DS3172 Maxim Integrated, DS3172 Datasheet - Page 190
DS3172
Manufacturer Part Number
DS3172
Description
Network Controller & Processor ICs Dual DS3/E3 Single Chip Transceiver
Manufacturer
Maxim Integrated
Datasheet
1.DS3171.pdf
(234 pages)
Specifications of DS3172
Part # Aliases
90-31720-000
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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 E3 A bit to be set to one if transmit
automatic RAI is enabled.
Bit 6: Receive Alarm Indication on LOS Disable (RAILD) – When 0, an LOS condition will cause the transmit E3
A bit to be set to one if transmit automatic RAI is enabled. When 1, an LOS condition does not affect the RAI
signal.
Bit 5: Receive Alarm Indication on OOF Disable (RAIOD) – When 0, an OOF condition will cause the transmit
E3 A bit to be set to one if transmit automatic RAI is enabled. When 1, an OOF 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 E3
A bit to be set to one if transmit automatic RAI is enabled. When 1, an AIS condition does not affect the RAI signal.
Bit 3: Receive Overhead Masking Disable (ROMD) – When 0, the E3 overhead positions in the outgoing E3
payload will be marked as overhead by RDENn. When 1, the E3 overhead positions in the outgoing E3 payload will
be marked as data by RDENn.
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 condition at the FAS
check. This 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 each bit error in the FAS (up to 10 per frame).
10 = count frame alignment signal (FAS) errors (up to one per frame).
11 = reserved
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
190
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