C-DOT DSS MAX

I. Fill in the blanks:

1) The destination of Signalling Cables is given in P/Q/R/S/T format. Here, P denotes ……………………………………

2) The MDF Cables used for connecting Subscriber lines consists of 64 pairs divided into …………… bunches of ………………… pairs each.

3) To carry out Exchange Side (Signalling + CODEC) tests of a Subscriber Line, Test Set No: ………………… is used.

4) When one copy of BMS goes faulty in a Base Module, the class of alarm generated is …………………………………

5) The Subscriber priority assigned by the system for CCB-STD line is …………

6) A Trunk Group may be identified by a number between …………… & ………………

7) A trunk circuit is identified by the ………………… designating the port at which the circuit is connected to the Exchange hardware.

8) TGP-CAT may be a number between ……………… and ……………………

9) Not more than ……………… TENs can be added to a TGP by a single command.

10) In a TU, time slot ……………………… is used as HDLC message link with BPU.

11) The Announcement Card (ANNC) provides …………… different stored announcements.

12) TTC is located in Slot No: …………… in TU ……………… in the SBM switch.

13) The 128 terminals in a TU are scanned by the SPC during a period of ……… ms.

14) SCIC card in TSU is similar to TIC card hardware and software-wise.

15) IOP is used as the …………………………………… in C-DOT DSS.

16) IOM consists of two similar switch units, namely, ……………… and …………………

17) Operating System used in IOP is ……………………

18) The Link speed of IOP-BP/AP link is …………………… and that of IOP-IOP link is ………………………

19) The BPU hardware when used in AM is called …………………………… and when used in CM is called …………………………………

20) In SBM configuration, BPU is connected to ………………… , …………………… and ………………………………… through HDLC links.

21) ……………………………… is the message transfer point in Base Module.

22) BP communicates with other processors like TIC, SCIC, TSC, TGA, ANNC, MFC through ……………………………………

23) BMS is housed in ………………………………… frame.

24) In MBM configuration, BPU is connected only to ………………………………………

25) In MBM configuration, IOP and ADP are connected to ………………………………

26) In C-DOT DSS MAX, ……………………… is the basic growth unit.

27) The LCC interfaces up to ……………… subscribers.

28) A Terminal Group (TG) consists of ……………… Terminal Cards.

29) In a TU, there can be a maximum of ……………… Terminal Groups (TG).

30) TIC is an ………-bit microprocessor Controller Card.

31) The two types of analog trunk cards are ……………………… & ……………………………

32) TSU receives …………………… channels from each TU.

33) In APU, ………………… Central Message Switches (CMS) are housed.

34) The I/P supply to PSU-II is …………………… and it generates secondary voltages like ……………… , …………………… , …………………… & ……………………

35) If BMS-0 goes faulty in the Base Module, a ………………… Alarm is generated.









II. Choose the correct answer from the brackets:

1) ………………… is the heart of the SBM. (ANNC/ TIC/ BP)

2) There are ………………… Test Access relays in an LCC. (2/ 4/ 8)

3) A maximum of ……………… Terminal Cards can be provided in a TU. (8/ 16/ 24)

4) The signaling information from the terminations are processed by …………… card. (TIC/ TUI/SPC)

5) A TIC controls ………………… Terminal Groups. (2/ 4/ 8)

6) A maximum of ………………… Digital Trunk Systems can be provided in a DTU. (4/ 8/ 16)

7) A maximum of ………… MFC cards can be provided in C-DOT SBM RAX. (4/ 3/ 8)

8) All the tones required for the Exchange are generated by ………………… card. (ANNC/ MFC/ TGA)

9) …………………………… acts as a Message Transfer Point between BP and different controllers. (BP/ BMS/ MU)

10) The Master Controller in the SBM is ………………… (BPU/ TSU/ TIC)

11) The maximum concentration permissible in C-DOT MAX is …………………………… (3:1/ 4:1/ 8:1)

12) The OOD terminal is connected to the ……………… (BP/ TS/ IOP)

13) When one of the IOPs goes out of service, …………………… alarm is reported. (Non-urgent/ Urgent/ Critical)

14) When ANNC goes out of service, …………………… alarm is reported. (Non-urgent/ Urgent/ Critical)

15) When any PSU card failure happens, ………………………… alarm is reported. (Non-urgent/ Urgent/ Critical)

16) When Battery-Low condition is encountered, …………………… alarm is reported. (Non-urgent/ Urgent/ Critical)

17) To find out the status of all Switch Units (SWU) in the system, ……………………… command is used.

