PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
10.21 APS Serial Data Interface
The APS Serial Data Interface consists of a input and output 777.76 Mbps serial TeleCombus
used to communicate between a working and protect mate for APS applications.
10.21.1 Output APS Serial Data Interface (D8E, APISO, TXLV)
The Output APS Serial Data Interface uses the four sets of D8E, APISO and TXLV blocks to
transmit a SONET (SDH) stream to a working or protect mate. The SONET (SDH) OC-48 stream
is selected from either the THPP or SVCA block and serialized on a 777.76 Mbps serial
TeleCombus. When the S/UNI-2488 is configured as the working mate, the Output APS Serial
Data Interface selects the transmit path processed SONET (SDH) stream from the THPP block
and transmits it through the 4 differential LVDS pairs, APSO+/-[4:1] to the protect mate where the
stream is line and section processed. When the S/UNI-2488 is configured as the protect mate,
the Output APS Serial Data Interface selects receive path terminated SONET (SDH) stream from
the SVCA block and transmit it through the 4 differential LVDS pairs, APSO+/-[4:1] to the working
mate. The working mate will then process the SONET (SDH) payload (ATM or POS) and pass
the results to the system via the UTOPIA Level 3 or POSPHY Level 3 interface.
There are four sets of DE8, APISO and TXLV blocks. Each set implements one of four serial
streams that make up the output serial TelecomBus. The D8E block takes a SONET (SDH)
stream and 8B/10B encodes it. The APISO block performs a parallel to serial conversion. The
TXLV block is a differential LVDS transmitter.
10.21.2 Input APS Serial Data Interface (RXLV, DRU, R8TB)
The Input APS Serial Data Interface uses the four sets of RXLV, DRU and R8TB blocks to receive
a SONET (SDH) stream from a working or protect mate via a serial TelecomBus. The received
SONET (SDH) OC-48 stream is passed to either the RCFP or TRMP block for further processing.
When the S/UNI-2488 is configured as the working mate and when a failure condition exists, a
receive path processed SONET (SDH) stream is expected from the protect mate on the 4
differential LVDS pairs, APSI+/-[4:1]. The S/UNI-2488 will pass this received stream to the RCFP
for ATM or POS payload processing. When the S/UNI-2488 is configured as the protect mate and
when a failure condition exists, a transmit path processed SONET (SDH) stream is expected from
the working mate on the 4 differential LVDS pairs, APSI+/-[4:1]. The S/UNI-2488 will pass this
received stream to the TRMP for SONET line and section insertion before it is transmitted.
There are four sets of RXLV, DRU and R8TB blocks. Each set implements one of four serial
streams that make up the input serial TelecomBus. The RXLV block is a differential LVDS
receiver. The DRU recovers the 777.76 Mbps 8B/10B encoded serial stream and deserializes it
for the R8TB block. The R8TB block converts the deserialized 8B/10B stream into the a SONET
(SDH) stream.
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
82
PMC [ PMC-SIERRA, INC ]
