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SMC2585W-G and another wireless device. 

„

 

STA-AP. 

This type of wireless link is specified in the IEEE 802.11 standard for 

communication between an IEEE 802.11 Station (STA) and an IEEE 802.11 Ac-
cess Point (AP). An STA is usually a client computer (PC or PDA) with a WLAN 
network interface card (NIC).

 

„

 

WDS. 

This type of wireless link is specified in the IEEE 802.11 standard for com-

munication between two IEEE 802.11 APs. Wireless packets transmitted along the 
WDS link comply with the IEEE 802.11 WDS (Wireless Distribution System) format 
at the link layer.

 

The relationships among the operational modes and the wireless link types are shown in the 
following table: 

3.3.2. Changing Password 

 

Fig. 23. Password. 

On this page, you can change the user name and password for the rights to modify the con-
figuration of the SMC2585W-G. The new password must be typed twice for confirmation. 

3.3.3. Managing Firmware 

 

Fig. 24. Firmware management protocol setting. 

Firmware management operations for the SMC2585W-G include firmware upgrade, con-
figuration backup, configuration restore, and configuration reset. Firmware upgrade, con-
figuration backup, and configuration restore can be achieved via HTTP or TFTP. The 
HTTP-based way is suggested because it’s more user-friendly. However, due to different 
behavior of different Web browser types and versions, HTTP-based firmware management 
operations may not work properly with some Web browsers. If you cannot successfully per-
form HTTP-based firmware management operations with your Web browser, try the 
TFTP-based method. 

3.3.3.1. Upgrading Firmware by HTTP 

 

Fig. 25. Firmware upgrade by HTTP. 

Summary of Contents for 2585W-G FICHE

Page 1: ......

Page 2: ...SMC2585W G EliteConnect 2 4GHz dual radio 802 11g Wireless Bridge User s Guide Version 1 0 Draft 2 Last Updated 10 03 2005 ...

Page 3: ...ts use No license is granted by implication or otherwise under any patent or patent rights of SMC SMC reserves the right to change specifications at any time without notice Copyright 2004 by SMC Networks Inc 38 Tesla Irvine California 92618 All rights reserved Trademarks SMC is a registered trademark and EliteConnect is a trademark of SMC Networks Other product and company names are trademarks or ...

Page 4: ...ncorporates these newer technologies At that point the obsolete product is discontinued and is no longer an Active SMC product A list of discontinued products with their respective dates of discontinuance can be found at http www smc com index cfm action customer_service_warranty All products that are replaced become the property of SMC Replacement products may be either new or reconditioned Any r...

Page 5: ...CIDENT FIRE LIGHTNING OR OTHER HAZARD LIMITATION OF LIABILITY IN NO EVENT WHETHER BASED IN CONTRACT OR TORT INCLUDING NEGLIGENCE SHALL SMC BE LIABLE FOR INCIDENTAL CONSEQUENTIAL INDIRECT SPECIAL OR PUNITIVE DAMAGES OF ANY KIND OR FOR LOSS OF REVENUE LOSS OF BUSINESS OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE INSTALLATION MAINTENANCE USE PERFORMANCE FAILURE OR INTERRUPTIO...

Page 6: ...ued compliance example use only shielded interface ca bles when connecting to computer or peripheral devices Any changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate this equipment This transmitter must not be co located or operating in conjunction with any other antenna or transmitter FCC Radiation Exposure Statement Th...

Page 7: ...ing antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help FCC Caution To assure continued compliance any changes or modifications not expressly approved by the party responsible for compliance could void the user s a...

Page 8: ...g des Gerätes ist auf sicheren Stand zu achten Ein Kippen oder Fallen könnte Beschädigungen hervorrufen 7 Die Belüftungsöffnungen dienen der Luftzirkulation die das Gerät vor Überhitzung schützt Sorgen Sie dafür daß diese Öffnungen nicht abgedeckt werden 8 Beachten Sie beim Anschluß an das Stromnetz die Anschlußwerte 9 Verlegen Sie die Netzanschlußleitung so daß niemand darüber fallen kann Es soll...

Page 9: ...Wenn das Gerät deutliche Anzeichen eines Defektes aufweist 15 Stellen Sie sicher daß die Stromversorgung dieses Gerätes nach der EN 60950 geprüft ist Ausgangswerte der Stromversorgung sollten die Werte von AC 7 5 8V 50 60Hz nicht über oder unterschreiten sowie den minimalen Strom von 1A nicht unterschreiten Der arbeitsplatzbezogene Schalldruckpegel nach DIN 45 635 Teil 1000 beträgt 70dB A oder wen...

