Manuale d’uso / di manutenzione del prodotto SMC7401BRA del fabbricante SMC Networks
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2-P ort Br oadband Router with Built-in ADSL Modem ◆ Compatible with all leading DSLAMs ◆ Supports DMT line modulation ◆ Supports full-rate ADSL (G.992.1 & T1.413, Issue 2) - Up to 8 Mbps do wnstream and 640 Kbps upstream ◆ Supports G.lite ADSL (G.
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38 T esla Irvine, CA 92618 Phone: (949) 679 -8000 ADSL Router User Guide Fr om our line of ADSL solu tions May 2002 Part No: xx Pub No: 150000014500E R01.
Infor mation furnishe d is believed to be accurate and reliable. However, no responsibil ity is assumed by o ur company for it s use, nor for any inf ringemen ts of patents or ot her rights of th ird partie s which may result from its us e. No license is granted b y implication or oth erwise under any paten t or patent rights of ou r company .
i L IMITED W ARRANTY Limited W arranty Statement: SMC Netw orks, Inc . (“SMC”) warrants its products to be free from defects in workmanship and materials , under nor mal use and ser vice, for the applicable warranty ter m. All SMC products carr y a standard 90 -day limited warranty from the date of purchase from SMC or its Authorized Reseller .
L IMITED W AR RANTY ii WARRANTIES EX CLUSIVE: IF AN SMC PRODUCT DOES NOT OPERATE AS W ARRANTED ABO VE, CUSTOMER’ S SOLE REMED Y SHALL BE REP AIR OR REPLA CEMENT OF THE PRODUCT IN QUESTION , AT SMC’S OPTION .
iii C OMPLIANCES FCC - Class B This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to P ar t 15 of the FCC Rules . T hese limits are designed to provide reasonable protection against har mf ul interference in a residential installation.
C OMPLIANCES iv The telephone company may make changes in its facilities , equipment, operations, or procedures that will provide adva nce notice in order for you to make the necessar y modifications in order to maintain uninterr upted ser vice.
C OMPLIANCES v EC Confor mance Declaration - Class B This infor mation technolog y equipment complies with the requirements of the Council Directiv e 89/336/EEC on the Approximation of the la ws of th.
C OMPLIANCES vi T aiwan BSMI Class A Australia AS/NZS 3548 (1995) - Class B.
vii T ABLE OF C ONTENTS 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Networking Concept s . . . . . . .
T ABLE OF C ONTENTS viii WAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 Asynchronous Transfer Mode (ATM) . . . . . . . . . . . . . . . . . 3-9 Protocol Encapsulation . . . . . . . . . . . . . . . .
T ABLE OF C ONTENTS ix Windows NT 4.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10 Step 1. Configure TCP /IP Settings . . . . . . . . . . . . . . . . . . . . . . 4-10 Step 2. Disable HTTP P roxy . . . . . . .
T ABLE OF C ONTENTS x.
1-1 C HAPTER 1 I NTRODUCTION Congratulations on your purchase of the Barricade 2-P or t Broadband Router with built-in ADSL Modem. W e are proud to provide you with a pow erful yet simple communication device for connecting your PC to the Internet.
I NTR ODUCTION 1-2 ser vices requiri ng guaranteed Quality of Ser vice (Q oS). The Bar ricade enables tr ue telecommuting f or the first time. It also provides multiprotocol encapsulation for bridging.
F EATUR ES AND B ENEFITS 1-3 • Supports pass-through for three of the most commonly used Virtual Private Network (VPN) protocols – PPTP, L2TP, and IPSec • Security protocols, including Password .
I NTR ODUCTION 1-4 Networking Concepts ADSL Digital Subscriber Line (DSL) tec hnolog y transmits both data and v oice ov er ordinar y tele phone lines . Signals above 4 kHz are cut off in nor mal telephone communications as noise, so DSL uses this spectr um to transmit data.
N ETWORKING C ONCEPTS 1-5 Data flows are broken up into fixed length cells , each of which contains a Virtual Pa th Identifier (VPI) that identifies the path betw een two nodes , and a Vir tual Ci rcuit Identifi er (VCI) that identifies the data channel within that virtual path.
