PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 183
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PM5366-PI
Manufacturer Part Number
PM5366-PI
Description
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5366-PI.pdf
(267 pages)
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PRELIMINARY
DATASHEET
PMC-2010672
PROPRIETARY AND CONFIDENTIAL
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 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.
RNEG /
RPOS/
TNEG/
TPOS/
RDAT
TMFP
RCLK
RLCV
TDAT
TCLK
Insertion
Optional
- DS3 Diagnostic Loopback Diagram
AIS
ISSUE 1
UNI
DS3/E3
DS3/E3
FRMR
TRAN
171
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
AND M13 MULTIPLEXER
PM5366 TEMAP-84
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