n ISDN BRI ( )
B 64 /
D - 16 /.
n ISDN PRI ( ) -
30 B 64 /
D - 32 /.
ISDN
ISDN-
1
:
2
LAPD- Link Access Procedure, D channel ( , D-).
:
3
3 :
SETUP -( ), , , ).
Call proceeding -( ) , .
Alert -( ) .
Connect -() ( " ").
Connect acknowledge -( ).
Disconnect -( ). Release () Release complete ( ).
3
, ISDN
:
n ;
n ;
n ;
:
n
n ;
n (7 );
n ;
n ( On-Line );
n .
(B-ISDN)
B-ISDN Broadband Integrated Services Digital Network
B-ISDN
| A | B | C | D | |
| CBR | VBR (RT,NRT) | ABR | UBR | |
| TCP/IP, , |
(ATM)
ATM -Asynchronous Transfer Mode
ATM
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |||
| 5 | (GFC) | (VPI) | 1 | |||||||
| () | (VCI) | 2 | ||||||||
| () | 3 | |||||||||
| () | (PTI) | 4 | ||||||||
| (HEC) | 5 | |||||||||
| 6 | ||||||||||
| ... | ||||||||||
| 53 |
|
|
|
