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PM5366-PI Datasheet(PDF) 183 Page - PMC-Sierra, Inc

Part # PM5366-PI
Description  HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
PDF  267 Pages
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Manufacturer  PMC [PMC-Sierra, Inc]
Direct Link  http://www.pmc-sierra.com
Logo PMC - PMC-Sierra, Inc

PM5366-PI Datasheet(HTML) 183 Page - PMC-Sierra, Inc

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PRELIMINARY
PM5366 TEMAP-84
DATASHEET
PMC-2010672
ISSUE 1
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
AND M13 MULTIPLEXER
PROPRIETARY AND CONFIDENTIAL
171
loopback can be used when configured as a multiplexer or as a framer only. The
DS3 loopback mode is shown diagrammatically in Figure 22.
Figure 22
- DS3 Diagnostic Loopback Diagram
DS3/E3
FRMR
DS3/E3
TRAN
RCLK
RPOS/
RDAT
RNEG/
RLCV
TCLK
TPOS/
TDAT
TNEG/
TMFP
UNI
Optional
AIS
Insertion
DS3 and E3 Line Loopback
DS3 and E3 Line Loopbacks allow the received DS3/E3 streams to be looped
back into the transmit DS3/E3 paths, overriding the DS3/E3 streams created
internally by the framing unchannelized data or multiplexing of the lower speed
tributaries. The transmit signals on TPOS/TDAT and TNEG/TMFP are
substituted with the receive signals from RPOS/RDAT and RNEG/RLCV. The
TCLK signal is also substituted with the receive DS3/E3 clock, RCLK. While this
mode is active, AIS may be substituted for the DS3 payload being transmitted on
the TPOS/TDAT and TNEG/TMFP outputs. Note that the transmit interface must
be configured to be the same as the DS3/E3 FRMR receive interface for this
mode to work properly. The DS3/E3 line loopback mode is shown
diagrammatically in Figure 23. There is a second form of line loopback which
only loops back the DS3/E3 payload. In this mode the DS3 framing overhead is
regenerated for the received DS3/E3 stream and then retransmitted. Line
loopback is selected with the LLOOP bit in the DS3 and E3 Master Data Source
register and payload loopback is selected by the PLOOP bit in the same register.



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