CTC Union ET100A User manual

ET100A [ver2]
Synchronous WAN Ethernet Bridge
10/100Base-TX Ethernet over
V.35, X.21, RS-232/530/449
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CTC Union Technologies Co., Ltd.
NeihuTechnologyPark
ViennaTechnologyCenter
8F,No.60ZhouziSt.
Neihu,Taipei,114
Taiwan
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ET100AEthernetWANBridge,UserManual
Version2.0March21,2014Release
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Thismanualsupportsthefollowingmodels:
ET100AEthernetWANBridge
(manufacturedafterMarch2014)
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Allspecificationssubjecttochangewithoutnotice.

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Table of Contents
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OVERVIEW........................................................................................................ 7
FEATURES ......................................................................................................... 7
SPECIFICATIONS ................................................................................................ 8
THEORYOFOPERATION .................................................................................. 13
DIPSWITCHSETTINGTABLES:.......................................................................... 16
WANPORTPINASSIGNMENT.......................................................................... 20
CABLEPINASSIGNMENTS: .............................................................................. 24
RS‐530CABLE,25CONDUCTORROUND,1TO1,1M....................................................24
V.35CABLE,MULTI‐CONDUCTORROUND,1M..............................................................25
RS‐449CABLES,MULTI‐CONDUCTORROUND,1M........................................................26
X.21CABLES,MULTI‐CONDUCTORROUND,1M............................................................27
APPLICATIONEXAMPLES................................................................................. 28
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Table of Contents
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Thispageleftblankintentionally.
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ET100A LAN-WAN Bridge
7
Overview
TheET100ANetworkBridgeisahighperformance,remote,
self‐learningEthernetbridge.Itscompactsizeandlowcostmakeitideal
forcost‐sensitivebridgingapplications,orasaLANextenderorsegmenter
overbitstreamtypeinfrastructures.Severalselectablesynchronousdata
interfaces,includingV.35,RS‐530,RS‐449,X.21,andRS‐232,makethis
EthernetBridge'sconnectionbetween10Base‐Tand100Base‐TXLANand
variousSYNCdataportinterfacesconvenient.
Features
Supports raw HDLC, Cisco® HDLC, and PPP encapsulation
10BASE-T/100BASE-TX, Full Duplex or Half Duplex
HPAuto-MDI/MDIX detects and corrects crossed cable
Automatic address learning, aging and deletion after 5 minutes
Forwarding and filtering rate at wire speed with through put latency of
1 frame.
Auto padding of undersized packets to meet the minimum Ethernet
packet size requirement
1763 packet buffer
Ethernet interface has automatic Twisted Pair polarity correction
Built-in nx64K / nx56K timing clock generator for WAN link for speeds
up to 10mbps
256 MAC Table
Ethernet flow control per IEEE802.3x

ET100A LAN-WAN Bridge
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Specifications
LAN
Standard Fully compliant with IEEE 802.3/802.3u, 802.3x
Connector Shielded RJ-45
Speeds 10BASE-T/100BASE-TX, Full or Half Duplex
MTU 1536 bytes
MAC Table 256 addresses
WAN
Interface Selectable RS-232(SYNC), V.35, RS-449/530, and
X.21
Protocol Synchronous HDLC, PPP or Cisco® HDLC
Buffer 1763 Packets
Connector DB25 Male
Type DTE port
Data Rates n x 64(56)Kbps, up to 10Mbps
Clock Source Internal or External
General
Power AC Adapter; EUP 100~240VAC / 12VDC-1A
Unit; DC9~12V/300mA
Environment Temperature: 0~50oC
Humidity: <90% non-condensing
Dimensions 135(L) x 80(W) x 25(H) mm
Weight 150g
LED INDICATORS
SYNC (green) ON=WAN Protocol Up
LINK (green) ON=receiving CTS and DSR signal
Rx (green) ON=WAN receive data (blinking)
Tx (green) ON=WAN transmit data (blinking)
PWR (green) ON=Power OK
ERROR (red) OFF=system OK,
2 pulse=configuration error; 3 pulse=WAN CRC
ACT (green) OFF=No link; Blinking=receiving data
LINK (green) ON=LAN linked; OFF=no link

ET100A LAN-WAN Bridge
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Clock
Generator
SYNC
SPEED
N56K to
1792K
N64K to
10M
Interface
Select
RS-530/449 Serial Port
Line Drivers
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Figure1:ET100AFunctionalBlockDiagram
V.35
X.21
RS-232
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SYNC
HDLC
CONTROLLER
Full Du
p
lex
Half Du
p
lex
Ext. clock
Int. clock
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FILTER
ENGINE
MAC Address Table
Frame Buffe
r
WAN SIDE
DB25-Male
DTE
LAN SIDE
RJ-45
ERROR
Clock
Source
LINK
Tx LED
Rx LED
SYNC
ACT
LINK
IEEE802.3u I/F

