NG-Transport Tech Lecture15-16.ppt

NG-Transport Tech Lecture15-16.ppt - NG TRANSPORT...

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1 NG TRANSPORT TECHNOLOGIES Delivered By: Mansoor Ul Hassan ICT, PTCL, Islamabad
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2 SDH vs. SONET SONET can be thought of as the North American version of SDH The main differences are in the basic SDH and SONET frame formats, but SDH and SONET are essentially identical beyond the STS-3 signal level The base signal for SONET is STS-1 and the base signal for SDH is STM-1. STS-3c is equivalent to STM-1 and the lower tributaries can be mapped interchangeably between the two formats from that point on.
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3 Continue… In SDH, both electrical and optical signals are referred to as STM signals. In SONET, however, electrical signals are called STS and optical signals are referred to as OC.
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4 SONET/SDH Digital Hierarchy Optical Level SONET Electrical Level SDH Equivalent Line Rate (Mbps) Payload Rate (Mbps) Overhead Rate (Mbps) SONET Capacity SDH Capacity OC-1 STS-1 51.840 50.112 1.728 28 DS-1s or 1 DS-3 21 E1s OC-3 STS-3 STM-1 155.520 150.336 5.184 84 DS-1s or 3 DS-3s 63 E1s or 1 E4 OC-12 STS-12 STM-4 622.080 601.344 20.736 336 DS-1s or 12 DS-3s 252 E1s or 4 E4s OC-48 STS-48 STM-16 2488.320 2405.376 82.944 1,344 DS-1s or 192 DS-3s 1,008 E1s or 16 E4s OC-192 STS-192 STM-64 9953.280 9621.504 331.776 5,376 DS-1s or 192 DS-3s 4,032 E1s or 64 E4s Note: Although an SDH STM-1 has the same bit rate as the SONET STS-3, the two signals contain different frame structures. STM = S ynchronous T ransport M odule (ITU-T) STS = S ynchronous T ransfer S ignal (ANSI) OC = O ptical C arrier (ANSI)
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5 SDH and SONET Bit Rate SDH SDH SDH SDH Bit Rate Bit Rate Bit Rate SONET SONET SONET STM-1 STM-1 STM-1 STM- STM- 64 64 STM- 64 OC- OC- 192 192 OC- 192 OC-3 OC-3 OC-3 9.95Gb/s 9.95Gb/s 9.95Gb/s 155Mb/s 155Mb/s 155Mb/s STM-4 STM-4 STM-4 OC-12 OC-12 OC-12 622Mb/s 622Mb/s 622Mb/s STM- STM- 16 16 STM- 16 16 OC-48 OC-48 OC-48 2.48Gb/s 2.48Gb/s 2.48Gb/s STM-0 STM-0 STM-0 OC-1 OC-1 (STS-1) (STS-1) OC-1 (STS-1) (STS-1) 51Mb/s 51Mb/s 51Mb/s
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6 NGSDH
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7 WHY NGSDH Data traffic is growing exponentially Accommodating this traffic is must Data traffic handling is limitation of SDH Need for new system which can support data
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8 WHY NGSDH The data packet transport (Ethernet, PPP) is a challenge for SDH This is because they are connectionless, use statistical multiplexing, and can be best-effort technologies This is the opposite of SDH which is predictable and based on time division multiplexing (TDM)
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9 Continue…. Two options Some modification to existing SDH Metro Ethernet First option will save investment already made in SDH No need for major modification
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10 Trouble with SDH The traffic type is changing Challenge… How to use bandwidth efficiently for both voice and data traffic Lack of fine granularity to accommodate all potential clients’ stream rates
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11 What is NGSDH SDH with Data handling capability Simply addition of 3 functions to accommodate Data traffic (to encapsulate Ethernet frame) GFP VCAT LCAS
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12 NGSDH- Ethernet Over SDH
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13 Ethernet Over SDH SDH SDH SDH SDH SDH SDH SDH SDH METRO NETWORK SDH Ring-1 SDH Ring-2
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14 NG SDH – Drivers The drive to SDH Next Generation development was:
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  • Fall '19
  • Synchronous optical networking, Multiplexing, Wavelength-division multiplexing, osc, NG SDH

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