I NTR ODUCTION 1-6 Routing If A TM Protocol Encapsulation is set for PPP/A TM or IP/ATM, the router will forward incoming IP packets and use RIP 2 for routing path management if enabled.
N ETWORK A PPLICATIONS 1-7 Network Applications The Bar ricade can be configured as a bridge for making a transparent connection to a remote site, or as a router for accessing the Internet. T hese applications are briefly described in the following sections.
I NTR ODUCTION 1-8 Figure 1-1. Transparent Bridged Network Accessing the Internet T o access the Inter net, whic h uses TCP/IP protocols ex clusiv ely , the Bar ricade must be configured to function as a router.
N ETWORK A PPLICATIONS 1-9 When the system is powered on, the Bar ricade builds its own routing database according to previous static routing entries, and/or collects routing infor mation from adjacent routers through RIP 2 protocol.
I NTR ODUCTION 1-10.
2-1 C HAPTER 2 I NSTALLATION Before installing the Bar ricade, verify that you have all the items listed under “P ackage Contents .” If any of the items are missing or damaged, contact your local distributor . Also be sure that you hav e all the necessary cabling before beginning the installation.
I NSTALLATION 2-2 Hardware Description The Bar ricade provides a high-speed Asynchronous Digital Subscriber Line (ADSL) that connects to a remote site (via bridging) or to the Internet (via routing). It transports data o ver standard telephone wire at full-rate ADSL (G .
H ARDWARE D ESCRIPTION 2-3 Slow blink: 1 s econd ON, 1 second OFF Data blink: Cycle dependent on data being sent/receiv ed Rear Panel The rear panel provides the follo wing por ts: • One USB port for connection to a PC • One RJ-45 port for connection to a 10BASE-T/100BASE-TX Ethernet Local Area Network (LAN).
I NSTALLATION 2-4 System Requirements Y ou must hav e access to an ADSL network that meets the follo wing minimum requirements: • ADSL service from your local telephone company or Internet Service Provider (ISP), or access to an ADSL Digital Subscriber Line Access Module (DSLA M) at your local site.
C ONNECT THE S YSTEM 2-5 Connect the System Phone Line Configuration Installing a Full-rate Connection If you are usin g a full-rate (G .dmt) connection, your ser vice provider will attach the out side ADSL line to a data/voice splitter . In this case y ou can connect your phones and computer directly to the splitter as sho wn below: Figure 2-2.
I NSTALLATION 2-6 Installing a Splitterless Connection If you a re using a splitterl ess (G .lite) connecti on, then your service provider will attac h the outside ADSL line directly to your p hone system.
C ONNECT THE S YSTEM 2-7 Connect the ADSL Line Ru n standard tele phone cable from the w all jack providing ADSL ser vice to the ADSL port on your Barricade. When inserting an RJ-11 plug, be sure the tab on the plug clicks into pos ition to ensure that it is properly seated.
I NSTALLATION 2-8 Notes: 1. Use 100-ohm straight-through shielded or unshielded twisted-pair cable with RJ-45 connectors at both ends for all connections. Use Category 3, 4, or 5 for 10 Mbps connections, or Category 5 for 100 Mbps connections. 2. Make sure eac h twisted-pair cable does not exceed 100 meters (328 feet).
3-1 C HAPTER 3 W EB -B ASED M ANAGEMENT Web-Based Configuration and Monitoring The ADSL Bar ricade provides an embedded HTTP W eb agent. T his agent can be accessed by any computer on the network using a J av a -supported W eb browser (including Internet Explorer 4.
W EB -B ASED M ANAGEMENT 3-2 Navigating the Web Browser Interface The Bar ricade’ s management interface pro vides access to th e three main menus – Status , Configuration Setting, and Admin Privilege. The fast Setup Wizard is also accessible from the home pag e.