ET100A LAN-WAN Bridge
Unit Detail
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23
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Figure2.ET100AUnitDetail
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ET100A LAN-WAN Bridge
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(1) DB25MaleConnector:
Thisconnectorconnectstotheappropriateadaptercablefor
connectiontothevarioussupporteddatainterfaces.TheET100A
performsinDTEmodeanditsWANportconnectormaybe
connecteddirectlytoaDCEdevice(suchasamodemorDSU/CSU).
(2) SYNCLED:
Green,whereONindicatesprotocolisup.IfOFF,firstmakesure
physicallinkisup,thenmakesureprotocolsettingsmatch.
(3) LINKLED:
Green,whereONindicatesthepresenceofCTS/DSRsignalonWAN
connection.
(4) RXLED:
Green,onorflashingindicatesreceivingdataontheWANinterface.
(5) TXLED:
Green,onorflashingindicatestransmittingdataontheWAN
interface.
(6) SW1:
Configurationsettingforthebridge.(PleaserefertoDIPSWsetting
table.)
(7) SW2:
Configurationsettingforthebridge.(PleaserefertoDIPSWsetting
table.)
(8) RJ‐45EthernetLANPort:
Thisisanauto‐MDI/MDIXportforconnectiontotheLAN.

ET100A LAN-WAN Bridge
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(9) LINKLED:(LAN)
Green,indicatestheEthernethasalinktoanexternaldevice.
(10) ACTLED:(LAN)
Green,indicatesdatabeingreceivedfromtheLANconnection.
(11) ERRORLED:
Red,indicatesanerrorconditionasfollows:
ON‐SystemError
Pulse2‐Configurationerror
Pulse3‐WANreceivehasCRCerrors
(12) PWRLED:
Greenon,whenexternalpoweradapterispluggedinandACpower
issuppliedtoit.
(13)DC9~12V
ThisjackreceivespowerfromtheexternalDC12VACpower
switchingadapter.Thecenterpinispositivevoltage.
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ET100A LAN-WAN Bridge
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Theory of Operation
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Abridgeisusedtoconnectnetworkslocallyorremotelysuchthat
theyappeartotheusertobethesamenetwork.AnEthernetLANbridge
willconnecttwoLANsegmentsattheDataLinkLayer(ISOLayer2).Atthis
layer,theMAC(MediaAccessControl)addresses,areusedforlowlevel
addressingtosendinformationtodevices.ThebridgebuildstablesofMAC
addressesforeachnetworksegmentbasedonthesourceanddestination
addressesofthepacketsitreceivesandforwards,thenfiltersthetraffic
notdestinedfortheremotenetwork.
TheEthernet‐WANbridgewillconnecttworemoteEthernet
networksoverbitstreaminterfacessuchasthatofsynchronousmodems
orDSU/CSUs.OnemethodtodothisistouseHDLC,aninternational
standardsetbytheISO,asetofprotocolsforcarryingdataoveralinkwith
errorandflowcontrol.AnothermethodusesPPPandathirdusesCisco®
HDLC.
TheET100AutilizesbothEthernetBridgingandencapsulationto
provideaconnectionbetweenLANsoverbitstreamarchitectures.The
LANsideoftheET100AreceivesanEthernetpacketandexaminesits
destinationMACaddress.IfitknowstheMACisonthelocalnetworkthen
itsimplydropsthepacket.Otherwise,ifitknowsthepacketdestinationis
ontheremoteside,orifitcannotbedeterminedbecauseitsMACcannot
befoundinthetable,thenitforwardsit.Duringforwarding,thepacketis
processedfortransmissionacrosstheWANlink.Hereiswherethe
Ethernetpacketinencapsulated.

