XRT75R12D_06 Datasheet, PDF (65/134 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET

XRT75R12D
REV. 1.0.1 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
TABLE 20: APS/REDUNDANCY TRANSMIT CONTROL REGISTER - CR8 (ADDRESS LOCATION = 0X08)
BIT 7
Reserved
BIT 6
Reserved
BIT 5
BIT 4
BIT 3
TxON Ch 11 TxON Ch 10 TxON Ch 9
R/W
R/W
R/W
BIT 2
TxON Ch 8
R/W
BIT 1
TxON Ch 7
R/W
BIT 0
TxON Ch 6
R/W
BIT
NUMBER
NAME
7,6
Reserved
5
TxON Ch 11
4
TxON Ch 10
3
TxON Ch 9
2
TxON Ch 8
1
TxON Ch 7
0
TxON Ch 6
TYPE
R/W
DESCRIPTION
Transmit Section ON - Channel n
This READ/WRITE bit-field is used to turn on or turn off the Transmit Driver associ-
ated with Channel n on a per channel basis. If the user turns on the Transmit Driver,
then Channel n will transmit DS3, E3 or STS-1 pulses on the line via the TTIP_n and
TRING_ n output pins.
Conversely, if the user turns off the Transmit Driver (for channel n), the TTIP_n and
TRING_n output pins will be tri-stated.
0 - Shuts off the Transmit Driver associated with Channel n and tri-states the TTIP_n
and TRING_ n output pins.
1 - Turns on the Transmit Driver associated with Channel n.
NOTE: The master TxON control (pin # P4) must be in a high state (logic 1) for this
operation to turn on any channel.
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