N AVIGATING THE W EB B RO WS E R I NTERFACE 3-3 Making Configuration Changes Configurable parameters hav e a dialog box or a drop-do wn list. Once a configuration change has been made on a page, be sure to clic k on the appropriate button on the pag e to confir m the new setting .
W EB -B ASED M ANAGEMENT 3-4 Menu Overview The W eb manag ement interface allows y ou to define system parameters, manage and control the Bar ricade and its ports, an d monitor network conditions . T he following table briefly describes the selections av ailable from this program.
M ENU O VER VIE W 3-5 Admin Privilege WAN Status Displays the IP address, subnet mask, and MAC address associated with each ATM Virtual Circuit (VC). Provides release/renew IP address option. PPP Status Displays the status of PPP links for each VC. TCP Status Displays the st atus of overall TCP traffic.
W EB -B ASED M ANAGEMENT 3-6 Configuration Settings Use the Configuration menus to access the basic options for W AN and LAN connections, NA T , Virtual Ser ver , Bridge Filtering, and DNS configuration.
C ONFIGURATION S ETTINGS 3-7 Note: Only use values provided by your ISP to configure the WAN link..
W EB -B ASED M ANAGEMENT 3-8 Parameter Default Description System Wide Settings Default Gateway 0.0.0.0 This address is configured by the network administrator and it informs each computer or other ne twork device where t o send data if the target station doe s not reside on the same subnet as th e source.
C ONFIGURATION S ETTINGS 3-9 Asynchronous Transfer Mode (ATM) ADSL provides a reliable connection to y our ser vice provider . T raffic is car ried ov er the ADSL physical link layer using ATM protocol.
W EB -B ASED M ANAGEMENT 3-10 • PPPoA LLC. Point to Point Protocol over ATM Logical Link Control allows multiple protocols running over one virtual circuit (slightly more overhead).
C ONFIGURATION S ETTINGS 3-11 • PPPoE VC-Mux. Point to Point Protocol over Ethernet Virtual Circuit Multiplexer uses PPP to bridge multiprotocol traffic over Ethernet to the ISP’s router. Each PPP connection first learns the Ethernet address of its remote peer, and then es tablishes a unique session identifier.
W EB -B ASED M ANAGEMENT 3-12 LAN This screen is used to configure parameters for the Ether net por t, including local IP address , enabling DHCP ser vic e, and setting the port to a fixe d speed/duplex mode or for auto-negotiation. Parameter Default Description LAN Configuration IP Address 192.
C ONFIGURATION S ETTINGS 3-13 Dynamic Host Configuration Protocol (DHCP) allows hosts on a TCP/IP network to dynamically obtain basic configuration information, including an IP address, network gateway address, and domain name server (DNS) address.
W EB -B ASED M ANAGEMENT 3-14 NAT Configuratio n NA T (Networ k Address T ranslation) and NAPT (Net work Address and P or t T ranslation) conv er t IP addresses on a private netw ork (designated as .
C ONFIGURATION S ETTINGS 3-15 internal IP addresses without affecting outside access to your netw ork. Parameter D efault Descript ion NAT NAPT IP address mappin g between the LA N and WAN. Session Name A name used to identify the stat ic mapping for a specified loca l IP address.
W EB -B ASED M ANAGEMENT 3-16 NAT Session Name Configuration This screen is used to assign a NAT session to a virtual circuit. Parameter Default Description Session Name A name used to identify the stat ic mapping for a specified loca l IP address. Virtual Circuit 0 The permanent vir tual circuit to which this NAT session is assigned.
C ONFIGURATION S ETTINGS 3-17 Virtual Server This scre en is used to redirect remo te users requesting ser vices (e.g ., W eb , FTP) on your local netw ork from the Bar ricade’ s public IP address to internal host ser vers configured with priv ate IP addresses .
W EB -B ASED M ANAGEMENT 3-18 Bridge Filtering T raffic from a node that presents a security risk or is functioning improperly can be filtered from the Bar ricade. This screen is used to filter or forward traffic matching the specified source MA C address , destination MA C address , or Ethernet frame type .
