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PM5366-PI Datasheet(PDF) 182 Page - PMC-Sierra, Inc |
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PM5366-PI Datasheet(HTML) 182 Page - PMC-Sierra, Inc |
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182 / 267 page  PRELIMINARY PM5366 TEMAP-84 DATASHEET PMC-2010672 ISSUE 1 HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER PROPRIETARY AND CONFIDENTIAL 170 Figure 21 - T1/E1 Diagnostic Digital Loopback T1/E1 JAT84 TTMP (bit) RTDM (bit) M13 M13 M13 M13 M13 M13 M13 M13 DS3/E3 FRMR M13 M13 DS3/E3 TRAN TRAP M13 M13 VTPP M13 M13 VTPP M13 M13 SIPO M13 M13 PISO M13 M13 D3MA M13 M13 D3MD Telecom Bus Telecom Bus LIUs LIUs SBI 155 TTOP M13 M13 RTOP/ RTTB T1/E1 JAT84 EXSBI INSBI INSBI (byte) EXSBI (byte) Egress Flexible B/W Port Ingress Flexible B/W Port DS3/E3 Tx System I/F DS3/E3 Rx System I/F T1/E1 FRM R84 Diagnostic Loopback 12.9 DS3 and E3 Loopback Modes The TEMAP-84 provides two E3 and three DS3 M13 multiplexer loopback modes to aid in network and system diagnostics at the DS3 interface. The DS3 loopbacks can be initiated via the µP interface whenever the DS3 framer/M13 multiplexer is enabled. The DS3 and E3 Master Data Source register controls the DS3 loopback modes. These loopbacks are also available when the DS3 mux is used with the DS3 mapper via the telecom bus interface. DS3 and E3 Diagnostic Loopback DS3 and E3 Diagnostic Loopback allows the transmitted DS3 or E3 stream to be looped back into the receive DS3 or E3 path, overriding the DS3 or E3 stream received on the RDAT/RPOS and RNEG/RLCV inputs. The RCLK signal is also substituted with the transmit DS3 clock, TCLK. While this mode is active, AIS may be substituted for the DS3 payload being transmitted on the TPOS/TDAT and TNEG/TMFP outputs. The configuration of the receive interface determines how the TNEG/TMFP signal is handled during loopback: if the UNI bit in the DS3 FRMR register is set, then the receive interface is configured for RDAT and RLCV, therefore the TNEG/TMFP signal is suppressed during loopback so that transmit MFP indications will not be seen nor accumulated as input LCVs. If the UNI bit is clear, then the interface is configured for bipolar signals RPOS and RNEG, therefore the TNEG is fed directly to the RNEG input. This diagnostic |
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