AIS "1" (RAI - AIS ), AIS: (BER), (CRC), (LOF), (LOM), 2048 /, 16.
ISDN : (LOS), / (LFA), (LOP). AIS , ( ).
4- , A1S. - (SSM) SDII, S1 (. .9) PDII SDII.
- CAS
, 16- - , CAS,
4 : , , , d (. ), , 16 F0 MFAS (0000) sAss, s , - , 16-- - 1-15 abcd- 1 16, 2 17,..., 14 29, 15 30 , 1-15 - 1-15, 16-30 - - 17-1.
| F0,T16 | F1,T16 | F2,T16 | ----- | F15,T16 | |||
| 0000sAss | abcd | abcd | abcd | abcd | ----- | abcd | abcd |
| 1 | 16 | 2 | 17 | ----- | 15 | 30 |
CCS
CCS 16- - 8-64 /, .
PDH
PD. . , .
, 2: ( -) - G.742 ( -) - G.704, ( -) G.751, 4.
PDH
2 G.742 -
2 (8448 /) ( ) 1 .8-4. -, - ( 1), . 848 ( 4×256=1024 , , , 1).
|
|
|
2 ( 4×212 .8-4) 4 -, , 212 , . 1, 2 ( ) .
8-4.
| 2 | ||||||||||||||||||||||||
| ... | ... | |||||||||||||||||||||||
| RAI | S-bit | 1 | 2 | 4 | 1 | 2 | 4 | 4 | ||||||||||||||||
| JC1 | JC2 | JC3 | JC4 | 1 | 2 | 4 | 1 | 2 | 4 | 1 | 2 | 4 | 1 | 2 | 4 | 4 | ||||||||
| JCI | JC2 | JC3 | JC4 | 1 | 2 | 4 | TI | 2 | 4 | 1 | 2 | 4 | 1 | 2 | 4 | 4 | ||||||||
| JCI | JC2 | JC3 | JC4 | JB1 | JB2 | JB3 | JB4 | TI | 2 | 4 | 1 | 2 | 4 | 1 | 2 | 4 | 4 |
(1111010000
- 10 ), AIS (RAI - 11- ) (S-).
2-4- , : JC1, JC2, JC3, JC4, 4 .
848 () (1/848)×8448=9,962 /.
( JBi- 4) 4- 1-2--4, (-) 1, 2, , 4.
PDH, , G.745.
