DS3174+ Maxim Integrated Products, DS3174+ Datasheet - Page 81
![IC TXRX DS3/E3 QUAD 400-BGA](/photos/6/87/68748/400-bga_21-0306_sml.jpg)
DS3174+
Manufacturer Part Number
DS3174+
Description
IC TXRX DS3/E3 QUAD 400-BGA
Manufacturer
Maxim Integrated Products
Datasheet
1.DS3171N.pdf
(234 pages)
Specifications of DS3174+
Function
Single-Chip Transceiver
Interface
DS3, E3
Number Of Circuits
4
Voltage - Supply
3.135 V ~ 3.465 V
Current - Supply
725mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
400-BGA
Includes
DS3 Framers, E3 Framers, HDLC Controller, On-Chip BERTs
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
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DS3171/DS3172/DS3173/DS3174
The multiframe framer checks for a multiframe boundary. When the multiframe framer identifies a multiframe
boundary, it updates the data path frame counters if either an OOF or OOMF condition is present. The multiframe
framer waits until a subframe boundary has been identified. Then, each bit position is checked for the multiframe
boundary. The multiframe boundary is found by identifying the three multiframe alignment bits (M-bits). Since there
are seven multiframe bits and three bits are required to identify the multiframe boundary, up to 9 checks may be
needed to find the multiframe boundary. Once the multiframe boundary is identified, it is checked in each
subsequent frame. The data path frame counters are updated if the three multiframe alignment bits are error free,
and an OOF or OOMF condition exists. If the multiframe framer checks more than fifteen multiframe bit (X-bits, P-
bits, and M-bits) positions without identifying the multiframe boundary, the multiframe framer times out, and forces
the subframe framer back into the load state. Refer to Figure 10-16 for the multiframe framer state diagram.
10.6.4.1.2 Receive DS3 Performance Monitoring
Performance monitoring checks the DS3 frame for alarm conditions and errors. The alarm conditions detected are
OOMF, OOF, SEF, LOF, COFA, LOS, AIS, Idle, RUA1, and RDI. The errors accumulated are framing, P-bit parity,
C-bit parity (C-bit format only), and Far-End Block Error (FEBE) (C-bit format only) errors.
An Out Of MultiFrame (OOMF) condition is declared when a multiframe alignment bit (M-bit) error has been
detected in two or more of the last four consecutive DS3 frames, or when a manual resynchronization is requested.
An OOMF condition is terminated when no M-bit errors have been detected in the last four consecutive DS3
frames, or when the DS3 framer updates the data path frame counters. Figure 10-16 shows the multiframe framer
state diagram.
Figure 10-16. DS3 Multiframe Framer State Diagram
Sync
Timeout
Verify
Load
2 multiframe loaded
If multiframe alignment OOF is disabled, an Out Of Frame (OOF) condition is declared when three or more out of
the last sixteen consecutive subframe alignment bits (F-bits) have been errored, or a manual resynchronization is
requested. If multiframe alignment OOF is enabled, an OOF condition is declared when three or more out of the
last sixteen consecutive F-bits have been errored, when an OOMF condition is declared, or when a manual
resynchronization is requested. If multiframe alignment OOF is disabled, an OOF condition is terminated when
none of the last sixteen consecutive F-bits has been errored, or when the DS3 framer updates the data path frame
counters. If multiframe alignment OOF is enabled, an OOF condition is terminated when an OOMF condition is not
81
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