C ONFIGURATION S ETTINGS 3-19 DNS This screen is used to specify the default g ateway and domain name ser vers . Reboot After making any c hang es, reboot the Bar ricade to make the changes effectiv e. Parameter Description DNS Proxy Sele ction Selects a DNS serve r by auto-disco very, user configured, or a combination of bot h methods.
W EB -B ASED M ANAGEMENT 3-20 Admin Privilege Use the Admin Privilege men us to display detailed infor mation on W AN , PPP , and TCP status , or to configur e the static routing table, ADSL connection options , RIP parameters , manag ement passwords , and other advanced features .
A DMIN P RIVILEGE 3-21 PPP Status This screen displays the status of PPP connections configured for any per manent virtual circuit. Use this screen to disconnect or reconnect a PPP link operating on a specified vi rtual circ uit.
W EB -B ASED M ANAGEMENT 3-22 TCP Status This screen displays statistics for all TCP traffic crossing the Bar ricade, as well as general statistics on the number of individual TCP connections .
A DMIN P RIVILEGE 3-23 Route Table This screen is used to manually configure static routes to other IP networks , subnetworks , or hosts . Parameter Description Destination A destination network or specific host to which packets can be routed. Gateway The IP address of the ro uter at the next hop to which matching frames are forwarded.
W EB -B ASED M ANAGEMENT 3-24 Learned MAC Addr. The MAC (Media Access Control) address is Ether net hardware’ s unique identification number . Wh en you're connected to the Internet from y our .
A DMIN P RIVILEGE 3-25 ADSL Configuration This screen is used to configure ADSL connection options for encoding, handshaking, and wiring type. Parameter D efault Descript ion Trellis Enabled An encoding method that limits the impact of line nois e on transm itted signals .
W EB -B ASED M ANAGEMENT 3-26 RIP Configuration This screen is used to configure the dynamic routing protocol used to learn new IP routes. Parameter Default Description RIP Disabled Enabl es/disables dynamic routin g. Supplier True Set this to True if you wan t the Barricade to broadcast routing information as well as accept routing information.
A DMIN P RIVILEGE 3-27 Multicast False This field controls the way in which RIP 2 routing messages are se nt to other routers. Multicast can be set to: True: RIP-2 messages are multicast. False: RIP-2 messages are bro adcast*. Interval 30 The interval at which the ro uter broadcasts routing information (in seconds).
W EB -B ASED M ANAGEMENT 3-28 Password Configuration Administrators hav e Read/W rite access to all configuration parameters and statistics . Y ou should therefore change the default Administrator password as soon as possible, and store it in a safe place.
A DMIN P RIVILEGE 3-29 DHCP relay , IGMP proxy , and allows you to enter SNMP communuty strings ..
W EB -B ASED M ANAGEMENT 3-30 Parameter Default Description WAN side HTTP server Disabled Enables/disables HTTP server ac cess. FTP server Enabled Enables/di sables FTP server access. TFTP server Disabled Enables/disables TFTP server access. HTTP server port 80 Sets the port used for HTTP services.
A DMIN P RIVILEGE 3-31 Other Miscellaneous Functions The Bar ricad e also includes several basic system functions – • Reset to Factory Default – Resets the Barricade settings to the factory defaults. • Diagnostic Test – Tests connection for LAN and ADSL circuits.
W EB -B ASED M ANAGEMENT 3-32 Status The Statu s screen displays core and customer fir mware v ersions and shows the connection status fo r the Bar ricade’ s W AN and LAN ports . . Parameter Description Firmware Info. Software Version System firmware version in ROM.
S TATUS 3-33 Customer Software Version Interface customization version. WAN IP Address The public IP address of the Barricade. Subnet Mask The Subnet Mask of the Barricade. MAC Address The MAC Address of the Barricade. LAN IP Address The internal IP address of t h e Barricade.
W EB -B ASED M ANAGEMENT 3-34 ADSL This screen shows the signal status on the ADSL line..
S TATUS 3-35 Parameter Description ADSL Line State Shows ADSL l i ne status – A ctivation, Training, Channel Analysis, Showtime , or Down. ADSL Startup Attempts The number of times the Barricade has started training the ADSL line for an acceptable sign al rate.
