《教學》各寬頻的傳輸速度
各寬頻的傳輸速度
T1 American standard 1544 kbit/s
E1 European standard 2048 kbit/s
T2 American standard 6 Mbit/s (4 x T1, exotic)
E2 European standard 8 Mbit/s (4 x E1, exotic)
E3 European standard 34 Mbit/s (4 x E2)
T3 American standard 45 Mbit/s (7 x T2, very common)
OC-1 American standard 51 Mbit/s (SONET, 1 T3)
E4 European standard 140 Mbit/s (4 x E3)
OC-3 American standard 155 Mbit/s (SONET, 3 x OC-1)
STM-1 European standard 155 Mbit/s (SDH speed = OC-3)
STM-4 European standard 622 Mbit/s (4 x STM-1)
STM-16 European standard 2488 Mbit/s (16 x STM-1; 2,5 Gbit/s)
STM-64 European standard 9952 Mbit/s (16 x STM-1; 10 Gbit/s)
Japanese know T1 but multiplex in a different hiërarchy to 32 Mbit/s and 96 Mbit/s. Officially there are no Amerikan standards above T3, in common-practice there where a lot of proprietary transmissionystems build in the eighties which could do up to 1,8 Gbit/s.
In Europe there have been quite some 565 Mbit/s (4 x E4) lines.
SONET/SDH started in the middle eighties to stop the wildgrowth and to define higher speeds as a World Standard. This only worked for speeds of 155 Mbit/s and higher, mainly with, and because of, the optic interfaces, which are identical.
The Amerikan SONET-standard follows the same hiërarchy as SDH;
OC-12 = 622 Mbit/s, OC-48 = 2,5 Gbit/s, OC-192 = 10 Gbit/s
For the near future:
STM-256 and/or OC-768 40 Gbit/s (2001 of 2002)
Optic: DWDM wavelenghtmultiplex
delivered in channels, per channel 2,5 Gbit/s or 10 Gbit/s
16 channel 40 Gbit/s (official standard ITU)
32 channel 80 Gbit/s (Lucent Wavestar 80G)
40 channel 100 Gbit/s (Ciena)
96 channel 240 Gbit/s (Ciena)
and
16 channel 160 Gbit/s
40 channel 400 Gbit/s (Lucent Wavestar 400G,
prototypes available)
128 channel 1,28 Tbit/s (Pirelli-TeraMux)
160 channel 1,6 Tbit/s (OPTera/Nortel)
這是我整理出來的一些些資料,希望對於各位能有所幫助
如有不足處請各未能加以補充3Q~~~
