DS3170 Maxim Integrated Products, DS3170 Datasheet - Page 107

• Manufacturer Part Number: DS3170
• Description: Network Controller & Processor ICs DS3-E3 Single-Chip T ransceiver T3-E3 Fra
• Manufacturer: Maxim Integrated Products

Figure 10-25. B3ZS Signatures
Figure 10-26. HDB3 Signatures
BPV detection checks the bipolar signal for bipolar violation (BPV) errors and E3 code violation (CV) errors. A BPV
error is declared if two 1’s are detected on RXP or RXN without an intervening 1 on RXN or RXP, and the 1’s are
not part of a B3ZS/HDB3 signature, or when both RXP and RXN are a one. An E3 coding violation is declared if
consecutive BPVs of the same polarity are detected (ITU O.161 definition). E3 CVs are accumulated in the BPV
counter (LINE.RBPVCR register) if E3 CV detection has been enabled (applicable only in HDB3 mode), otherwise,
BPVs are accumulated in the BPV counter. If zero code suppression is disabled, the BPV counter will count all
bipolar violations. The BPV counter will count pulses on the RLCV pin when the device is configured for unipolar
mode.
Immediately after a reset (or datapath reset) or a LOS condition, a BPV will not be declared when the first valid one
(RPOS high and RNEG low, or RPOS low and RNEG high) is received. Bipolar to unipolar conversion converts the
AMI bipolar data into a unipolar signal by OR’ing together the RXP and RXN signals.
(RX DATA)
(RX DATA)
(RX DATA)
(RX DATA)
RLCLK
RLCLK
RPOS
RNEG
RLCLK
RNEG
RPOS
RNEG
RPOS
RLCLK
RNEG
RPOS
V
V
107 of 230
V
V
V
V
HDB3 SIGNATURE WHEN
LINE.RCR.RZSF = 1
B3ZS SIGNATURE WHEN
LINE.RCR.RZSF = 1
HDB3 SIGNATURE WHEN
LINE.RCR.RZSF = 0
B3ZS SIGNATURE WHEN
LINE.RCR.RZSF = 0
DS3170 DS3/E3 Single-Chip Transceiver