RS8953 Conexant Systems, Inc., RS8953 Datasheet - Page 66

• Manufacturer Part Number: RS8953
• Description: High-bit-rate Digital Subscriber Line (hdsl) Channel unit
• Manufacturer: Conexant Systems, Inc.

3.0 Circuit Descriptions
3.6 PRA Function
Figure 3-27. An Overview of the PRA Transfer of Data
3.6.1 Transferring Data from HDSL to RSER
3-34
NOTE(S):
TE - Termination Equipment
ET - Exchange Termination
M - Monitor
ET - Exchange Termination
TE
RMSYNC
TMSYNC
RSER
TSER
3.6 PRA Function
This document specifies requirements for using the integrated service digital
network.
Termination Equipment (TE) and the Exchange Termination (ET).
The following functions are available when transferring data from HDSL to
RSER: CRC4 monitoring, E-bit insertion, E-bits counter, and CRC4 generator.
HDSL—is checked for error blocks by using the CRC4 procedure, as specified in
CCITT recommendation G.704[9], subclause 2.3.3. The check result, represented
in E-bits, is inserted into the data stream in the appropriate location.
insertion: New values are inserted for the E-bits, or the E1 data stream remains
untouched. If new values are inserted, an external CPU must be used to program
the value of these bits. The E-bit insertion mode is repeated each E1 frame until
another value is programmed, or until another mode is selected.
count the amount of E-bits reflected by the E1 stream. This information is
received via HDSL. This counter wraps around on full count. The value of the
counter needs to be accessible to an external CPU. The counter is reset upon
reading the value.
When CRC4 monitoring is enabled, E1 data—which is received via
When CRC4 monitoring is disabled, two options are available for E-bit
The E-bits counter is continuously enabled and causes an 8-bit counter to
E-bits
G
M
RS8953B
Figure 3-27
E-bits
M
G
Conexant
shows an overview of the HDSL link between the
HDSL
E-bits
G
M
RS8953B
E-bits
M
G
RMSYNC
TMSYNC
RESER
TSER
RS8953B/8953SPB
HDSL Channel Unit
ET
N8953BDSB