XRT79L71_1 Datasheet, PDF (169/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

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XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
BIT NUMBER
NAME
4-3
TxNSrcSel[1:0]
2
TxAIS Enable
1
TxLOS Enable
TYPE
R/W
DESCRIPTION
Transmit N Bit Source Select[1:0]:
These two READ/WRITE bit-fields permit the user to specify the
source or type of data that is being carried via the N bits, within
each Outbound E3 data stream, as indicated below.
TxNSrcSel[1:0]
Resulting Source of A Bit
0
0
The "TxN" bit-field, within the "Transmit E3
Service Bit" register (Address = 0x1135).
0
1 Not Valid - Do not use
The Transmit LAPD Controller block In this
1
0 case, the N bit, will function as the LAPD/
PMDL channel.
The "N" bit is sourced via the "Transmit
1
1 Payload Data Input Interface" block.This is
discussed in greater detail in Section _.
R/W Transmit AIS Indicator:
This READ/WRITE bit-field permits the user to (by software con-
trol) force the Transmit E3 Framer block to generate and trans-
mit the AIS indicator to the remote terminal equipment.
0 - Does not configure the Transmit E3 Framer block to generate
and transmit the AIS indicator. In this case, the Transmit E3
Framer block will transmit normal E3 traffic.
1 - Configures the Transmit E3 Framer block to generate and
transmit the AIS indicator. In this case, the Transmit E3 Framer
block will force all bits (within the Outbound E3 data stream) to
an Unframed "All-Ones" pattern.
NOTE: This bit-field is ignored if the Transmit E3 Framer block
has been configured to transmit the LOS pattern.
R/W Transmit LOS (Pattern) Enable:
This READ/WRITE bit-field permits the user to (by software con-
trol) force the Transmit E3 Framer block to transmit the LOS
(Loss of Signal) pattern to the remote terminal equipment, as
described below.
0 - Does not configure the Transmit E3 Framer block to generate
and transmit the LOS pattern. In this case, the Transmit E3
Framer block will be transmitting normal E3 traffic.
1 - Configures the Transmit E3 Framer block to generate and
transmit the LOS pattern. In this case, the Transmit E3 Framer
block will force all bits (within the Outbound E3 data stream) to
an "All Zeros" pattern.
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