PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
Pin Name
Type
Pin
No.
Function
POHCK
Output L2
The tributary path overhead clock (POHCK)
signal provides timing to sample the extracted
tributary path overhead stream and the receive
alarm port for STM-1 #1, #2, #3 and #4. POHCK
is a nominally 9.72 MHz clock. The POH[12:1],
POHEN[12:1], POHFP[12:1] and RAD[4:1]
outputs are updated on the falling edge of
POHCK.
POH[1]
POH[2]
POH[3]
Output L4
The tributary path overhead (POH[3:1]) signals
contain the tributary path overhead bytes (V5,
J2, Z6 and Z7) extracted from the incoming
STM-1 #1 stream. POH[1], POH[2] and POH[3]
contain the tributary path overhead bytes from
STS-1 (AU3) #1, #2 and #3, respectively. In AU4
mode, POH[1], POH[2] and POH[3] contain the
tributary path overhead bytes from TUG3 #1, #2
and #3, respectively. All four tributary overhead
bytes of each tributary is shifted out once per
payload frame. The corresponding POHEN
signal is set high to identify overhead bytes that
are presented for the first time. Each POH signal
is updated on the falling edge of POHCK.
M3
P2
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
73
PMC [ PMC-SIERRA, INC ]