W EB -B ASED M ANAGEMENT 3-36 LAN This screen shows LAN settings for the Barricade and DHCP clients . Parameter Description IP Address The IP address of the local Et hernet port. Valid IP addresses consist of four numbers, 1-254, separated by periods.
4-1 C HAPTER 4 C ONFIGURING C LIENT TCP/IP Windows 95/98/Me Y ou may find that the instr uctions in this chapter do not exactly match your v ersion of Windows . T his is because these steps and screenshots were created from Windows 98. Windo ws 95 and Windows Millennium Edition are similar, but not identical, to Windo ws 98.
C ONFIGURING C LIENT TCP/IP 4-2 2. From “Control P anel” double-click the “Network” icon. 3. In the “Netw ork” window , under the “Configuration” tab , double-click the “TCP/ IP” item listed for your network card. 4. Select the “IP Address” tab .
W INDOWS 95/98/M E 4-3 6. Click the “Gatewa y” tab and record the n umbers listed under “Installed g ateways .” 7. Click the “DNS Configuration” tab . Locate the DNS ser vers listed under “DNS Ser ver Searc h Order .” R ecord any listed addresses .
C ONFIGURING C LIENT TCP/IP 4-4 Step 2. Disable HTTP Proxy Y ou need to verify that the “HTTP Proxy” f e ature of your W eb browser is disabled. This is so that your bro wser can view the configuration pag es for your Barricade. The following steps are for Internet Explorer and Netscape.
W INDOWS 95/98/M E 4-5 Netscape 1. Open Netscape and click the stop button. Clic k “Edit, ” then click “Preferences ...” 2. In the “Prefe rences” window , under “Categ or y” double-click “ Adv anced, ” then click “Proxies .” Select “Direct connection to the Internet.
C ONFIGURING C LIENT TCP/IP 4-6 2. T ype “WINIPCFG” and click “OK. ” It may take a min ute or two for the “IP Configuration” window to appear . 3. From the drop-down men u, select your netw ork card. Click “Release” and then “R ene w .
W INDOWS 2000 4-7 F ollow these instru ctions: 1. From the Windo ws desk top , click the “Star t” button. Click “Set tings, ” and then click “Control P anel. ” 2. Double-click the “Network & Dial-Up Connections” icon. 3. Double-click the icon that corresponds to the connection to your Bar ricade.
C ONFIGURING C LIENT TCP/IP 4-8 5. Double-click “Internet Protocol (TCP/IP). ” 6. All the infor mation you need to record is on the “Internet Protocol (TCP/ IP) Properties” dialog box.
W INDOWS 2000 4-9 Step 2. Disable HTTP Proxy Y ou need to verify that the “HTTP Proxy” feature of y our W eb browser is disabled. This is so that your bro wser can view the configuration pag es for your Barricade. Determine which browser y ou use and refer to “Inter net Explorer” on page 4-4 or “Netscape” on pag e 4-5.
C ONFIGURING C LIENT TCP/IP 4-10 that your IP address is now 192.168.1.xxx , your Subnet Mask is 255.255.255.0 and your Default Ga teway is 192.168.1.1 . These val ues confir m that your ADSL Router is functioning . 4. T ype “EXIT” and press <ENTER> to close the “Command Prompt” window .
W INDOWS NT 4.0 4-11 F ollow these instru ctions: 1. From the Windows desktop click “Start, ” then “Settings , ” and click “Control P anel. ” 2. Double-click the “Network” icon. 3. Select the “Protocols” t ab . 4. Double-click “TCP/IP Prot ocol.
C ONFIGURING C LIENT TCP/IP 4-12 under the IP address tab , locate your IP address , subnet mask, and default g ateway . Record these v a lues in the spaces provided below . 9. Click the “DNS” ta b to see the primar y and secondary DNS ser vers . Record these v alues in the spaces provided below .
