Data communication and computer network

wØZxq Aa¨vq
†WUv KwgDwb‡Kkb I Kw¤úDUvi †bUIqvK©

Communication System (†hvMv‡hvM e¨e¯’v)

GK cÿ n‡Z Ab¨ c‡ÿ †Kvb gva¨‡gi Øviv Z_¨ cÖev‡ni cÖwµqv‡K †hvMv‡hvM ejv nq| †h e¨w³ wb‡Ri wPšÍv fvebv I
e³e¨ Ab¨‡`i‡K Rvbv‡bvi Rb¨ Zv‡`i Kv‡Q cvwV‡q w`j wZwb n‡jb †cÖiYKvix (cÖ_g cÿ)| †h e¨w³ †cÖiYKvixi KvQ
†_‡K Z_¨wU MÖnY Ki‡jv Ges †m Abyhvqx mvov w`j wZwb n‡j MÖnYKvix (wØZxq cÿ)| †hvMv‡hvM cÖwµqvq e³v hv
e‡j‡Q †m Z_¨wU ûeû MÖnYKvixi Kv‡Q †cuŠQv‡Z nq| MÖnYKvix hw` e³vi cÖwZ †Kvb ai‡bi mvov w`‡Z e¨_© nq Z‡e †m †hvMv‡hvM‡K AKvh©Ki I Am¤ú~Y© e‡j MY¨ Kiv nq|

Data Communication (Z_¨ †hvMv‡hvM)

†h cÖwµqvq data †Kvb GKwU computer/system n‡Z Ab¨ †Kvb GK ev GKvwaK computer/system-G

network-Gi mvnv‡h¨ ¯’vbvšÍi Kiv nq Zv‡K Data Communication e‡j|

Source (Drm)t †h system/device n‡Z data †cÖiY Kiv nq Zv‡K Source e‡j| Computer, telephone,

mobile BZ¨vw` data-Gi source wn‡m‡e KvR K‡i _v‡K|

Transmitter (†cÖiK)t Data-†K `~ieZ©x ¯’v‡b ev wbw`©ó ¯’v‡b †cÖi‡Yi Rb¨ modulation-Gi cÖ‡qvRb nq|

Digital data-†K analog signal-G iƒcvšÍwiZ Kivi cÖwµqv‡K modulation e‡j| Avi modulation-Gi

KvRwUB Transmitter As‡k m¤úbœ nq| NIC (Network Interfacing Card), modem BZ¨vw` transmitter

wn‡m‡e KvR K‡i _v‡K|

Medium (gva¨g)t Data GK ¯’vb n‡Z Ab¨ ¯’v‡b †cÖi‡Yi Rb¨ Medium-Gi cÖ‡qvRb nq| Avi GB medium

n‡Z cv‡i Zvihy³ A_ev Zviwenxb| Zvihy³ medium-Gi g‡a¨ i‡q‡Q telephone line, optical fiber, coaxial cable BZ¨vw`| Avi Zviwenxb medium-Gi g‡a¨ i‡q‡Q radio wave, micro wave, satellite BZ¨vw`|