network protocols handbook.pdf

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154Protocols GuideWAN - ATM Protocols6bits 1bit 1bit 0-47 bytes 0-47 bytesOSF SN P AAL2 PDU payload PADAAL2 CPS PDU• OSF - Offset field. Identifies the location of the start ofthe next CPS packet within the CPS-PDU.• SN - Sequence number. Protects data integrity.• P - Parity. Protects the start field from errors.• SAR PDU payload - Information field of the SARPDU.• PAD - Padding.AAL2 SSCS PacketThe SSCS conveys narrowband calls consisting of voice, voicebanddata or circuit mode data. SSCS packets are transportedas CPS packets over AAL2 connections. The CPS packet containsa SSCS payload. There are 3 SSCS packet types: Type 1Unprotected (This is used by default); Type 2 Partially protected;and Type 3 Fully protected (The entire payload is protected by a10-bit CRC which is computed as for OAM cells. The remaining2 bits of the 2-octet trailer consist of the message type field).AAL2 SSCS Type 3 Packets:The AAL2 type 3 packets are used for Dialed digits, Channelassociated signalling bits, Facsimile demodulated control data,Alarms and User state control operations. The general structureof AAL2 SSCS Type 3 PDUs is shown as follows. The formatvaries according to the actual message type.2bits 14bits 16bits 6bits 10bitsRedundancyTime stampMessagedependantinformationMessagetypeAAL2 SSCS Type 3 PDU – General StructureCRC-10• Redundancy - Packets are sent 3 times to ensureerror correction. The value in this field signifies thetransmission number.• Time stamp - Counters packet delay variation andallows a receiver to accurately reproduce the relativetiming of successive events separated by a shortinterval.• Message dependant information - Packet contentthat varies, depending on the message type.• Message type - The message type code.• CRC-10 - The 10-bit CRC.AAL3/4 PDU:2 4 10 bits 44 Bytes 6 bits 10 bitsST SN MID PDU Payload LI CRC• ST - Segment Type: BOM (Beginning of Message),COM (Continuation of Message), EOM (End of Message),SSM (Single Segment Message).• SN - Sequence number. Numbers the stream of SARPDUs of a CPCS PDU (modulo 16).• MID - Multiplexing Indication• PDU payload - 44-byte user information field.• LI - Length indicator.• CRC - Cyclic redundancy check calculated over theSAR header.AAL3/4 CS PDU:1 1 2 bits 40 Bytes 1 1 2 bitsCPI BTag BAsize PDU Payload + PAD AL ETag LEN• CPI - Common Part Indication• BTag - Beginning Tag• BAsize - Buffer Allocation Size• PDU payload - Variable length user information fieldup to 40 Bytes• PAD - Padding (up to 3 bytes) used to cell align thetrailer.• AL - Alignment. A filling byte coded with zero• ETag - End Tag.• LEN - Length of Information FieldAAL5 CS PDU:0-48 Bytes 0-47 1 1 2 4 BytesPDU payload PAD UU CPI LI CRC-32AAL5 is the simple and efficient AAL (SEAL) most used for datatraffic. It has no per-cell length or per-cell CRC fields.• PDU payload - Variable length user information field• PAD - Padding used to cell align the trailer which maybe between 0 and 47 bytes long.• UU - CPCS user-to-user indication to transfer onebyte of user information• CPI - Common Part Indication• LI - Length indicator.For OA&M cells, there are pre-defined (reserved) VPI/VCI numbers:• 0/0 Unassigned or Idle 0/1 Meta-signaling• 0/3 Segment F4 Flow 0/4 End-to-end F4 flow• 0/5 Signaling 0/15 SMDS• 0/16 Interim Layer Management Interface (ILMI)F4/F5 OA&M PDU format:4 bits 4 bits 45 Bytes 6 bits 10 bitsOAMTypeFunctionTypeFunction SpecReserveCRC-10• OAM type / Function type- The possible values forOAM type and function type are defined for Fault,Performance, Activation/Deactivation• CRC-10 - Cyclic redundancy check calculated overthe SAR header. G(x) = x 10 +x 9 +x 5 +x 4 +x+1Related <strong>protocols</strong>
155Protocols GuideWAN - ATM ProtocolsSONET, AAL0-AAL5, LAN Emulation, CES, PNNI and MPOA,Q.2931Sponsor SourceATM Adaptation Layers are defined by ITU in documentI.366.2.Referencehttp://www.atmforum.com/standards/approved.htmlATM Forum approved specificationshttp://www.atmforum.com/standards/approved.html#uniATM User-Network Interface Specificationhttp://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/atm.htmATM Overview
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ITable of ContentsTable of Contents
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IVTable of ContentsCR-LDP: Constrai
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VITable of ContentsCOPS: Common Ope
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VIIITable of ContentsGARP: Generic
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XTable of ContentsIGRP: Interior Ga
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XIIFigureFigureFigure 1-1: Communic
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XIVPerfacePrefaceWe are living in t
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2Network Communication Architecture
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10Network Communication Architectur
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12Protocols GuideTCP/IP Protocolspo
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14Protocols GuideTCP/IP - Applicati
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52Protocols GuideTCP/IP - Session L
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54Protocols GuideTCP/IP - Transport
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64Protocols GuideTCP/IP - Network L
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98Protocols GuideTCP/IP - Data Link
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100Protocols GuideTCP/IP - Data Lin
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102Protocols GuideSecurity and VPNP
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204Protocols GuideLAN - Virtual LAN
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210Protocols GuideLAN - Wilress LAN
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216Protocols GuideLAN - Other Proto
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222Protocols GuideMAN ProtocolsProt
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224Protocols GuideMAN Protocols(0).
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226Protocols GuideStorage Area Netw
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228Protocols GuideSAN ProtocolsProt
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230Protocols GuideSAN ProtocolsThe
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232Protocols GuideSAN Protocols•
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234Protocols GuideSAN ProtocolsSpon
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240Protocols GuideISO Protocols in
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242Protocols GuideISO Protocols - A
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262Protocols GuideISO Protocols - N
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268Protocols GuideCisco ProtocolsPr
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278Protocols GuideCisco Protocolsti
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280Protocols GuideNovell NetWare an
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288Protocols GuideIBM ProtocolsSNAT
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290Protocols GuideIBM ProtocolsProt
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292Protocols GuideIBM ProtocolsSNA
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300Protocols GuideAppleTalk: Apple
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302Protocols GuideDECnet and Protoc
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304Protocols GuideSS7 / C7 Protocol
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318Protocols GuideOther Protocols
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320Protocols GuideOther ProtocolsPr
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322Protocols GuideOther ProtocolsPr
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324Network Protocols Dictionary: Fr
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342Network Communication Protocols
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