS signal. When PIBYP is
set low, normal tributary pointer processing is performed on the incoming data
stream.
TUGBYP:
The TUG bypass enable (TUGBYP) bit enables bridge monitoring of
tributaries in STS-1 #1 (TUG3 #1). When TUGBYP is set high, control and
data signals in the incoming data stream are transferred to the outgoing data
stream unmodified. The amount of delay from the incoming to the outgoing
data stream is a function of the internal data-path pipeline delay and
GSCLK_FP input. See the bypass functional timing diagram for details.
Performance monitoring by VTPP #1, RTOP #1 and RTTB #1 remains active
while consequential actions are disabled. When TUGBYP is set low, STS-1
#1 (TUG3 #1) is processed normally. TUGBYP is ignored when TUGEN is set
low.
Before the TUG bypass is disabled, it is essential to first set the
NOIC1J1PLBYP bit in the STP VTPP #1 Configuration #2 register high. This
will ensure that the re-transmission of the corresponding input Telecom Bus
signals, IC1J1 and IPL, to the output Telecom Bus is terminated gracefully.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
164
PMC [ PMC-SIERRA, INC ]
