Bt8370/8375/8376
3.8 Receiver Registers
Fully Integrated T1/E1 Framer and Line Interface
Table 3-13. Receive Yellow Alarm Set/Clear Criteria
Mode
Set/Clear Criteria
Y0
Set for 4 frames (500 µs) if 2 consecutive NFAS frames each contain TS0 bit 3 = 1. Cleared for 4 frames if 2
consecutive NFAS frames each contain TS0 bit 3 = 0.
Y0_INT
Y16
Set for 16 multiframes (32 ms) if every NFAS frame contains TS0 bit 3 = 1. Cleared for 16 multiframes if 1 or
more NFAS frame contains TS0 bit 3 = 0.
Set for 2 multiframes (4 ms) if frame 0 in 2 consecutive multiframes each contain TS16 bit 6 = 1. Cleared for
2 multiframe if frame 0 in 2 consecutive multiframes each contain TS16 bit 6 = 0.
Y16_INT
YB2
Set for 16 multiframes (32 ms) if every frame 0 contains TS16 bit 6 = 1. Cleared for 16 multiframes if 1 or
more frame 0 contains TS16 bit 6 = 0.
Set for 1 frame (125 µs) if all 24 time slots contain bit 2 = 0. Cleared for 1 frame if 1 or more time slots
contain bit 2 = 1.
YB2_INT
YJ
Set for 192 frames (24 ms) if fewer than 15 time slots contain bit 2 = 1. Cleared for 192 frames if 15 or more
time slots contain bit 2 = 1.
Set for 1 multiframe (1.5 ms) if frame 12 contains Fs bit = 1. Cleared for 1 multiframe if frame 12 contains
Fs bit = 0.
YJ_INT
Set for 16 multiframes (24 ms) if each frame 12 contains Fs bit = 1. Set for 16 multiframes (24 ms) if 1 or
more frame 12 contains Fs bit = 0.
Y24
Set for 1 frame (125 µs) if TS24 contains bit 6 = 0. Cleared for 1 frame if TS24 contains bit 6 = 1.
Y24_INT
YF
Set for 192 frames (24 ms) if each TS24 bit 6 = 0. Cleared for 192 frames if 1 or more TS24 bit 6 = 1.
Set for 32 frames (4 ms) if 16 FDL bits contain Yellow Alarm priority codeword pattern (00FFh). Cleared for
32 frames if 16 FDL bits do not contain a Yellow Alarm priority codeword pattern.
YF_INT
Set upon reception of 16 FDL bits matching Yellow Alarm priority codeword and remains set as long as the
codeword pattern is not interrupted for greater than 100 ms. Cleared when the Yellow Alarm priority
codeword is not present for more than 100 ms (26 missing codewords = 104 ms).
3-54
Conexant
N8370DSE
CONEXANT [ CONEXANT SYSTEMS, INC ]
