WBBSE Madhyamik Telecom (Vocational) study plan

Define communication and state the three essential elements (transmitter, channel, receiver) plus noise, giving one everyday Indian telecom example of each.

Classify signal modes as simplex, half-duplex and full-duplex, and sketch one real example of each (e.g. TV broadcast, walkie-talkie, telephone call).

Convert between frequency, wavelength and time period for five given values (e.g. 900 MHz, 2.4 GHz, 1,550 nm) showing full working.

Label the parts of a telephone instrument (microphone, earpiece, hook switch, dial pad, ringer, hybrid) and state the function of each in one line.

Distinguish baseband from broadband transmission and list the bandwidth units Hz, kHz, MHz and GHz with one telecom use for each range.

Compare circuit, message and packet switching, giving one advantage, one disadvantage and one suitable service (voice, telegraph-style data, internet data) for each.

Trace a local call from the subscriber loop through the line circuit, switching matrix and trunk to the destination exchange, naming every stage in order.

Explain PCM as sample → quantise → encode, then calculate the 8 kHz sampling rate for a 4 kHz voice channel and the resulting 64 kbps bit rate at 8 bits per sample.

Classify transmission media as guided (twisted pair, coaxial, optical fibre) or unguided (radio, microwave), listing typical bandwidth and one deployment use for each.

Explain FDM, TDM and WDM with one worked example each of how multiple channels share a single medium.

Draw and label the core, cladding, buffer and outer jacket of an optical fibre, and explain total internal reflection with a ray diagram at the core–cladding boundary.

Distinguish step-index from graded-index fibre and single-mode from multimode fibre, stating typical core diameter and one application for each.

List two optical sources (LED, laser diode) and two detectors (PIN, APD), and give one selection criterion for choosing between them.

Identify four causes of optical loss (absorption, Rayleigh scattering, bending, connector/splice loss) and explain why loss is measured in dB and power in dBm.

Compute a simple link power budget: transmitter output minus fibre, splice and connector losses must stay above receiver sensitivity.

Explain the cellular concept - cell, cluster, frequency reuse, handoff and roaming - and sketch a 7-cell reuse pattern with channel groups marked.

Compare 1G to 5G in a table covering approximate launch decade, access technology, typical peak data rate and one representative service.

Draw the GSM architecture (MS = SIM + ME, BTS, BSC, MSC, HLR, VLR) and state the function of each block without notes.

Differentiate FDMA, TDMA, CDMA and OFDMA by how they divide the resource, and give one trade-off of each.

Explain path loss, fading and co-channel interference in radio propagation, and name three mitigation techniques such as antenna diversity, power control and sectorisation.

Map the seven OSI layers to the four-layer TCP/IP model and place HTTP, TCP, IP and Ethernet at their correct layer.

Convert three given IPv4 addresses to binary, identify the address class, and explain in three lines why NAT is used in home broadband.

Compare ADSL, cable, FTTH and 4G/5G fixed wireless on medium, typical download speed and one practical limitation each.

Trace a web page request end-to-end through DNS lookup, home router with NAT, ISP network and HTTP server, drawing it as a labelled flow diagram.

Apply a complaint-handling flow (receive, log, diagnose, escalate, resolve, close, follow-up) to two written customer scenarios and calculate MTTR and ARPU from supplied figures.

Identify at least twelve items in a telecom technician's toolkit (crimping tool, punch-down tool, OTDR, optical power meter, fusion splicer, multimeter, earth tester, cable stripper) and state each one's use.

Terminate an RJ-45 plug on Cat 5e/6 cable using T568B colour sequence and verify continuity/pin-out with a LAN tester or a paper pin-out check.

Write a step-by-step fibre connector and splice procedure checklist, including inspection and cleaning of the ferrule before mating.

Diagnose five fault symptoms - no dial tone, slow broadband, fibre link down, dead battery bank, earthing fault - naming the likely cause and the first-line test for each.

Draft a preventive maintenance schedule for an exchange or BTS site, separating daily, weekly, monthly and quarterly tasks.

Identify telecom workplace hazards - electrical shock, RF radiation near antennas, work at height, glass fibre splinters, battery acid - and state one control measure for each.

Describe correct use of PPE (helmet, full-body harness, insulating gloves, goggles) and the safe procedure for ladder and mast work.

Explain the purpose of equipment earthing and surge protection, and describe first aid for electric shock and for a fibre splinter in the eye or skin.

State the accident reporting chain and explain what a material safety data sheet (MSDS) tells a technician handling battery electrolyte.

Draft a one-page CV and deliver a 60-second self-introduction for a telecom technician role, naming three customer-facing soft skills with a workplace example each.

Complete two full-length timed mock papers of 90 minutes covering all eight domains and re-work every wrong answer to the correct reasoning.

Redraw from memory the three highest-yield diagrams: communication system block diagram, GSM architecture, and fibre cross-section with total internal reflection.

Recall key figures on demand: 8 kHz sampling and 64 kbps PCM, 7-cell reuse, 32-bit IPv4 versus 128-bit IPv6, T568B pin order, and dB versus dBm.

Compress the whole syllabus into a one-page formula and terminology sheet that you can revise in ten minutes.

Role-play one customer complaint call and answer a five-minute viva on site safety, scoring yourself on clarity and correctness.