Digital Communications Multiple Choice Questions on “ISDN and interface”.
1. ISDN integrates speech and data on
A. Different lines
B. Same lines
C. Different & Same lines
D. None of the mentioned
Answer: B
Clarification: Integrated services for digital domain integrates speech and data signals on the same lines.
2. ISDN is a
A. Packet switched network
B. Circuit switched telephone network
C. Packet switched & Circuit switched telephone network
D. None of the mentioned
Answer: C
Clarification: ISDN is a circuit switched telephone network which also provides access to packet switched network.
3. Circuit switched connection is provided for
A. Voice
B. Data
C. Voice & Data
D. None of the mentioned
Answer: C
Clarification: Circuit switched connection can be provided for either voice or data.
4. Packet switched connection is provided for
A. Voice
B. Data
C. Voice & Data
D. None of the mentioned
Answer: B
Clarification: Packet switched connection can be provided only for data.
5. Channel bonding provides
A. Higher data rate
B. Lower data rate
C. Does not affect data rate
D. None of the mentioned
Answer: A
Clarification: Channel bonding can achieve higher data rate.
6. U-interface is the two wire interface between
A. Computing device and terminal adapter
B. Terminal adapter and exchange unit
C. Exchange unit and network terminating unit
D. Computing device and exchange unit
Answer: C
Clarification: U-interface is the two wire connection or interface between exchange unit and network terminating unit.
7. T interface is the serial interface between
A. Computing device and terminal adapter
B. Terminal adapter and exchange unit
C. Exchange unit and network terminating unit
D. Computing device and exchange unit
Answer: A
Clarification: T interface is the serial interface between computing device and terminal adapter.
8. S-interface is a _______ bus.
A. Two wire bus
B. Four wire bus
C. Single wired bus
D. None of the mentioned
Answer: B
Clarification: The S interface is a four wire bus that ISDN consumer devices plug into.
9. The services provided by ISDN
A. Bearer service
B. Teleservice
C. Secondary service
D. All of the mentioned
Answer: D
Clarification: The services provided by ISDN and classified by attributes are bearer service, teleservice and secondary service.
10. Attributes of ISDN have
A. Definition
B. Allowable values
C. Definition & Allowable values
D. None of the mentioned
Answer: C
Clarification: ISDN services are characterized by attributes and attributes have definition and allowable values.