XRT72L13 Datasheet, PDF (286/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
áç
PRELIMINARY
TABLE 24: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 4 (TX AIS PATTERN) WITHIN THE TX DS3
CONFIGURATION REGISTER, AND THE RESULTING TRANSMIT DS3 FRAMER BLOCK'S ACTION
BIT 4
TRANSMIT DS3 FRAMER'S ACTION
0 _{Normal Operation:}
The Overhead bits are either internally generated, or they are inserted via the "Transmit Overhead Data Input
Interface" or the "Transmit HDLC Controller" blocks. The Payload bits are received from the "Transmit Payload
Data Input Interface".
1 _{Transmit AIS Pattern:}
When this command is invoked, the Transmit DS3 Framer block will do the following.
• Set the X-bits to "1"
• Set all the C-bits to "0"
• Generate valid M, F, and P bits
Overwrite the data in the DS3 payload with a repeating "1010..." pattern
NOTE: This bit is ignored when the TxLOS bit is set.
4.2.4.2.1.5 Transmit LOS Pattern - Bit 3
This "read/write" bit field allows the user to transmit
an LOS (Loss of Signal) pattern to the "remote termi-
nal", upon software control. Table 25 relates the
contents of this bit field to the Transmit DS3 Framer
block's action.
TABLE 25: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 3 (TX LOS) WITHIN THE TX DS3 CONFIGURATION
REGISTER, AND THE RESULTING TRANSMIT DS3 FRAMER BLOCK'S ACTION
BIT 3
0
1
TRANSMIT DS3 FRAMER'S ACTION
Normal Operation:
The Overhead bits are either internally generated, or they are inserted via the "Transmit Overhead Data Input
Interface" or the "Transmit HDLC Controller" blocks. The Payload bits are received from the "Transmit Pay-
load Data Input Interface".
Transmit LOS Pattern:
When this command is invoked the Transmit DS3 Framer will do the following.
• Set all of the overhead bits to "0" (including the M, F, and P bits)
Overwrite the DS3 payload bits with an "all zeros" pattern.
NOTE: When this bit is set, it overrides all of the other bits in
this register.
4.2.4.2.1.6 FERF (Far-End Receive Failure) on
LOS - Bit 2
This "Read/Write" bit-field allows the user to config-
ure the Transmit DS3 Framer block to automatically
generate a "Yellow Alarm" if the Near-End Receive
Section (of the XRT72L13) detects a "LOS" (Loss of
Signal) Condition.
Writing a "1" to this bit-field enables this feature. Writ-
ing a "0" to this bit-field disables this feature.
4.2.4.2.1.7 FERF (Far-End Receive Failure) on
OOF - Bit 1
This "Read/Write" bit-field allows the user to config-
ure the Transmit DS3 Framer block to automatically
generate a "Yellow Alarm" if the Near-End Receive
Section (of the XRT72L13) detects an "OOF (Out-of-
Frame) Condition".
Writing a "1" to this bit-field enables this feature. Writ-
ing a "0" to this bit-field disables this feature.
4.2.4.2.1.8 FERF (Far-End Receive Failure) on
AIS - Bit 0
This "Read/Write" bit-field allows the user to config-
ure the Transmit DS3 Framer block to automatically
generate a "Yellow Alarm" if the Near-End Receive
Section (of the XRT72L13) detects an AIS (Alarm In-
dication Signal) pattern.
Writing a "1" to this bit-field enables this feature. Writ-
ing a "0" to this bit-field disables this feature.
4.2.4.2.1.9 Transmitting FEBE (Far-End Block
Error) Values
274