STANDARD PRODUCT
PM4328 TECT3
DATASHEET
PMC-2011596
ISSUE 1
HIGH DENSITY T1/E1 FRAMER
AND M13 MULTIPLEXER
Figure 39: DS3 Line Loopback Diagram
F
MX12 #7
MX12 #6
RCLK
R
M
RPOS/
DS3
F
RDAT
FRMR
R
RNEG/
RLCV
F
MX12 #5
R
M
R
R
F
MX12 #4
M
R
R
MX12 #3
MX23
F
M
R
R
F
MX12 #2
MX12 #1
M
R
TCLK
F
R
M
TPOS/
DS3
R
TDAT
TNEG/
TMFP
R
TRAN
M
R
DS2 Demultiplex Loopback
DS2 Demultiplex Loopbacks allow each of the seven demultiplexed DS2 streams
to be looped back into the MX23 and multiplexed up into the transmit DS3
stream. This overrides the tributary DS2 streams coming from the MX12s. The
DS2 loopback mode is shown diagrammatically in Figure 40 and is enabled via
the MX23 Loopback Activate register.
Figure 40: DS2 Loopback Diagram
F
MX12 #7
RCLK
R
RPOS/
RDAT
RNEG/
RLCV
DS3
F MX12 #6
M
R
FRMR
F MX12 #5
R
M
R
MX23
R
F MX12 #4
M
R
R
Optional
DEMUX AIS
Insertion
F MX12 #3
F MX12 #2
F MX12 #1
DS2 Tributary Loopback path
TCLK
M
R
R
M
R
R
M
R
TPOS/
DS3
TDAT
TNEG/
TMFP
R
TRAN
M
R
.
PROPRIETARY AND CONFIDENTIAL
156
PMC [ PMC-SIERRA, INC ]
