DS3172N Maxim Integrated, DS3172N Datasheet - Page 179
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DS3172N
Manufacturer Part Number
DS3172N
Description
Network Controller & Processor ICs Dual DS3/E3 Single Chip Transceiver
Manufacturer
Maxim Integrated
Datasheet
1.DS3171.pdf
(234 pages)
Specifications of DS3172N
Part # Aliases
90-31720-N00
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Bit 13: Multi-frame Alignment OOF Disable (MAOD) – When 0, an OOF condition is declared whenever an
OOMF or SEF condition is declared. When 1, an OOF condition is declared only when an SEF condition is
declared.
Bit 12: Manual Downstream AIS Insertion (MDAISI) – When 0, manual downstream AIS insertion is disabled.
When 1, manual downstream AIS insertion is enabled.
Bit 11: Automatic Downstream AIS Disable (AAISD) – When 0, the presence of an LOS, OOF, or AIS condition
will cause downstream AIS to be inserted. When 1, the presence of an LOS, OOF, or AIS condition will not cause
downstream AIS to be inserted.
Bit 10: Error Count Control (ECC) – When 0, framing errors, P-bit parity errors, C-bit parity errors, and far-end
block errors will not be counted if an OOF or AIS condition is present. P-bit parity errors, C-bit parity errors, and far-
end block errors will also not be counted during the DS3 frame in which an OOF condition is terminated, and the
next DS3 frame. When 1, framing errors, P-bit parity errors, C-bit parity errors, and far-end block errors will be
counted regardless of the presence of an OOF or AIS condition.
Bits 9 to 8: Framing Error Count Control (FECC[1:0]) – These two bits control the type of framing error events
that are counted.
Bit 7: Receive Alarm Indication on LOF Enable (RAILE) – When 0, an LOF condition does not affect the receive
alarm indication signal (RAI). When 1, an LOF condition will cause the transmit DS3 X-bits to be set to zero if
transmit automatic RDI is enabled.
Bit 6: Receive Alarm Indication on LOS Disable (RAILD) – When 0, an LOS condition will cause the transmit
DS3 X-bits to be set to zero if transmit automatic RDI is enabled. When 1, an LOS condition does not affect the RAI
signal.
Bit 5: Receive Alarm Indication on SEF Disable (RAIOD) – When 0, an SEF condition will cause the transmit
DS3 X-bits to be set to zero if transmit automatic RDI is enabled. When 1, an SEF condition does not affect the RAI
signal.
Bit 4: Receive Alarm Indication on AIS Disable (RAIAD) – When 0, an AIS condition will cause the transmit DS3
X-bits to be set to zero if transmit automatic RDI is enabled. When 1, an AIS condition does not affect the RAI
signal.
Bit 3: Receive Overhead Masking Disable (ROMD) – When 0, the DS3 overhead positions in the outgoing DS3
payload will be marked as overhead by RDENn. When 1, the DS3 overhead positions in the outgoing DS3 payload
will be marked as payload data by RDENn. When this bit is set to one, the COVHD bit is ignored.
Bits 2 to 1: LOF Integration Period (LIP[1:0]) – These two bits determine the OOF integration period for
declaring LOF.
Bit 0: Force Framer Resynchronization (FRSYNC) – A 0 to 1 transition forces an OOF, SEF, and OOMF
condition. The bit must be cleared and set to one again to force another resynchronization
00 = count OOF occurrences (counted regardless of the setting of the ECC bit).
01 = count M bit and F bit errors.
10 = count only F bit errors.
11 = count only M bit errors.
00 = OOF is integrated for 3 ms before declaring LOF
01 = OOF is integrated for 2 ms before declaring LOF
10 = OOF is integrated for 1 ms before declaring LOF.
11 = LOF is declared at the same time as OOF.
179
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