XRT79L71_1 Datasheet, PDF (167/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

REV. 1.0.0
XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
BIT NUMBER
NAME
7
TxAIS - Unframed "All-
Ones"
6
DS3 AIS-Non-Stuck Stuff
5
Unused
4
TxLOS Pattern Select
3-0
Tx_Idle Pattern[3:0]
TYPE
R/W
R/W
R/W
R/W
R/W
DESCRIPTION
Transmit AIS - Unframed "All-Ones":
This READ/WRITE bit-field permits the user to configure the
Transmit DS3 Framer block to transmit either of the following
patterns, anytime it is configured to transmit the AIS indicator.
1. A Framed, repeating "1, 0, 1, 0…" pattern (per Bellcore
GR-499-CORE) or
2. An Unframed "All-Ones" pattern.
0 - Configures the Transmit DS3 Framer block to transmit the
Framed, Repeating "1, 0, 1, 0, …" pattern whenever it is config-
ured to transmit the AIS indicator.
1- Configures the Transmit DS3 Framer block to transmit an
Unframed, "All-Ones" pattern, whenever it is configured to trans-
mit an AIS signal.
DS3 AIS - Non-Stuck Stuff Option - AIS Pattern:
This READ/WRITE bit-field (along with the TxAIS - Unframed
"All-Ones" bit-field) permits the user to define the type of AIS
data-stream that the Transmit DS3 Framer block will transmit, as
described below.
0 - Configures the Transmit DS3 Framer block to force all of the
C bits to "0", when it is configured to transmit a Framed AIS sig-
nal.
1 - Configures the Transmit DS3 Framer block to NOT force all
of the C bits to "0", when it is configured to transmit an Framed
AIS signal. In this case, the C bits can be used to transport
FEAC or PMDL messages.
NOTE: This bit-field is ignored if the Transmit DS3 Framer block
has been configured to transmit an Unframed - "All-
Ones" type of AIS signal.
Transmit LOS Pattern Select:
This READ/WRITE bit-field permits the user to configure the
Transmit DS3 Framer block to transmit either an "All Zeros" or
an "All-Ones" pattern, anytime it is configured to transmit the
LOS Pattern to the remote terminal equipment, as described
below.
0 - Configures the Transmit DS3 Framer block to transmit an "All
Zeros" pattern, whenever it is configured to transmit the LOS
pattern.
1 - Configures the Transmit DS3 Framer block to transmit an
"All-Ones" pattern, whenever it is configured to transmit the LOS
pattern.
Transmit DS3 Idle Signal Pattern:
These READ/WRITE bit-fields permit the user to specify the type
of framed, repetitive four-bit pattern that the Transmit DS3
Framer block should generate and transmit, whenever it is con-
figured to transmit the "DS3 Idle" pattern.
NOTE:
Setting these bit-fields to "[1, 1, 0, 0]" configures the
Transmit DS3 Framer block to transmit the standard
Framed, repeating "1, 1, 0, 0, …" pattern (per Bellcore
GR-499-CORE) requirements.
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