XRT79L71_1 Datasheet, PDF (222/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
REV. 1.0.0
BIT
NUMBER
NAME
7 - 6 Unused
5
Internal Transmit Drive
Monitor
TYPE
R/O
R/W
4
Unused
R/O
3
Unused
R/O
2
TAOS
R/W
1
Unused
R/O
DEFAULT
VALUE
0
0
0
0
0
0
DESCRIPTION
Internal Transmit Drive Monitor Enable:
This READ/WRITE bit-field permits the user to configure the
Transmit Section of XRT79L71 to either internally or exter-
nally monitor the TTIP and TRING output pins for bipolar
pulses, in order to determine whether to declare the Trans-
mit DMO Alarm condition.
If the user configures the Transmit Section to externally
monitor the TTIP and TRING output pins (for bipolar pulses)
then the user must make sure that the user has connected
the MTIP and MRING input pins to their corresponding TTIP
and TRING output pins (via a 274 ohm series resistor).
If the user configures the Transmit Section to internally
monitor the TTIP and TRING output pins (for bipolar pulses)
then the user does NOT need to make sure that the MTIP
and MRING input pins are connected to the TTIP and
TRING output pins (via series resistors). This monitoring
will be performed right at the TTIP and TRING output pads.
0 - Configures the Transmit Drive Monitor to externally mon-
itor the TTIP and TRING output pins for bipolar pulses.
1 - Configures the Transmit Drive Monitor to internally mon-
itor the TTIP and TRING output pins for bipolar pulses.
Transmit "All-Ones" Pattern:
This READ/WRITE bit-field permits the user to command
the Transmit DS3/E3 LIU Block, within the XRT79L71 to
generate and transmit an unframed, "All-Ones" pattern via
the DS3 or E3 line signal (to the remote terminal equip-
ment).
Whenever the user implements this configuration setting
the Transmit DS3/E3 LIU Block will ignore the data that it is
accepting from the Transmit DS3/E3 Framer block (as well
as the upstream system-side terminal equipment) and over-
write this data with the "All-Ones" Pattern.
0 - Configures the Transmit DS3/E3 LIU Block to transmit
the data that it accepts from the Transmit DS3/E3 Framer
block.
1 - Configures the Transmit DS3/E3 Framer block to gener-
ate and transmit the Unframed, "All-Ones" pattern.
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