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单选题
公众电话交换网（PSTN，PuBlic SwitcheD Telephone Network）是承载话音业务的基础网络，其采用的技术是（）。
A
话音交换技术
B
数据交换技术
C
集中交换技术
D
电路交换技术
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Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）A、the FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central officeB、the FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial toneC、the FXS interface connect directly to an IP phone and supplies ring， voltage， and dial toneD、the FXS interface connect directly to ISDN voice channels
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公众电话交换网（PSTN，PuBlic SwitcheD Telephone Network）是承载话音业务的基础网络，其采用的技术是（）。A、话音交换技术B、数据交换技术C、集中交换技术D、电路交换技术
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Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）A、The FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office.B、The FXS interface connects directly to a standard telephone，fax machine，or similar device and supplies ring，voltage，and dial tone.C、The FXS interface connects directly to an IP phone and supplies ring，voltage，and dial tone.D、The FXS interface connects directly to ISDN voice channels.
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单选题Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.A
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考题
单选题An alternative to plain old telephone service (POTS) would be:（）A
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单选题Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）A
the FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central officeB
the FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial toneC
the FXS interface connect directly to an IP phone and supplies ring， voltage， and dial toneD
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考题
单选题Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）A
The FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office.B
The FXS interface connects directly to a standard telephone，fax machine，or similar device and supplies ring，voltage，and dial tone.C
The FXS interface connects directly to an IP phone and supplies ring，voltage，and dial tone.D
The FXS interface connects directly to ISDN voice channels.
考题
填空题PSTN的中文全程是（）最早的主要是提供电话业务。英文全程是Public Switch Telephone Network。
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