Page 10: ...3 2 1 Associated Wireless Clients 18 3 2 2 Current DHCP Mappings 19 3 2 3 System Log 19 3 3 General Operations 20 3 3 1 Selecting an Operational Mode 20 3 3 2 Changing Password 21 3 3 3 Managing Firmware 21 3 3 3 1 Upgrading Firmware by HTTP 21 3 3 3 2 Backing up and Restoring Configuration Settings by HTTP 22 3 3 3 3 Upgrading Firmware by TFTP 22 3 3 3 4 Backing up and Restoring Configuration Set...

Page 11: ... 3 6 2 4 SNMP 40 Appendix A Default Settings 41 Appendix B Troubleshooting 42 B 1 Wireless Settings Problems 42 B 2 TCP IP Settings Problems 43 B 3 Other Problems 44 Appendix C Distances and Data Rates 46 Appendix D Technical Specifications 47 D 1 SMC2585W G Wireless Bridge 47 D 2 SMCPWR INJ3 Power Injector 49 ...

Page 12: ...clients than a normal AP 64 bit and 128 bit WEP Wired Equivalent Privacy For wireless data encryp tion IEEE 802 1x RADIUS When the SMC2585W G is in Access Point mode it can be configured to authenticate wireless users and distribute encryption keys dynami cally by IEEE 802 1x Port Based Network Access Control and RADIUS Remote Authentication Dial In User Service WPA Wi Fi Protected Access The SMC2...

Page 13: ...2585W G can automatically obtain an IP address from a DHCP server z DHCP server The SMC2585W G can automatically assign IP addresses to computers or other devices by DHCP Dynamic Host Configuration Protocol Static DHCP mappings The administrator can specify static IP address to MAC address mappings so that the specified IP addresses are always assigned to the hosts with the specified MAC addresses...

Page 14: ...are logged to the on board RAM of the SMC2585W G and can be viewed using a Web browser Remote log by SNMP trap Systems events are sent in the form of SNMP traps to a remote SNMP management server Remote log by BSD Syslog Systems events are sent in the form of BSD Syslog RFC3164 to a remote Syslog server z Power over Ethernet Supplying power to an SMC2585W G over an Ethernet cable using optional SM...

Page 15: ...indicators on the SMC2585W G They are defined as follows z ALV Alive Blinks when the SMC2585W G is working normally z RF1 IEEE 802 11b g interface activity z RF2 IEEE 802 11b g interface activity z LAN Ethernet LAN interface activity z PWR Power ...

Page 16: ...er supplied by a Listed Power Unit marked Class 2 or LPS and output rated 12V DC 1 25 A minimum or equivalent statement To power the SMC2585W G by SMCPWR INJ3 Power Injector 1 Connect the power cord cable from power outlet to the SMCPWR INJ3 power connec tor To Power Outlet Fig 1 Connecting the power cord cable to SMCPWR INJ3 2 Check the POWER LED if system is normal the LED will be on Green light...

Page 17: ...W G EliteConnect 2 4GHz 11Mbps Wireless Bridge The use of SMCPWR INJ3 with other Ethernet ready devices that are not compliant to IEEE 802 3af may cause damage to the devices 2 2 Mounting the SMC2585W G on a Wall The SMC2585W G is wall mountable 1 Stick the supplied sticker for wall mounting 2 Use a φ7 0mm driller to drill a 25mm deep hole at each of the cross marks 3 Plug in a supplied plastic co...

Page 18: ...W G click the menu item File click Preferences click File types and edit the MIME type text html to add a file extension sht so that Opera can work properly with the Web management pages of the SMC2585W G Since the configuration management protocol is HTTP based you have to make sure that the IP address of the managing computer and the IP address of the managed SMC2585W G are in the same IP subnet...

Page 19: ... the same IP subnet Set the IP address of the computer to 192 168 2 xxx Default IP address is set to DHCP client it will default to 192 168 2 50 if there is no DHCP server present TIP You can use SMC2585W G Scan Utility on the CD ROM to scan for all the SMC2585W Gs on the network Double click a scanned SMC2585W G to launch the Web browser to manage the SMC2585W G Note that this utility does not di...

Page 20: ...name and password For first time configuration use the default user name admin and default password smcadmin respectively And then click Log On Fig 5 Entering the user name and password NOTE It is strongly recommended that the password be changed to other value for security reasons On the start page click the General Password link to change the value of the password see Section 3 3 1 for more info...

