̳ - BSC. , , , , , .
²ز ֲ ʲ ֲ:
- ;
- ;
- ;
- ;
- ;
- ;
- ;
- ;
- 璺 MSC;
- 璺 .
. 6.25. MSC , GSM (BSC ). -bis. 璺 璺 . . .25 璺 GSM.
ᒺ BSC MSC. , MSC (. , ) .
, , MSC, .
dz GSM ( ) - 璺 (. 6.23).
6.5 GSM 900 DCS 1800.
GSM 900 | DCS 1800 | |
320 (55 ) | 20 (43 ) | |
160 (52 ) | 10 (40 ) | |
80 (49 ) | 5 (37 ) | |
40 (46 ) | 2,5 (34 ) | |
20 (43 ) | --- | |
10 (40 ) | --- | |
5 (37 ) | --- | |
2,5 (34 ) | --- |
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|
6.6 .
GSM 900 | DCS 1800 | |
1 | 0,25 (24 ) | 1,6 (32 ) |
2 | 0,08 (19 ) | 0,5 (27 ) |
3 | 0,03 (14 ) | 0,16 (22 ) |
. 6.23 璺, BTS 璺 BSC . . 6.26 . 璺 n 璺 . , 璺 . 璺 -bis GSM.
.6.25 - BSC
GSM 13 / full-rate 7 / half-rate. full-rate, , GSM. GSM , ( full-rate) 13 /. GSM, , , 13 /. , , GSM, 64 /. , GSM, , .
, GSM, , , MSC , , GSM . ֳ TRAU (. Transcoder Rate Adapter Unit). TRAU 䳺 , MSC, .
TRAU MSC : MSC. 16 /, GSM, GSM 16 / 64 /.
GSM, , BTS. , BSC MSC . TRAU MSC (. 9.27), . , , , , , . , TRAU BSC (. 6.27) BTS (. 6.27).
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|
GSM 64 /, TRAU , . MSC (. 6.27).
6.26 璺
6.27 -
璺, GSM, 13 /, . GSM , , GSM .