PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
This diagram also applies to the AU3 mode as it is equivalent to STS-1 mode,
except for nomenclature.
Figure 19
- STM-1 Input Bus Timing - Complex STS-1 / AU3 Case
SCLK
IC1J1[n]
IPL[n]
••••
ITMF[n]
(ITMFH4=0)
A1 A1 A1 A2 A2 A2 C1 C1 C1 J1
H1 H1 H1 H2 H2 H2 H3 J1 H3
V1
V1
ID[7:0] (n=1)
ID[15:8] (n=2)
ID[23:16] (n=3)
ID[31:24] (n=4)
Negative stuff byte
for STS-1 #2 SPE
which happens to
carry the J1 byte
STS-1 #1 SPE J1 byte
V1 byte of first tributary in STS-1 #2
Positive stuff for STS-1 #3 SPE
V1 byte of second tributary in STS-1 #2
The timing of the TUPP+622 input buses when it is in STM-1 (STS-3) input
interface mode (IHSMODEB set high) is illustrated in Figure 20 where n is {1, 2,
3, 4}. This diagram shows the relationships of the input signals in STS-1 mode
associated with each of the four input buses. Data on ID[7:0] (ID[15:8], ID[23:16],
ID[31:24]) is sampled on the rising edge of SCLK. The IC1J1[1] (IC1J1[2],
IC1J1[3], IC1J1[4]) signal pulses high when IPL[1] is set low to mark the position
of the C1 byte of the first STS-1 stream in every frame of the STS-3 transport
envelope. IC1J1[1] (IC1J1[2], IC1J1[3], IC1J1[4]) pulses high when IPL[1] (IPL[2],
IPL[3], IPL[4]) is set high to mark the J1 byte in each STS-1 stream. IPL[1]
(IPL[2], IPL[3], IPL[4]) identifies the SPE bytes on ID[7:0] (ID[15:8], ID[23:16],
ID[31:24]). The ITMF[1] (ITMF[2], ITMF[3], ITMF[4]) input marks the frame
containing V1 bytes. It is sampled only at the first V1 byte position of the first
STS-1 stream. The bytes forming the various tributary synchronous payload
envelopes are identified by the ITPL[1] (ITPL[2], ITPL[3], ITPL[4]) signal being
set high when the VT/TU pointer interpretation is disabled. The ITV5[1] (ITV5[2],
ITV5[3], ITV5[4]) signal pulses high to mark the V5 bytes of each incoming
tributary when the VT/TU pointer interpretation is disabled. In this example, all
STS-1 SPEs are aligned to the STS-3 transport envelope such that the J1 bytes
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
391
PMC [ PMC-SIERRA, INC ]