Page 21: ... interface and the other is configured as an AP client based dynamic bridge Interface Dual AP In this mode both WLAN interfaces are configured as AP interfaces The dual AP can handle twice the number of wireless clients than a normal AP In any mode the SMC2585W G forwards packets between its Ethernet interface and wireless interface for wired hosts on the Ethernet side and wireless host s on the w...

Page 22: ... appropriately so that they comply with your LAN environment In addition you can specify the Host name and Domain DNS suffix of the SMC2585W G When you are finished click Save at the bottom of this page and then you are brought back to the start page Step 3 Configuring IEEE 802 11 Settings Fig 9 IEEE 802 11g communication settings Go to the IEEE 802 11 Communication section to configure IEEE 802 1...

Page 23: ... AP or bridge at the other end of the WDS link 2 Select the corresponding Enabled check box For example assume you want two SMC2585W Gs with MAC addresses 00 02 65 01 62 C5 and 00 02 65 01 62 C6 to establish a WDS link between them On SMC2585W G 00 02 65 01 62 C5 set the peer MAC address of port 1 to 00 02 65 01 62 C6 and on SMC2585W G 00 02 65 01 62 C6 set the peer MAC address of port 1 to 00 02 ...

Page 24: ...r network topology consist of wireless bridges Ethernet switches Ethernet links and WDS links that form a loop If there are any loops that exist packets will circle around the loops and network performance will be seriously degraded Fig 12 Network topology containing a loop ...

Page 25: ...ou do not click the Log Off button or have not interacted with the Web management interface for a period of time specified by the Web admin idle timeout setting 5 minutes by default you ll be automatically logged off by the device 2 5 Deploying the SMC2585W G After the settings have been configured deploy the SMC2585W G to the field application environment Connect the SMC2585W G to an Ethernet LAN...

Page 26: ...omputer 5 Fine tune the alignment of the antenna until you get the best response time 6 Increase the data rate of each SMC2585W G simultaneously until an optimal workable data rate is reached You may not be able to use the highest data rate 54Mbps be cause of the distance and the gain of the antennas Fig 14 illustrates the idea Fig 14 Adjusting alignments of external directional antennas ...

Page 27: ...ormation Wireless Clients The status of the wireless clients currently associated with the SMC2585W G DHCP Mappings Current IP MAC address mappings of the built in DHCP server System Log System events log z General Global operations Operational Mode Operational mode settings Password For gaining rights to change the settings of the SMC2585W G Firmware Tools For upgrading the firmware of the SMC258...

Page 28: ...P settings 3 1 2 Save Save Restart and Cancel Commands Fig 16 Save Save Restart and Cancel There are three buttons Save Save Restart and Cancel at the bottom of each page Clicking Save stores the settings changes to the memory of the SMC2585W G and brings you back to the start page Clicking Save Restart stores the settings changes to the memory of the SMC2585W G and restarts the SMC2585W G immedia...

Page 29: ... Home brings you back to the start page Clicking Re fresh updates the shown status information 3 2 Viewing Status 3 2 1 Associated Wireless Clients Fig 19 Status of associated wireless clients On this page the status information of each associated client including its MAC address IP address user name number of bytes it has send number of bytes it has received and the time of its last activity is s...

Page 30: ... obtains the specified IP address from the DHCP server You can set static DHCP mappings in the Static DHCP Mappings section of the DHCP Server configuration page see Section 3 4 2 A dynamic mapping indicates that the DHCP server chooses an IP address from the IP address pool from the DHCP Server configuration page 3 2 3 System Log Fig 21 System log System events are recorded in the memory of the S...

Page 31: ...n AP interface and the other is configured as a LAN to LAN bridge interface Dynamic AP Repeater In this mode one WLAN interface is configured as an AP interface and the other is configured as an AP client based dynamic bridge Interface Dual AP In this mode both WLAN interfaces are configured as AP interfaces The dual AP can handle twice the number of wireless clients than a normal AP In any mode t...

Page 32: ...his page you can change the user name and password for the rights to modify the con figuration of the SMC2585W G The new password must be typed twice for confirmation 3 3 3 Managing Firmware Fig 24 Firmware management protocol setting Firmware management operations for the SMC2585W G include firmware upgrade con figuration backup configuration restore and configuration reset Firmware upgrade con f...

