PM5364 pmc-sierra, PM5364 Datasheet - Page 249

• Manufacturer Part Number: PM5364
• Description: Tupp 2488 Assp Telecom Standard
• Manufacturer: pmc-sierra

14.2
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
Line Egress Parallel TelecomBus
Figure 66 shows the timing of the Line Egress TelecomBus interface. Timing is provided by
REFCLK. SONET/SDH data is carried in the EDATA[X][7:0], where ‘X’ denotes one of the
four sections of the Line Egress TelecomBus. The bytes are arranged in order of transmission in
an STS-12/STM-4 stream. The STSI block can be used to rearrange timeslots between the
system side and the line side of the SPECTRA 2488.
The timeslot naming strategy and assignment is shown in Figure 66. Each transport/section
overhead byte is labeled by Sx,y and type. Payload bytes are labeled by Sx,y and Bn, where ‘n’
is the active offset of the byte. Within Sx,y, the STS-3/STM-1 number is given by ‘x’ and the
column number within the STS-3/STM-1 is given by ‘y’. The EPL[X] signal is set high to mark
payload bytes and is set low at all other bytes. All four EJ0J1[4:1] signals are set high with all
four EPL[4:1] signals set low to mark the J0 (C1) byte of a transport frame. EJ0J1[X] is set high
with EPL[X] also set high to mark the J1 byte of all the streams within EDATA[X][7:0]. High
order streams in alarm are indicated by the EAIS[X] signal. This signal is used for low order
tributary alarms when PP loopback is enabled.
In Figure 45, timeslots S1,x, S2,y, and S4,z are configured for STS-1/STM-0 operation.
Timeslot S3,n is configured for STS-3c/STM-1 operation. Stream S1,1 (STM-1 #1, AU3 #1) is
shown to have an active offset of 522 by the high level on EPL[X] and EJ0J1[X] at byte
S1,1/B522. Stream S2,1 (STM-1 #2, AU3 #1) is shown to be in high-order path alarm (EAIS[X]
set high at bytes S2,1/Z0, S2,1/B522, S2,1/H3 and S2,1/B0). STM-1 #3 is a configured in AU4
mode and is shown to undergo a negative pointer justification event, changing its active offset
from 0 to 782. This is shown by EJ0J1[X] being set high at byte S3,1/H3 and EPL[X] being set
high at bytes S3,1/H3, S3,2/H3 and S3,3/H3. Stream S4,1 is shown to undergo a positive pointer
justification event as indicated by the low level on EPL[X] at byte S4,1/B0. Stream S4,2 is
shown to undergo a negative pointer justification event as indicated by the high level on EPL[X]
at byte S4,2/H3.
For the case where an STS-48c/STM-16c is carried on the four buses EDATA[4:1][7:0], the
J0 indication is given on all four buses (EJ0J1[X] = 1 and EPL[X] = 0) at the same time. The J1
indication is given only on the first bus (EJ0J1[1] = 1 and EPL[1] = 1, EJ0J1[4:2] = 0 and
EPL[1] = 1).
The arrangement shown in Figure 66 is for illustrative purposes only; other configurations,
alarm conditions, active offsets and justification events, etc. are possible.
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
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