ISDN , . , , , , --. , ISDN . .. , ITU-T I.210, :
(bearer services) - , (1-2-3) ;
(teleservices) - - , , , , --.
:
, (BLLF) (BHLF);
, (ALLF) (AHLF).
:
- /, - speech; : S, S/T; : , ;
- (3,1 ), - 3.1 audio - ;
- , - unrestricted digital (URD), S, S/T; , - packet, S, ST.
:
- 3, - 3,1 audio - ;
- ISDN 3,1 , - speech - 2-;
- ISDN 7,0 , - (URD) - G.722 2- ( =7 , 64 /);
- 4, - URD - 300-400 /;
- 64 /, - URD - - ;
- , - URD - 64 /;
- , - video - () (80% ) (G.722 - 20% ) 2B+D.
, .7-3.
7-3.
| (/) | |||||||||||
| 2x64 | (ffs) | (ffs) | |||||||||
| URD | URD | Speech | 3,1 audio | 3,1-7 audio | 7-15 audio | (ffs) | |||||
| 8 | SDU | TSSI | RDTD | ||||||||
| (1.140) | |||||||||||
| / | - | ||||||||||
| D(16) | D(64) | 0 | 11 | 12 | (ffs) | ||||||
| 9.1 | 1 | I.430 1.431 | I.461 | I.462 | I.463 I.465 | I.465 (V.120) | (ffs) | ||||
| 9.2 | 2 | I.440; I.441 | I.462 | .25 | (ffs) | ||||||
| 9.3 | 3 | I.450; I.451 | I.461 | I.462 | .25 | I.463 | (ffs) | ||||
| 9.4 | 1 | I.430 I.431 | I.460 | I.461 | I.462 | I.463 | I.465 (V.120) | G.711 | G.722 | (ffs) | |
| 9.5 | 2 | HDLC LAPB | I.440; I.441 | .25 | I.462 | (ffs) | |||||
| 9.6 | 3 | .70-3 | .25 | I.462 | (ffs) | ||||||
| (ffs) | |||||||||||
: ffs - ; TSSI - Time slot sequence integrity - -; RDTD - Restricted differential time delay -
|
|
|
, , :
- ;
- ;
- ;
- .
. ITU-T Q: Q.730-Q.737:
Q.730 - ;
Q.731.1 - (DD);
Q.731.2 - (MSN);
Q.731.3 - ;
Q.731.4 - ;
Q.731.5 - ;
Q.731.6 - ;
Q.731.7 - ;
Q.731.8 - (SUB);
Q.732.2-7 - (CFB);
Q.733.1 - (CW);
Q.733.2 - ;
Q.733.3 - ;
Q.733.4 - ();
Q.734.1 - - ;
Q.734.2 - -;
Q.735.1 - (CUG);
Q.737.1 - -.
, :
- () ;
CFB - , ( ) ;
CFNR - ( ) - ;
CFU - ( ), ;
|
|
|
CUG - , ( ) ;
CW - - , , - , (QSIG );
DD - ISDN - ;
MSN - - - - 8 - , , , 2 ;
- () (2 );
SUB - , .. , , .
