) :
- : , , ;
- : , ;
- : , , .
-------------------------------------------
5ESS- (), 64 / 1 1 (+ (), SSI7, ISDN, (.25/.75), (1983).
DSS1 - 1 - , ISDN (ITU-T 0.933).
ISDN PRM - ISDN.
ISDN Multirate - ISDN .
ISDN-SN - .
ISDN-UP - .
- () - ( 100%- ) , " , 0 - ; , : - , , , .
SIF - .
UDI - URD ; ( ISDN, Q.931).
UDI-TA - / ( ISDN, Q.931).
-----------------------------------
1. 2 ISDN , ?
2. ISDN?
3. : 23B+D 30B+D?
4. D- ISDN D- B-ISDN?
5. PRI -ISDN PRI ISDN?
6. ?
7. BRI PRI?
8. BRA PRA?
9. OSI ISDN?
10. ISDN ?
11. ISDN?
12. ISDN D-?
8
PDH
, , , , , . . , , : , , , ? 1, , .. , : PDH, SDH WDM.
|
|
|
. :
- (, - wireless), ;
- (wire, () , UTP/STP) - / , , ;
- (cable, ), ;
- (waveguide, ), , , ;
- (fiber optic, ), ( ) .
- f. , , - fcp. fcp, .
, fcp / C = 2nfcp.
( ) , , , R /, /, .. ≥ R.
( ) , , , , D=S/N, : C=W log2 (1+D), W - .
/ ( ) , , .
