JTO Exam Quick Notes
Formula Sheet
Communication
•AM bandwidth: BW = 2 × fm
•FM bandwidth (Carson's rule): BW = 2(Δf + fm)
•Shannon capacity: C = B log₂(1 + S/N)
•Nyquist sampling rate: fs ≥ 2 × fmax
•PCM bits per sample: n = log₂(L) where L = quantization levels
•SNR for PCM: SNR = 6.02n + 1.76 dB
Antennas
•Free space path loss: FSPL = (4πd/λ)²
•Half-wave dipole length: L = λ/2
•Effective aperture: Ae = Gλ²/4π
Transmission Lines
•Phase velocity: vp = 1/√(LC) = c/√(εr)
•Wavelength: λ = vp/f
•Input impedance of λ/4 transformer: Zin = Z₀²/ZL
GATE vs BSNL JTO — Comparison
| Aspect | GATE | BSNL Direct JTO |
|---|
|--------|------|-----------------|
| Score validity | 3 years | Not applicable |
|---|---|---|
| Subjects | ECE/CSE | ECE + Telecom specific |
| Difficulty | Higher | Moderate |
| Frequency | Annual (February) | As per vacancies |
| Salary after selection | Same (₹60,000+/month) | Same |
| Preference | More predictable | Depends on BSNL policy |
Key Standards Bodies
| Body | Full Name | Manages |
|---|
|------|-----------|---------|
| ITU-T | International Telecommunication Union — Telecom | SDH, PSTN, SS7 |
|---|---|---|
| ITU-R | ITU — Radiocommunication | Spectrum allocation, IMT-2020 (5G) |
| 3GPP | 3rd Generation Partnership Project | GSM, UMTS, LTE, 5G NR specs |
| IEEE | Institute of Electrical & Electronics Engineers | Ethernet, WiFi (802.11), WiMAX |
| IETF | Internet Engineering Task Force | TCP/IP, HTTP, BGP, OSPF, SIP |
| ETSI | European Telecom Standards Institute | NFV, IMS standards |
| TRAI | Telecom Regulatory Authority of India | India regulation |
| DoT | Department of Telecommunications | India licensing |