W INDOWS NT 4.0 4-13 Step 2. Disable HTTP Proxy Y ou need to verify that the “HTTP Proxy” feature of y our W eb browser is disabled. This is so that your bro wser can view the configuration pag es for your Barricade. Determine which browser y ou use and refer to “Inter net Explorer” on page 4-4 or “Netscape” on pag e 4-5.
C ONFIGURING C LIENT TCP/IP 4-14 3. T ype “IPCONFIG /RENEW” and press the <ENTER> key . V erify that your IP address is now 192.168.1.xxx , your Subnet Mask is 255.255.255.0 and your Default Ga teway is 192.168.1.1 . These val ues confir m that your Bar ricade is functioning .
C ONFIGURING Y OUR M ACINTOSH C OMPUTER 4-15 . F ollow these instru ctions: 1. Pull down the Apple Menu. Click “Control P anels” and select “TCP/IP . ” 2. In the TCP/IP dialog bo x, make sure “Eth er net” is selected in the “Connect via:” field.
C ONFIGURING C LIENT TCP/IP 4-16 Use the space belo w to record the information. 5. After writing do wn your IP settings , select “Using DHCP Ser ver” in the “Config ure” field and close the window . 6. Another bo x will appear asking whether you w ant to sav e your TCP/IP settings .
C ONFIGURING Y OUR M ACINTOSH C OMPUTER 4-17 3. Uncheck all checkbox es and click “OK. ” Netscape 1. Open Netscape and click the s t op button. Click “Edit” and select “Preferences .” 2. In the “Preferences” dialog bo x, in the left-hand column labeled Categ or y , ” se lect “ Advanced.
C ONFIGURING C LIENT TCP/IP 4-18 Step 3. Obtain IP Settings from Your Barricade Now that y ou have configured y our computer to connect to your Bar ricade, it needs to obtain new network settings .
A-1 A PPENDI X A T ROUBLESHOOTING Diagnosing LED Indicators The Bar ricade can be easily monitored through the front panel indicators to identify problems .
T R OUBLESHOOTING A-2 LED Indicators USB Activity or Ethernet Activity LED is Off • Verify that th e Barricade and attached device are powered on. • Be sure the cable is plugged into both the Barricade and correspondin g device. • Verify tha t the proper cabl e type is used and its length does not exceed specifi ed limits.
D IAGNOSING LED I NDICATORS A-3 Network Connection Problems Cannot Ping th e Barricade from the attached LAN, or the router cannot Ping an y device on the atta ched LAN • Verify that IP addresses are properly configured.
T R OUBLESHOOTING A-4.
B-1 A PPENDIX B C ABLES Ethernet Cable Caution: Do NOT plug a phone jack connector into any RJ-45 port. For Ethernet connections, use only twisted-pair cables with RJ-45 connectors that conform to FCC standards. Specifications Wiring Conventions F or Ethernet connections, a twisted-pair cable must ha ve two pairs of wires .
C ABLES B-2 RJ-45 Port The Ether net port on this router uses a crossov er pin ar rangement (MDI-X). Therefore, you can use the crossov er cable provided in the package to connect to the router with your PC . W hen connecting to other network devices such as an Ethernet switch, use the cable type shown in the following table .
RJ-45 P ORT B-3 Straight-Through Wiring If the twisted-pair cable is to join tw o ports and only one of the por ts has an internal crossover (MDI-X), the tw o pairs of wires must be straight-through.
C ABLES B-4 ADSL Cable Use standard telephone cable to connect the RJ-11 tele phone wall outlet to the RJ-11 ADSL port on the ADSL Router . Caution: Do NOT plug a phone jack connector into any RJ-45 port. For Ethernet connections, use only twisted-pair cables with RJ-45 connectors that conform with FCC standards.
C-1 A PPENDI X C S PECIFICATIONS Interface Specifications ADSL Standards Confor mance Basic ADSL: ANSI T1.413 Issue 2 (full rate ADSL), RADSL, ITU G .992.
S PECIFICATIONS C-2 Media T ype Simultaneous data/v oice Media Connection RJ-11 phone wire connection to ADSL provider Ser vice Provider Equipment Digital Subs criber Line Access Mu ltiplexer ( DSLAM) Ethernet Access Method CSMA/CD Standards Confor mance IEEE 802.
