单选题CCITT于（）年接受了SONET概念，并重新命名为SDH。A1985B1970C1988D1990
单选题
CCITT于（）年接受了SONET概念，并重新命名为SDH。
A
1985
B
1970
C
1988
D
1990
参考解析
解析：
暂无解析
相关考题：
On an ONS 15454 node you can tunnel a（n） （）.A、 SDH circuit over a SONET network delivering it as an SDH signalB、 SDH circuit over a SONET network delivering it as a SONET signalC、 SONET circuit over an SDH network delivering it as an SDH signalD、 SONET circuit over an SDH network delivering it as a SONET signal
Which two statements are true about optical networks?（）A、SONET and SDH both use time-division multiplexing.B、An optical transport network system uses time-division multiplexing.C、SONET and SDH both use wavelength-division multiplexing.D、An optical transport network system uses wavelength-division multiplexing.
POS（PacketOverSONET/SDH，SONET/SDH上的分组）将长度固定的数据包直接映射进SONET同步载荷中，使用SONET物理层传输标准，提供了一种高速、可靠、点到点的数据连接。
Which of these technologies is characterized as being a multipoint Layer 2 VPN that connects twoor more customer devices using Ethernet bridging techniques？（）A、 DPTB、 MPLSC、 VPLSD、 CWDME、 DWDMF、 SONET/SDH
On an ONS 15454 node you can tunnel an （）.A、SDH circuit over a SONET network delivering it as an SDH signalB、SDH circuit over a SONET network delivering it as a SONET signalC、SONET circuit over an SDH network delivering it as an SDH signalD、SONET circuit over an SDH network delivering it as a SONET signal
单选题On an ONS 15454 node you can tunnel a（n） （）.A SDH circuit over a SONET network delivering it as an SDH signalB SDH circuit over a SONET network delivering it as a SONET signalC SONET circuit over an SDH network delivering it as an SDH signalD SONET circuit over an SDH network delivering it as a SONET signal
单选题On an ONS 15454 node you can tunnel an （）.ASDH circuit over a SONET network delivering it as an SDH signalBSDH circuit over a SONET network delivering it as a SONET signalCSONET circuit over an SDH network delivering it as an SDH signalDSONET circuit over an SDH network delivering it as a SONET signal
单选题What protocol enables Ethernet over SONET/SDH encapsulation interoperability between the G-series and ML-series Ethernet cards？（）A LEXB HDLCC GFP-FD PPP/BCP
单选题Which of these technologies is characterized as being a multipoint Layer 2 VPN that connects twoor more customer devices using Ethernet bridging techniques？（）A DPTB MPLSC VPLSD CWDME DWDMF SONET/SDH