TDC 461 - Basic Communication Systems 10/21/99
Quiz 6
TDC 461 – Voice Data ISDN Study Guide
1) What is the function of a balun connector?
a) A balun is the receptacle into which a modem connects.
b) Baluns are used to convert a coax signal into one which can be transmitted over twisted wire pair.
c) Baluns are used to connect fiber optic fibers.
d) Baluns convert balanced to unbalanced signals and back again.
2) Most data communications would benefit from switching through a PBX.
True / False
3) The cost of a device to connect a terminal to a PBX digital port is usually far less than a low speed modem.
True / False
4) The BRI is:
a) used to connect terminals to switching equipment
b) Binary Routing Information used by SS7 to route calls
c) defined as two 64 kbps channels for voice, data or image and a 16 kbps signaling channel
d) used to connect an ISDN terminal to a PBX or Centrex
e) a and c
f) a, c, and d
g) none of the above
5) It is unlikely that businesses will gain any value from ISDN inbound call management applications since privacy legislation prevents a carrier from sending ANI to a subscriber.
True / False
6) A modem in a modem pool requires both a digital module terminating on a digital port board and an analog port board termination.
True / False
7) The benefits of consolidating all of the local distribution onto twisted wire pairs is / are:
a) to save money on the installation and relocation of coax
b) to simplify the administration by only having to keep records on one distribution system
c) reduction of the space required in conduits by coax
d) to extend the distances available on coax by using baluns
e) all of the above
f) a, b, c
g) a and c
h) none of the above
8) Data sessions are very similar to voice sessions and it is usually a good idea to use the same switching gear, i.e. PBX to handle both voice and data.
True / False
9) The voice and data information generated by a digital telephone are generally carried on separate wires and can be manually separated out at the cross connect.
True / False
10) Modem pools are good because they reduce the number of time slots required to make a data call from a terminal to an outside data source.
True / False
11) Many of the benefits of switching data through a PBX are realized only when PBXs are networked together using digital facilities.
True / False
12) A casual data user who needs to access multiple endpoints is a good candidate for data switching through a PBX.
True / False
13) Switching data through a PBX can allow the sharing of access to network facilities for both voice and data and can result in significant cost savings.
True / False
14) In the CCITT definitions, the "D" channel of the Primary Rate Interface (PRI) and the Basic Rate Interface (BRI) is defined as:
a) the fourth channel in the group
b) the signaling channel
c) the user data channel
d) the diversity (spare) channel
15) In order for an ISDN equipped PBX to receive the main telephone number of the calling party, the call MUST originate from:
a) an ISDN equipped telephone
b) an ISDN equipped PBX or Centrex
c) telephone equipment served by an ISDN Central Office
d) all of the above
e) none of the above
16) With a PBX that uses a PRI and Call By Call Service Selection, the PBX identifies which service should be used to complete a call by:
a) using the channel pre-assigned to the service
b) by transmitting a call set up packet identifying the service
c) either a or b
d) none of the above, Call By Call Service Selection means that the Service Node determines which service to use.
17) What is the UUI field in a Q.931 call set up message used for?
a) The Unique Unqualified Identifier is used to identify a call for billing purposes.
b) There is no UUI field in the Q.931 set up message.
c) The Under Utilized Indicator identifies channels that have carried little traffic and may be out of service.
d) The User to User Information field is transmitted end to end and could be used for name, password or sign on information.
e) none of the above
18) The ’’B’’ channels defined in the BRI (2B+D) and PRI (23B+D) are:
a) backup channels used in the event of a failure of the ‘‘D’’ channel.
b) big channels used for video or high speed data transfer.
c) balun channels used for 3270 terminal connections.
d) bearer channels used for voice, data or image.
e) none of the above
19) The term "clear channel" refers to:
a) a channel with a bit error rate low enough for high speed data transmission.
b) a channel which is free from bit robbing and provides a full 64 kbps for digital transmission
c) a signal which causes the Service Node to clear all channels on a PRI.
d) a signal from a distant Central Office which identifies that a disconnect has occurred.
e) none of the above
20) SS7 stands for Signaling System 7 and is a signaling protocol designed to control call set up, routing, disconnects, network management, billing data and software features in and between networks.
True / False
21) B8ZS is a technique that uses bipolar violations to identify one that have been insertedinto the data stream, to avoid loss of synchronization, and are removed at the receiving end.
True / False
22) The field in a Q.931 call set up message that identifies the calling party main telephone number is called:
a) Automatic Number Identification (ANI)
b) Station Identification (SID)
c) Common Channel Interoffice Signaling (CCIS)
d) Link Access Procedure on the "D" channel (LAPD)
e) none of the above
23) With call by Call Service Selection, the same channels on a PRI (Primary Rate Interface) facility can be used to both place and receive calls.
True / False
24) ISDN stands for Integrated Services Digital Network and defines a limited set of standard interfaces to be used to access a network.
True / False
25) The PRI is:
a) used between a PBX and a Central Office
b) defined as 23B + D
c) used to connect two PBX's together
d) can connect a PBX to a computer or a computer to a computer
e) can connect a Centrex to a PBX or to a network
f) all of the above
g) none of the above
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