.


:




:

































 

 

 

 





:

, .

2- (697, 720, 852, 941 ) (1209, 1336, 1477 ).

10 50 50 .

 

ISDN/Int


 

ISDN

2- : , ISDN/

. ISDN B. .

D , .

.

, .

, . , .

 

.

- BRI (basic rate interface) 2 64 / 16 / . .

144 / . , . 48 , 2 4 D.

- PRI (primary rate interface) 30+D 23+D. , . , . : 5+D 11.

 

25

-

- 25 (1974 CCITT) ; 75.

25.

PAD (parket assembler disassembler), . 3- .

.


 

- 25 (S), ( )

- , PAD

- PAD , 25

- PAD 28.

- PAD 3:

1)

2)

3)

4)

5)

- 28

 

Frame Relay

- 25

- 2- ,

-

- ISDN

.

 

ATM

-

-

-ATM (asynchronous transfer mode) B-ISDN (Broad-bandISDN)

- ATM :

1) , , QOS

2) /

3)

4)

5) (Ethernet, ISDN, IP).

- ATM 2-

- ; , .

-

- ISDN, .

 

: 30 /, ISDN , ATM (B-ISDN)

 

- ATM ATM-forum IEEE/

- ATM 2015

 

ATM

1. .

2. 20 .164

3. ,

4. UNI (user network interface)

5. SDH/SONET, 155 /, 622 /, 2,5 /.

 

-

- ( )

- ATM 5 :

1) ( )

2)

3)

 

 

 

 

 

- Constant Bit Rate
: ,
- Variable Bit Rate
: ,
- Variable Bit Rate
: 25, frame relay
D - Variable Bit Rate
: IP Ethernet
X

 

ATM

- Peak Cell Rate (PCR)

- Sustained cell rate - ---------

- minimum cell rate ----------

- maximum cell rate

- cell loss ratio

- cell transfer delay

- cell delay varietion .

 





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