IBM3009K2672
IBM SONET/SDH Framer
APS Interface Connection for Multi-Device Operation
SONET/SDH Framer #1
TXAPSDAT(8:0)
ACHCLK
RXAPSDAT(8:0)
TXAPSPAR
TXAPSDAVA
RXAPSPAR
TXAPSDARQ
RXAPSDAVA
SONET/SDH Framer #2
TXAPSDAT(8:0)
ACHCLK
RXAPSDAT(8:0)
TXAPSPAR
TXAPSDAVA
RXAPSPAR
TXAPSDARQ
RXAPSDAVA
To up to two more SONET/SDH Framers
Common ACHCLK
Clock
The previous figure shows how the APS interfaces between SONET/SDH framers should be connected. It
should be noted that a common ACHCLK clock is required for all SONET/SDH framers. The skew between
the ACHCLK clocks should be taken into consideration to ensure set-up and hold times are met at the inter-
faces that are inputs. In multi-device operation where the SONET/SDH framers have different transmit refer-
ence clocks, pointer processing will need to be turned on and pointer adjustments in the transmit direction will
occur. Pointer processing does not need to be enabled if all of the SONET/SDH framers have the same trans-
mit reference clock.
ssframer.01
8/27/99
Block Diagram and Block Descriptions
Page 13 of 279
IBM [ IBM ]