P HYS IC AL C HARACTERISTICS C-3 Management System Configuration W eb-based management via HTTP protocol to access embedded management agent Physical Characteristics Por t s 1 RJ-11 ADSL, 1 RJ-45 10/100 Mbps Ethernet Indicator P anel ADSL (TxD , RxD), Ethernet (Speed, Link/Act), P ower , Alar m Dimensions 220 x 133 x 38 mm (8.
S PECIFICATIONS C-4 C-Tick - AS/NZS 3548 (1995) Class B Immunity IEC 1000-4-2/3/4/6 Safety UL 1950 EN60950 (TÜV) CSA 22.2 No . 950 Wa r r a n t y Thre e years.
Glossary-1 A PPENDIX D G LOSSARY 10BASE-T IEEE 802.3 specification for 10 Mbps Ethernet over two pairs of Categ ory 3, 4, or 5 UTP cable. 100BASE-TX IEEE 802.
G LOSSAR Y Glossary-2 Bridging A device that connects tw o LANs, or two segments of the same LAN . Unlike routers , bridg es are protocol-independent. T hey simply forward packets without analyzing and re-routing messag es . Consequently , they may be faster than routers , but are less versatile.
G LOSSAR Y Glossary-3 Dynamic Routing Dynamic routing uses a routing protocol to exc hang e routing infor mation with neighboring routers on the network. It calculates routing tables based on a giv en metric, such as least number of hops or shortest path.
G LOSSAR Y Glossary-4 G.lite A standard that defines the more economical splitterless ADSL connection that transmits data at up to 1.5 Mbps downstream and 512 Kbps upstream. This ADSL option can be installed without an on-site visit by the ser vice provider .
G LOSSAR Y Glossary-5 Media Access Control (MAC) A portion of the netw orking protocol that g ov er ns access to the transmission medium, facilitating the exchange of data between netw ork nodes . Media Dependent Interface (MDI) The IEEE standard for the UTP interface to t wisted-pair Ether net.
G LOSSAR Y Glossary-6 almost arbitrar y number of connections is multiplexed using TCP port infor mation. Password Authentication Protocol (PAP) A basic for m of authentication, in which a user’ s name and password are transmitted ov er a network and compared to a table of name-password pairs .
G LOSSAR Y Glossary-7 Protocol Multiplexing See Multiprotocol Encapsulation Quality of Service (QoS) A network protocol used to specify a guaranteed throughput lev el. T his protocol is often used by ATM pro viders to guarantee their customers a minimum end-to-end latency .
G LOSSAR Y Glossary-8 Routing Routing forwards incoming IP pack ets using statically defined routes or a dynamic routing protocol such as RIP 2. Routing Information Protocol (RIP) A protocol that specifies ho w routers exc hang e routing table infor mation.
G LOSSAR Y Glossary-9 Virtual Host A netw ork device, such as this router, or a ser ver configured to perform Netw ork Address T ranslation (NA T). Virtual Path An A TM network connection betw een two nodes that spans across a series of routers or Layer -3 switches .
G LOSSAR Y Glossary-10.
38 T esla Irvine, CA 92618 Phone: (949) 679-8 000 FOR TECHNICAL SUPPOR T , CALL: From U.S.A. and Canada (2 4 hours a day , 7 days a week) (800) SMC-4-Y OU; (949) 679-80 00; Fax: (949) 67 9-1481 From Europe (8:00 AM - 5:30 PM UK T ime) 44 (0) 118 974 8700; Fa x: 44 (0) 118 974 8701 INTERNET E-mail addresses: techsupport@smc.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il SMC Networks SMC7401BRA è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del SMC Networks SMC7401BRA - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso SMC Networks SMC7401BRA imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul SMC Networks SMC7401BRA ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il SMC Networks SMC7401BRA, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del SMC Networks SMC7401BRA.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il SMC Networks SMC7401BRA. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo SMC Networks SMC7401BRA insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