ET100A LAN-WAN Bridge
WhentheHDLCorPPPpacketisreceivedontheremotesideunit's
dataport,thepacketischeckedfortransmissionerrors,thentheoriginal
Ethernetpacket(s)isrecoveredandsentouttheremote'sLANport
completingthetransmission.Hereisthetypicalapplicationofthe
ET100A.
ET100A/V35 ET100A/V35
Figure3.TypicalapplicationofET100ALAN‐WANBridge.
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ManytimestheET100AiscommonlyreferredtoasanEthernetto
V.35,EthernettoX.21,orEthernettoDatacom'converter'.Asa
sales/marketingtermornon‐technicalreference,thetermisOK.However,
fromatechnicalstandpoint,thetermisamisnomer.TheEthernetisnot
"converted"toV.35,itisrun"over"theV.35link.Conversionalsoimplies
thattheinterfacecanworkbothways.ThisisNOTthecaseforthe
LAN‐WANBridgeasthefollowingapplicationshows.
ET100A/V35 ET100A/V35
Figure4.ApplicationNOTALLOWEDforET100A.
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ET100A LAN-WAN Bridge
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Whydoesthepreviousapplicationnotwork?Itwon'tworkbecause
theapplicationrequiresabitstreamtobeencapsulatedintoEthernet
packets,orintoTCP/IPandthenEthernet,fortransmissionacrosstheLAN.
ThisrequiresmorethanjustmanipulationattheDataLinklayer(ISOLayer
2),itrequiresprogrammingtoincludeallsevenlayersincludingthe
Applicationlayer.TransmittingbitstreamorTDM(timedivision
multiplexed)dataoverEthernetrequiresadevicesuchasan
IP‐Multiplexer.
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Pleaserefertothe"Applications"sectionattheendofthismanual
foradditionalapplicationexamples.

ET100A LAN-WAN Bridge
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DIP Switch Setting Tables:
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SW1-1 SW1-2 FUNCTION REMARK
OFF ON HDLC
ON OFF Cisco® HDLC
OFF OFF PPP
Table1:EncapsulationProtocolSetting

DIP SW1 STATE FUNCTION REMARK
OFF WAN CLK: External-3 ON WAN CLK: Internal
Table2:ClockSourceSetting

DIP SW1 STATE FUNCTION REMARK
OFF CTS/DSR-4 ON Active DCD always on
Table3:DCDHandshakingSetting

DIP SW1 STATE FUNCTION REMARK
OFF Enable 802.3x-5 ON Disable
Table4:LANFlowControlSettings
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SW1-6 SW1-7 SW1-8 Function REMARK
OFF X X Auto SW1-7,1-8 don't care
ON OFF OFF 100/Full
ON OFF ON 100/Half
ON ON
OFF 10/Full
ON ON ON 10/Half
Table5:LANInterfaceSetting

SW2-1 SW2-2 TYPE
OFF OFF V.35
ON OFF X.21/RS-530/RS-449
ON ON RS-232
Table6:WANInterfaceTypeSetting

ET100A LAN-WAN Bridge
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WhentheET100AissettointernalWANclock,SW2‐3toSW2‐9
provisionthedatarate.IfWANclockissetexternal,theseareignored.

SW2-3 SW2-4 SW2-5 SW2-6 SW2-7
SW2-8 OFF SW2-8 ON SW2-8 OFF SW2-8 ON
SW2-9 OFF
N*64K SW2-9 OFF N*56K SW2-9 ON HS-1 SW2-9 ON HS-2
OFF OFF OFF OFF OFF 64K 56K 2176K 6272K
ON OFF OFF OFF OFF 128K 112K 2304K 6400K
OFF ON OFF OFF OFF 192K 168K 2432K 6528K
ON ON OFF OFF OFF 256K 224K 2560K 6656K
OFF OFF ON OFF OFF 320K 280K 2688K 6784K
ON OFF ON OFF OFF 384K 336K 2816K 6912K
OFF ON ON OFF OFF 448K 392K 2944K 7040K
ON ON ON OFF OFF 512K 448K 3072K 7168K
OFF OFF OFF ON OFF 576K 504K 3200K 7296K
ON OFF OFF ON OFF 640K 560K 3328K 7424K
OFF ON OFF ON OFF 704K 616K 3456K 7552K
ON ON OFF ON OFF 768K 672K 3584K 7680K
OFF OFF ON ON OFF 832K 728K 3712K 7808K
ON OFF ON ON OFF 896K 784K 3840K 7936K
OFF ON ON ON OFF 960K 840K 3968K 8064K
ON ON ON ON OFF 1024K 896K 4096K 8192K
OFF OFF OFF OFF ON 1088K 952K 4224K 8320K
ON OFF OFF OFF ON 1152K 1008K 4352K 8448K
OFF ON OFF OFF ON 1216K 1064K 4480K 8576K
ON ON OFF OFF ON 1280K 1120K 4608K 8704K
OFF OFF ON OFF ON 1344K 1176K 4736K 8832K
ON OFF ON OFF ON 1408K 1232K 4864K 8960K
OFF ON ON OFF ON 1472K 1288K 4992K 9088K
ON ON ON OFF ON 1536K 1344K 5120K 9216K
OFF OFF OFF ON ON 1600K 1400K 5248K 9344K
ON OFF OFF ON ON 1664K 1456K 5376K 9472K
OFF ON OFF ON ON 1728K 1512K 5504K 9600K
ON ON OFF ON ON 1792K 1568K 5632K 9728K
OFF OFF ON ON ON 1856K 1624K 5760K 9856K
ON OFF ON ON ON 1920K 1680K 5888K 9984K
OFF ON ON ON ON 1984K 1736K 6016K 10112K
ON ON ON ON ON 2048K 1792K 6144K 10240K
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Table7:DataRateSettings

ET100A LAN-WAN Bridge
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WhentheET100Aleavesthefactory,allDIPswitchsettingsareset
totheOFFposition.

