XRT83L314 Datasheet, PDF (33/84 Pages) Exar Corporation – 14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT

XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
3.5.1 ATAOS (Automatic Transmit All Ones)
If ATAOS is selected by programming the appropriate global register, an AMI all ones signal will be transmitted
for each channel that experiences an RLOS condition. If RLOS does not occur, the ATAOS will remain inactive
until an RLOS on a given channel occurs. A simplified block diagram of the ATAOS function is shown in
Figure 23.
FIGURE 23. SIMPLIFIED BLOCK DIAGRAM OF THE ATAOS FUNCTION
TAOS
TTIP
Tx
TRING
ATAOS
RLOS
3.5.2 Network Loop Up Code
By setting the LIU to generate a NLUC, the transmitters will send out a repeating "00001" pattern. The output
waveform is shown in Figure 24.
FIGURE 24. NETWORK LOOP UP CODE GENERATION
Network
Loop-Up
Code
1
0
0
0
0
1
0
0
0
0
1
3.5.3 Network Loop Down Code
By setting the LIU to generate a NLDC, the transmitters will send out a repeating "001" pattern. The output
waveform is shown in Figure 25.
FIGURE 25. NETWORK LOOP DOWN CODE GENERATION
Network
Loop-Down
Code
10010010010
29