XRT86L30
REV. 1.0.1
SINGLE T1/E1/J1 FRAMER/LIU COMBO
ATAOS (Automatic Transmit All Ones)
8.1.2
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 49.
F
IGURE 49. SIMPLIFIED
B
LOCK
D
IAGRAM OF THE ATAOS FUNCTION
TTIP
Tx
TRING
TAOS
ATAOS
RLOS
8.1.3
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 50.
F
IGURE 50. NETWORK
L
OOP
U
P
C
ODE GENERATION
1
0
1
0
0
0
0
0
0
0
1
Network
Loop-Up
Code
8.1.4
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 51.
F
IGURE 51. NETWORK
L
OOP
D
OWN
CODE GENERATION
0
1
0
1
0
0
1
0
0
1
0
Network
Loop-Down
Code
184
EXAR [ EXAR CORPORATION ]