Page 33: ...e configuration file is to be stored And then click Save NOTE The procedure may be a little different with different Web browsers Fig 27 Configuration restore by HTTP To restore configuration of the SMC2585W G by HTTP 1 Click Browse and then select a correct configuration hex file You have to make sure the file name is the SMC2585W G_Backup hex The file path will be shown in the Con figuration fil...

Page 34: ...the upgrade process 2 Connect the computer and one of the LAN Ethernet switch port with a standard Ethernet cable 3 Configure the IP address of the computer so that the SMC2585W G and the computer are in the same IP subnet 4 Run the TFTP Server utility on the computer Specify the folder in which the firmware files reside 5 On the computer run a Web browser and click the General Firmware Tools hype...

Page 35: ... by Ethernet and on the same LAN NOTE After the firmware is upgraded be sure to delete the contents of the Web browser cache so that the Web management pages can be shown correctly NOTE A failed upgrade may corrupt the firmware and cause the SMC2585W G to not be restarted When this occurs call for technical support TIP If you want to remotely upgrade the firmware of a deployed SMC2585W G from the ...

Page 36: ...d SMC2585W G_Backup NOTE Remember to select the Accept write requests check box of TFTP Server To restore configuration of the SMC2585W G by TFTP 1 Use a computer that will serve as a TFTP server and as a managing computer to trig ger the restoring process 2 Connect the computer and one of the LAN Ethernet switch port with a standard Ethernet cable 3 Configure the IP address of the computer so tha...

Page 37: ... Click on the Reset button to reset the device configuration to factory defaults 3 4 Configuring TCP IP Related Settings 3 4 1 Addressing Fig 33 TCP IP settings The IP address of the SMC2585W G can be manually set Set Manually or automatically assigned by a DHCP server on the LAN Obtain from a DHCP Server enabled by de fault If you are manually setting the IP address Subnet mask and Default gatewa...

Page 38: ...ses NOTE There should be only one DHCP server on the LAN otherwise DHCP would not work properly If there is a DHCP server on the LAN already disable the DHCP server func tionality of the SMC2585W G NOTE By default the DHCP server function is disabled 3 4 2 2 Static DHCP Mappings Fig 35 Static DHCP mappings IP addresses of servers are often static so that clients could always locate the servers by ...

Page 39: ...11b compatible you can configure the Policy setting to meet your backwards compatibility needs If the SMC2585W G is used in an environment in which all wireless clients are IEEE 802 11b based set Policy to b only If all the wireless clients are IEEE 802 11g based set Policy to g only For maximal flexibility set Policy to Mixed in which mode the SMC2585W G supports both IEEE 802 11b and IEEE 802 11...

Page 40: ... the IP address specified in Reference host 3 5 1 3 Wireless Distribution System LAN AP 2 Notebook Computer AP 1 WDS Fig 38 Wireless Distribution System Traditionally access points are connected by Ethernet By IEEE 802 11 Wireless Distribution System WDS APs can communicate with one another wirelessly For example in Fig 38 AP 2 acts as an access point for the notebook computers and it forwards pac...

Page 41: ...AP or bridge at the other end of the WDS link 4 Select the corresponding Enabled check box For example assume you want two SMC2585W Gs with MAC addresses 00 02 65 01 62 C5 and 00 02 65 01 62 C6 to establish a WDS link between them On SMC2585W G 00 02 65 01 62 C5 set the peer MAC address of port 1 to 00 02 65 01 62 C6 and on SMC2585W G 00 02 65 01 62 C6 set the peer MAC address of port 1 to 00 02 6...

Page 42: ... WDS links that form a loop If there are any loops that exist packets will circle around the loops and network performance will be seriously degraded Fig 42 Network topology containing a loop 3 5 2 Security IEEE 802 11b g security settings include SSID broadcasts Security mode IEEE 802 11 Authentication algorithm WEP keys MAC Address Based Access Control ...

Page 43: ...the STAs cannot see each other This feature is useful for WLANs deployed in public places This way hackers have no chance to attack other wireless users in a hotspot When the Wireless client isolation setting is set to This AP Only wireless clients STAs associated to this SMC2585W G which acts as an AP cannot see each other and wire less to wireless traffic between the STAs is blocked When the set...

Page 44: ... Only TKIP Temporal Key Integrity Protocol mechanism of WPA Wi Fi Protected Access is enabled In this mode you have to specify the Pre shared key which will be used by the TKIP engine as a master key to generate keys that actually encrypt outgoing packets and decrypt incoming packets NOTE The number of characters of the Pre shared key setting must be at least 8 and can be up to 63 z IEEE 802 1x EA...

