RS8953 Conexant Systems, Inc., RS8953 Datasheet - Page 68
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RS8953
Manufacturer Part Number
RS8953
Description
High-bit-rate Digital Subscriber Line (hdsl) Channel unit
Manufacturer
Conexant Systems, Inc.
Datasheet
1.RS8953.pdf
(173 pages)
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3.0 Circuit Descriptions
3.6 PRA Function
3.6.5 Inserting Data Transferred from TSER to HDSL
3-36
the E-bits must pass transparently (from the input TSER). If new values are
inserted, these bits are obtained by enabling an external CPU to program a 2-bit
register.
count the amount of E-bits errors. It wraps around on full count. An external CPU
must be available to read the value of the counter. The counter is reset upon
reading the value.
a CRC4 generator. The CRC bits are inserted into the correct location of the data
stream (TSER) according to the CRC4 procedure which is specified in CCITT
recommendation G.704.
bits, or the CRC4 bits can be passed transparently (from the input TSER). If new
values are inserted, the new value is stored in a 4-bits register and is repeatedly
inserted into the correct location of the data stream. This insertion process is
continuously repeated until a new mode is selected.
If CRC4 monitoring is disabled, new values must be inserted into the E-bits, or
The E-bits counter is continuously enabled and causes an 8-bit counter to
The CRC4 generator, when enabled, causes the E1 data (TSER) to be fed into
If the CRC4 generator is disabled, new values can be inserted for the CRC4
• Each A-bit and SA4, SA5, SA7, and SA8 bit may be selected as
• The SA6 bits may be transferred either transparently or non-transparently.
• The FAS bits may be transferred either transparently or non-transparently.
transparent or non-transparent. For non-transparent bits, the new value of
the certain bit is stored in a register and is inserted into the correct location
of the data stream (TSER).
Selecting transparent or non-transparent affects all four SA6 bits. For
non-transparent transfers, the new value of the bits is stored in a register
and is inserted into the correct location of the data stream (TSER).
Selecting transparent or non-transparent affects all the FAS bits. For
non-transparent bits, the FAS value is inserted into the correct location of
the data stream (TSER). The FAS is a constant pattern.
Conexant
RS8953B/8953SPB
HDSL Channel Unit
N8953BDSB
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