18) In BPU and TSU, the PSUs used are of type …………………… (I/ II/ III)

19) From each LCC slot, ……………………… pairs of wires are to be extended to MDF. (8/ 16/ 24)

20) In the TEN 1-1-1-3-6, the card slot number is …………… (1/ 3/ 6)

21) In SBM configuration, IOP and ADP are directly connected to …………………………… (TU/ TSU/ BPU)

22) In the normal working of BPU, …………………………… is active.
(MU-0, MU-1/ MU-0 & MU-1)




III. Say ‘TRUE’ or ‘FALSE’; if ‘FALSE’, correct the underlined portion:

1) It is possible to login to ‘root’ account from any terminal connected to the IOP.

2) The individual cards in each IOP are duplicated.



IV. Answer the following questions:

1) List the major functions performed by IOP.

2) Mention the different RUN LEVELS of IOP.

3) Name the software deliverables required for Software installation in IOP.

4) The three racks of a C-DOT SBM RAX are shown below. Complete the diagram showing the different TUs and concentration. Also note down the ti identities.










5) Write down the Card Slot No. of the following PCBs:

a) ANNC: b) TTC:

c) TGA-0: d) TGA-1:

e) MFC1: f) MFC2:

g) MFC3: h) MFC4:

i) CPU-0: j) CPU-1:

6) Names of few Switch Units are given below. Indicate the PCBs that constitute them:

a) TI : b) BP :

c) BMS : d) MU :

e) TSC :

7) An alarm message displayed in OOD terminal is shown below.
Now answer the following questions:

i) What is the type of alarm?

ii) Name the Class of this alarm.

iii) Which is the unit affected?

iv) Does this message correspond to a newly reported alarm?
BSNL C-Dot

C-DOT 256P RAX

I. FILL IN THE BLANKS:

1) The C-DOT 256P RAX follows a flexible …………………… digits numbering scheme.

2) In C-DOT 256P RAX, when an Exchange Code is programmed, it can provide ………… local Directory Numbers.

3) The Remote Monitoring Number of a 256P RAX whose Exchange Code is 54874 is ………………………………………

4) There are …………… card frames in 256P RAX. The bottom frame is called as the ………………………………… and the top frame is called as …………………………………………

5) ……………………… Terminal Interface Cards make a Terminal Group.

6) …………………… Card has got provision to generate 16-KHz metering pulse and feed it to Sub’s leads for home metering.

7) Each 4-Wire E&M trunk consists of …………… physical wires.

8) Each two-way trunk consists of …………… physical wires.

9) To extend all E&M trunks of an E&M trunk card to the MDF, …………… pairs of wires are required.

10) 30-Channel Digital Trunk Unit is packages in two cards - …………………………………… and …………………………………………

11) A maximum of ………………… Digital Trunk Units can be provided in C-DOT 256P RAX.

12) RDS and RDC cards can be provided in Slot No. …………… & ……………… of Master Frame and Slave Frame.

13) The Test Access relays are provided in the ……………………… card.

14) The ……………… card has Ringer Generator which generates 75V AC 25 Hz with a cadence of ……………………………………………………………………………………………………………………

15) C-DOT 256P RAX operates from …………… V DC, ……………… Amp source.

16) The two security levels of the RAX are ……………………… & ……………………………………

17) When both copies of RAT cards are healthy and announcement is enabled, the active copy provides ……………………… and the passive copy provides …………………………

18) The command for knowing the Active/Passive copies of Controller Cards is …………………………………………

19) Only the last …………………… circuits of a CCM card are provided with 16-KHz Pulse Generator.

20) ……………………… is a microprocessor-based controller card which handles the call processing functions.

21) ……………………………… is fed to an Alarm Reporting Number when any one of the Controller Cards fail.

22) The I/P supply to the Exchange is fed via an HRC fuse of rating …………… Amps which is provided in the ……………………… Card.

23) Each RMF Card services ……………… channels per card.

24) RAP sends the termination-related information to RSC over ……………………… link.

25) RMF cards are placed in ……………… Frame only and services …….channels per card.

26) The Directory Number ………………………………… is reserved for remote monitoring.

27) Each Terminal Interface card caters to ………………… terminations.

28) ……………… has all the announcements stored in EEPROMs.

29) ………………………… card is the only Service Circuit card which is duplicated.

30) ……………………… is fed to the Alarm Number when any one of the PSU fails.

31) When you dial the Remote Monitoring Number, ………………………… is obtained if Battery Low condition is prevailing in the Exchange.

32) User Password consists of ………………………… alpha-numeric characters.

33) Each E&M trunk consists of …………… physical wires: ……………… wires for speech and ……………… wires for exchange signaling.

34) EMF card interfaces with …………………… card for voice and ………………… card for signaling information.

35) The Service Circuit cards in the 256P RAX are ………………… , ……………………, …………………………… and ……………………………

36) The Service Circuit cards which are termed as fixed elements are ……………… and …………………………

37) There are ……………………… RAX Power Filter cards in the PDP.

