ADTRAN Total Access 5000 Deployment Guide

Appendix D, TWAMP Provisioning - TWAMP Provisioning
65K510DEP08-1A D-3
Ifthesenderandreceiveraddressesaresetto0,thentheIPaddressesusedintheIPpacket
thatencapsulatestherequest‐sessioncommandshallbeusedinthetestpackets.
Thetimeoutintherequest‐sessioncommandshallbeusedbythesession‐reflectorasthe
amountoftime
thatthereflectormustwaitafterreceivingastop‐sessionsmessage.The
reflectorshallkeepreflectingpackets untilthisamountoftimepasses.Afterthis,thereflector
stopsreflectingpackets.
Thetype‐PdescriptorwasusedtosettheDSCPorPHBinthemessagefromthesender.The
reflectorshould
usethesesamevaluesinthereflectedpacket.
ThesendschedulefortestpacketsisNOTusedinTWAMP.Thesendershouldautonomously
decidethesendschedule.
TWAMP Active Test Session
Atthispoint,aswitchismadefromusingTCPtousingtheUDPprotocol.WithTWAMP,the
session‐reflectorsendsouttestpacketsinresponsetoeachtestpacketitreceives.
Thesendscheduleisnotcommunicatedtothesession‐reflector.Assuch,thereisnoneedfor
astandardized
computationofpackettiming.Thesender,though,shouldhaveitsbest
approximationofitsrealtimeplacedintothedeparturetimestampfield.
TheTWAMPsession‐reflectortimestampsthereceivedpacket,copiesthepacketsequence
numberinthecorrespondingreflectedpacketfield,transmitsthereflectedpacket,andignores
packetsreceivedaftertheʺ
stop‐sessioncommand+timeoutʺ.
TheTWAMPtestpacketfromthereflectorconsistsofthefollowingparameters:
•Sequencenumber‐isthesequencenumberofthetestpacketaccordingtoitsarrivaltime
atthesession‐reflector.Thisvalueshouldstartwithzeroandincrementbyoneforeach
subsequentpacket.This
isindependentfromthesequencenumberofthearriving
packets.
•Timestamp‐thesessionreflectorʹstransmittimestamp.Formatissameasusedin
OWAMP.
•Errorestimate‐thetimeerrorestimateinthesessionreflectorʹstransmittimestamp.
FormatisthesameasusedinOWAMP.
• Receivetimestamp‐thesessionreflectorʹsreceive
timestamp.Formatissameasusedin
OWAMP.Thedifferencebetweentimestam pandreceivetimestampistheamountof
timethepacketwasintransitionatthesession‐reflector.Theerrorestimateassociated
withtimestampalsoapplieshere.
• ʺSenderSequenceNumber‐anexactcopyofthesequencenumberfromthe
session
sendertestpacket.
•SenderTimestamp‐anexactcopyofthetimestampfromthesession‐sendertestpacket
•SenderErrorEstimate‐anexactcopyoftheerrorestimatefromthesession‐sendertest
packet
•Packetpadding‐anexactcopyof thepacketpaddingfromthesession‐sendertestpacket

ADTRAN Total Access 5000 Specifications

Interfaces

craft interface	DB-9 RS-232 Electrical Interface (Async)
admin interface	DB-9 RS-232 DTE Electrical Interface (Async with Modem Control Signals)
network management port	DB-9 RS-232 DTE Electrical Interface (Async)
ethernet interface	10Bt
external alarm inputs	16

Operating Environment

operating temperature	-40°C to +65°C
storage temperature	-40°C to +70°C
relative humidity	Up to 95%, non-condensing

Weight and Dimensions

height	9.25 in.
width	0.08 in.
depth	9.5 in.
weight	0.6 lbs.