QT2022/32 - Data Sheet: DS3051
A 4-bit counter is implemented, which conveys the count of interleaved bit blocks that have been detected in error
by the Path BIP-8 code (B3). This count has nine legal values, namely 0 to 8 errors. The counter is passed to the
TX WIS for composing the G1 octet. The WIS receiver monitors G1 to count the number of remote B3 errors. The
near-end 16-bit counter value is stored in 2.59 and the far-end 16-bit counter value is stored in 2.37.
7.2.9 Receive Payload Mapping
Figure 13: Receive Bit Relabelling Function
Data-units to WIS Service Interface
Next Octet Processed
First Octet Processed
rx_data-unit<15:0>
LSB
0
1
2
2
3
4 5
6
7
8
1
9 10 11 12 13 14 15
MSB
LSB
SPE octets
MSB
1
3
4
5
6
7
8
2
3
4 5
6
7
8
Higher-numbered (Odd) Octet in SPE
Last
lower-numbered (Even) Octet in SPE
First
Reception Order
Data from frame reception process
The Receive payload mapping maps the octets in the SPE payload capacity to a continuous stream of data-units
that are supplied to the PCS via the rx_data-unit<15:0> parameter of the WIS_UNITDATA.indicate primitive of the
WIS Service Interface. Within each data-unit, rx_data-unit<7:0> is mapped to a lower-numbered (even) octet in the
SPE capacity, and rx_data-unit<15:8> is mapped to the next high-numbered (odd) octet.
A bit relabelling function is performed to map the bit numbering and ordering conventions followed by the Receive
process (which follows the bit numbering and ordering conventions of SONET/SDH to those required by the WIS
Service Interface. The relabelling function is performed as shown in Figure 13. Bit 1 of the lower-numbered (even)
octet within the received SONET SPE is renumbered as bit 0 of rx_data-unit<15:0> at the WIS Service Interface,
bit 8 of the high-numbered octet within the SONET SPE is renumbered as bit 15 of rx_data-unit<15:0>, and the
rest of the bits are renumbered in corresponding sequence.
7.2.10 Test Pattern Checker
The QT2032 provides WIS compliant test pattern checking features. Please refer to Section 11.5, “WIS Test Fea-
tures (QT2032 only),” on page 102 for details.
7.3 Extended WIS Features
The QT2032 integrates a series of features common for SONET framer that are not supported by the WIS Clause.
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