38) The LCD in the Maintenance Panel is ………………… character display.



II. Answer the following questions:

1) In a C-DOT 256P RAX, the Exchange Code is programmed as 52682. Then:

a) What is the length of local directory numbers?
b) What is the range of Directory Numbers?
c) What is the Remote Monitoring Number?

2) Name the different types PCBs used in C-DOT 256P RAX.

3) Name the Controller Cards in C-DOT 256P RAX.

4) Name the Service Circuit Cards in C-DOT 256P RAX.

5) Name the Terminal Interface Cards in C-DOT 256P RAX.

6) Name the Analog Trunk Interface cards in C-DOT 256P RAX.

7) Name the Digital Trunk Interface cards in C-DOT 256P RAX and also mention the Slot Nos. in which they are to be provided.

8) Name the different outputs of PSU-I card.

9) Mention the different loads to which the RPM cards provide supply.

10) Name the two security levels of the RAX.

11) What are the uses of the User Password?

12) What are the uses of the Super User Password?

13) Name the Controller cards in the Slave Frame.

14) Mention the Frame and Slot No. in which a Conference (CNF) card is provided.

15) What are the different tones used to represent the various conditions of the system when the Remote Monitoring Number is dialled? Also mention the conditions.

16) What are the precautions to be taken for removing a PSU Card from a Frame?

17) Prepare a Card Configuration Chart of Master Frame of C-DOT 256P RAX.

18) Prepare a Card Configuration Chart of Slave Frame of C-DOT 256P RAX.

19) Complete the following Chart with the names of the Cards:

MASTER FRAME
11 12 13 14 15 16




III. Match the following:

COLUMN ‘A’ COLUMN ‘B’ MATCH
1 RAP 0 &1 A Used for trunk offering 1
2 Getting NUT on dialing ABCDE00 B Service Circuit Cards 2
3 EMF & TWT C Duplicate PSU failure 3
4 CNF D Analog trunk interfaces 4
5 EMF & RTC E Provided only in Master Frame 5
6 Passive RAT Card F Handles all signaling information 6
7 Getting BT on dialing ABCDE00 G 16-KHz Metering pulse generator 7
8 RDS & RDC H Provides announcements 8
9 CCM Card I Digital Trunk Interfaces 9
10 SPC J ‘Battery Low’ condition 10




IV. Match the following:

COLUMN ‘A’ COLUMN ‘B’ MATCH
1 RSC-0 A FR: 01 & 02 SL: 25 1
2 PSU Copy 1 B FR: 01 SL: 14 2
3 RAT-0 C FR: 01 SL: 08 3
4 RAP-1 D FR: 01 & 02 SL: 12 4
5 RSC-1 E FR: 01 SL: 09 5
6 RMF-1 F FR: 01 & 02 SL: 15 6
7 RTC G FR: 01 & 02 SL: 16 7
8 SPC-1 H FR: 01 SL: 10 8


V. Match the following:

COLUMN ‘A’ COLUMN ‘B’ MATCH
1 EDCBA00 A Port Status Display of Fr: 01 1
2 CCM Card B Alarm Reporting Number 2
3 MNT <2> <1> C Remote Monitoring Number 3
4 Any Dir. No. other than EDCBA00 D Master Card Status Display 4
5 MNT <5> <1> E 16-KHz Pulse Generator 5



VI. Match the following:

COLUMN ‘A’ COLUMN ‘B’ MATCH
1 RMF-1 & RMF-2 Cards A Analog Interface Cards 1
2 CCM & LCC Cards B Duplicated Service Circuit Cards 2
3 RAP-0 & RAP-1 Cards C Digital Trunk Interface cards 3
4 RAT-0 & RAT-1 Cards D Provided only in Master Frame 4
5 RDS & RDC Cards E SL: 10 & 17 of Master Frame 5








VII. Say ‘TRUE’ or ‘FALSE’; if ‘FALSE’, correct the underlined portion suitably:

1) When one of the RAT Cards goes faulty, the other RAT card provides only announcements.

2) A maximum of two RMF cards can be provided in the RAX – one in the Master Frame and one in the Slave Frame.

3) The time-out period of Dial Tone is 60 seconds.

4) Only the last four ports of a CCM card slot can be used for connecting CCM subscribers.

5) In the Master Card Status display, if the bottom row LED is glowing ‘GREEN’ against SL: 09, it means that the RAT-0 card is faulty.

6) In C-DOT 256P RAX, the Exchange Code can be of 2 to 5 digits.

7) The Remote Monitoring Number consumes the first physical port.

8) The Super User Password can be used to perform all the system functions relating to its status change.

9) There are four Terminal Groups each in Master Frame & Slave Frame.

10) RSC has 256 x 256 Non-blocking 4-wire PCM Switch.

BSNL C Dot