DS3163 Maxim Integrated Products, DS3163 Datasheet - Page 170
DS3163
Manufacturer Part Number
DS3163
Description
IC TRPL ATM/PACKET PHY 400-PBGA
Manufacturer
Maxim Integrated Products
Datasheet
1.DS3163.pdf
(384 pages)
Specifications of DS3163
Applications
*
Mounting Type
Surface Mount
Package / Case
400-BGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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10.10.7 G.751 E3 Framer/Formatter
10.10.7.1 Transmit G.751 E3 Frame Processor
The G.751 E3 frame format is shown in
Figure
10-41. FAS is the Frame Alignment Signal. A is the Alarm indication
bit used to indicate the presence of an alarm to the remote terminal equipment. N is the National use bit reserved
for national use.
Figure 10-41. G.751 E3 Frame Format
FAS
A N
4 Rows
1524 Bit Payload
384 bits
10.10.7.2 Transmit G.751 E3 Frame Generation
G.751 E3 frame generation receives the incoming payload data stream, and overwrites the entire E3 overhead bit
locations.
The first 10 bits of the frame are overwritten with the frame alignment signal (FAS), which has a value of
1111010000b.
The eleventh bit of the frame is overwritten with the alarm indication (A) bit. The A bit can be generated
automatically, sourced from the transmit FEAC controller, set to one, or set to zero. The A bit source is
programmable (automatic, FEAC, 1, or 0). If the A bit is generated automatically, it is set to one when one or more
of the indicated alarm conditions is present, and set to zero when all of the indicated alarm conditions are absent.
Automatically setting RDI on LOS, LOF, or AIS is individually programmable (on or off).
The twelfth bit of the frame is overwritten with the national use (N) bit. The N bit can be sourced from the transmit
FEAC controller, sourced from the transmit HDLC overhead controller, set to one, or set to zero. The N bit source
is programmable (FEAC, HDLC, 1, or 0). Note: The FEAC controller will source one bit per frame regardless of
whether the A bit only, the N bit only, or both are programmed to be sourced from the FEAC controller.
Once all of the E3 overhead bits have been overwritten, the data stream is passed on to error insertion. If frame
generation is disabled, the incoming E3 signal is passed on directly to error insertion. Frame generation is
programmable (on or off).
10.10.7.3 Transmit G.751 E3 Error Insertion
Error insertion inserts framing errors into the frame alignment signal (FAS). The type of error(s) inserted into the
FAS is programmable (errored FAS bit or errored FAS). An errored FAS bit is a single bit error in the FAS. An
errored FAS is an error in all ten bits of the FAS (a value of 0000101111b is inserted in the FAS). Framing error(s)
can be inserted one error at a time, or in four consecutive frames. The framing error insertion number (single or
four) is programmable.
Single error insertion mode inserts an error at the next opportunity when requested. The multi-error insertion mode
inserts the indicated number of errors at the next opportunities when requested. I.e., a single request will cause
multiple errors to be inserted. The requests can be initiated by a register bit (TSEI) or by the manual error insertion
input (TMEI). The error insertion initiation type (register or input) is programmable. The insertion of each particular
error type is individually enabled.
Once all error insertion has been performed, the data stream is passed on to overhead insertion.
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