PM5364 pmc-sierra, PM5364 Datasheet - Page 267

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

14.8
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
Figure 81 HRPOH Timeslot for STS-12c/VC4-4c
Legal Mix
The HRPOH port can also extract high-order path overheads from any legal mixture of
payloads. Figure 82 shows an example of an STS-12/STM-4 data stream carrying 2 STS-
3c/VC4 and 6 STS-1/STM-0.
Figure 82 HRPOH Timeslot for Mixture of 2 STS-3c/VC4 and 6 STS-1/STM-0
High Order Transmit Path Overhead
The High Order Transmit Path Overhead (HTPOH) port (ETPL_HTPOH, EIDLE_HTPOHEN
and EV5_HTPOHRDY) is used to insert path overhead bytes to the egress data stream. The
POH bytes are input on HTPOH MSB first in the same order that they are transmitted. To
simplify description, ETPL_HTPOH, EIDLE_HTPOHEN and EV5_HTPOHRDY are denoted
as HTPOH, HTPOHEN and HTPOHRDY respectively in this section when not in PP loopback
mode.
HTPOH port signals are referenced to the HPOHCLK on the received side. POH bytes on
HTPOH shall align with the receive side HPOHFP signal. The HPOHFP and HTPOHRDY
signals are updated on the falling edges of HPOHCLK, and HTPOH and HTPOHEN are
sampled on the rising edges of HPOHCLK.
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
267