Auto‐negotiation:
Whenthisfeatureisenabled(SW1‐6=OFF),theSpeed(SW1‐7)and
Duplex(SW1‐8)settingsareignoredandareautomaticallydetermined
fromtheLANconnection.Whenthisfeatureisdisabled(SW1‐6=ON),the
DuplexandSpeedsettingsoftheLANfollowthesettingsofSW1‐7and
SW1‐8.UseforcedmodewithcautiontoavoidDuplexMismatch.

ProtocolSelection:
TheET100Asupportsselectingoneofthreeencapsulationprotocols.
WhenselectingHDLC,theencapsulationisperISO13239.ThecHDLC
encapsulationiscompatiblewithCisco®modifiedHDLC.ThePPP
encapsulationfollowsRFC1661andisalsoaverypopularencapsulation
protocol.TheprotocolselectioniscontrolledbythesettingofDIPswitches
SW1‐1andSW1‐2.

ClockSelection:
TheET100AinherentlyactsasaDTEdevice.A1:1cableisusedto
connecttoaDCEdevicesuchasamodem,CSU/DSUordatamultiplexer.
ClocksourcecomesfromtheDCEsotheclocksettingisusuallyexternal
(SW1‐4OFF).TheET100AisalsocapableofactingasaDCE.Inthiscasea
crossovercableisrequiredandclocksetting(SW1‐4ON)isinternal.Data
rateisthensetbySW2,3~9andET100Aprovidesclocksource.

ET100A LAN-WAN Bridge
19

LANFlowControl:
TheET100ALANportsupportsIEEE802.3xflowcontrol,whichcan
helptoregulatethehigherspeedLANtrafficthathitsthebottleneckof
theslowerWANspeed.Withoutflowcontrol,theLANpacketsthatexceed
theWANspeedwillbedroppedandtheresultingtimeoutcausedmustbe
handledbytheapplicationlayer.

LANAutoNegotiation:
TheET100ALANportsupportsauto‐negotiationperIEEE802.3u.
WhenautonegotiationisenabledandtheLANportconnectstoanother
autonegotiationcompliantport,theLANspeedwillbeautodetected
whiletheDuplexshouldbenegotiatedtoFullDuplex.
Whenconnectingtolegacyequipment,itmaybenecessaryto'force'
thespeedandDuplexontheLANport.Caremustbetakenheretoavoida
DuplexMismatchconditionwhena'forced'portconnectstoan'auto'port.
Withoutnegotiation,an'auto'portwillreverttoHalfDuplexperthe
IEEE802.3ustandard.ADuplexMismatchconditioncouldresultin
extremelypoornetworkperformance.

WANInterfaceSelection:
TheET100Ahasselectablehardwareinterfacecircuits.Whensetto
X.21/RS‐530/RS‐449,thelogic,clockandhandshakingsignalsallfollow
RS‐422electrical(balancedsignals).WhensettoRS‐232,allsignals
becomesingleendedandfollowRS‐232Dsignallevels.Whenconfiguredas
V.35,thelogicandclocksignalsfollowRS‐422electrical,whilehandshaking
signalsareRS‐232electrical.


ET100A LAN-WAN Bridge
20
WAN Port Pin Assignment
Thefollowingtablesgivethepin,circuit,functionandsignaldirection
asseenontheET100A'sDB25Mconnectorforeachoftheselectable
interfaces.RS‐232andRS‐530connectionsmaybemadedirectly.
AdaptercablesarerequiredtomatchthephysicalconnectorsforV.35
(MB34),X.21(DB15)andRS‐449(DB37).

a.V.24/RS‐232INTERFACEPINASSIGNMENT
PIN CIRCUIT FUNCTION DIRECTION EIA
1FGNDProtectiveGNDAA
2TDTransmitdataOUTBA
3RDReceivedataINBB
4RTSRequesttosendOUTCA
5CTSCleartosendINCB
6DSRDatasetreadyINCC
7GNDSignalgroundAB
8DCDCarrierdetectINCF
15TCTransmitclockINDB
17RCReceiveclockINDD
20DTRDatatermreadyOUTCD
24XTCDTExmitclockOUTDA
Table8:RS‐232InterfacePinAssignment
SW2‐1/2 ON/ON