Page 45: ... to the remote device side All 4 WEP keys are used as receive keys to decrypt traffic from the remote device side to the local device side NOTE Each field of a WEP key setting is a hex decimal number from 0 9 A F For exam ple when the security mode is Static WEP and the key length is 64 Bits you could set Key 1 to 00012E3ADF 3 5 2 2 MAC Address Based Access Control Fig 46 MAC address based access ...

Page 46: ...4 Fig 47 MAC ACL download settings Instead of manually entering MAC addresses to the access control table one by one you can prepare a text file that contains all the MAC addresses and put it on a TFTP server and then download the MAC ACL Access Control List file from the TFTP server to the SMC2585W G Fig 48 shows the contents of a sample ACL file Fig 48 Sample MAC ACL file To download a MAC ACL f...

Page 47: ...tion mecha nisms EAP MD5 Message Digest version 5 EAP TLS Transport Layer Security If EAP MD5 is used the user has to give his or her user name and password for authentica tion If EAP TLS is used the wireless client computer automatically gives the user s digital certificate that is stored in the computer hard disk or a smart card for authentication And af ter a successful EAP TLS authentication a...

Page 48: ...yer 4 TCP UDP Port Filters filtering capabilities The configuration processes for the fil ters are similar Functionality whether this filtering capability is enabled or disabled Policy for matched packets how a matched packet is processed discard or pass To enable a filtering rule select the check box to the left of the rule 3 6 1 1 Ethernet Type Filters Fig 51 Ethernet type filters settings The E...

Page 49: ...s range is determined by performing an AND operation on the source destination IP address field and the source destination subnet mask field For example if the source IP address field is 192 168 0 1 and the source subnet mask field is 255 255 255 0 the result source IP address range is 192 168 0 0 to 192 168 0 255 3 6 1 3 TCP UDP Port Filters Fig 53 TCP UDP port filters settings The destination po...

Page 50: ...3 6 2 2 UPnP Fig 55 UPnP settings UPnP Universal Plug and Play enables a Windows XP user to automatically discover pe ripheral devices When the UPnP functionality is enabled you can see the SMC2585W G in My Network Places of Windows XP The SMC2585W G can be given a user friendly name that will be shown in My Network Places Double clicking the icon in My Network Places that refers to the SMC2585W G...

Page 51: ...raps Cold Start Warm Start Link Up Link Down and SNMP Authentica tion Failure NOTE The SNMP Authentication Failure trap is issued when using an incorrect community string to manage the SMC2585W G via SNMP and the SNMP MIB II OID snmpEnableAu thenTraps is enabled disabled by default 3 6 2 4 SNMP Fig 57 SNMP settings The SNMP Simple Network Management Protocol functionality can be disabled and you c...

Page 52: ...ng of the SMC2585W G Security Mode Open System WEP Key Length 64 Bits Selected WEP Key Key 1 WEP Key 1 00 00 00 00 00 WEP Key 2 00 00 00 00 00 WEP Key 3 00 00 00 00 00 WEP Key 4 00 00 00 00 00 MAC Address Based Access Control Disabled Access Control Table Type Inclusive Wireless Client Isolation Disabled Link Integrity Disabled LAN Interface Method of obtaining an IP Address DHCP Client enabled IP...

Page 53: ...B 1 Wireless Settings Problems z The wireless client computer cannot associate with an SMC2585W G Is the wireless client set in infrastructure mode Check the operating mode of the WLAN NIC Is the SSID of the WLAN NIC identical to that of the prospective SMC2585W G Check the SSID setting of the WLAN NIC and of the SMC2585W G Is the WEP functionality of the prospective SMC2585W G enabled Make approp...

Page 54: ...NS reply it knows the IP address of the correspondent host and sends further packets to this IP address As illustrated in Fig 58 the communication path could be broken at some of the stages The OS provided network diagnostic tool ping exe can be employed to find out TCP IP related communication problems NOTE If two or more NICs are installed and operating on a client computer TCP IP may not work p...

Page 55: ...really down or there are other communication problems on the network backbone z The DNS server s of the client computer do not respond to ping from the client computer Solve the preceding problems first If you cannot find any incorrect settings of the SMC2585W G the default gateway of the SMC2585W G may be really down or there are other communication prob lems on the network backbone B 3 Other Pro...

Page 56: ...he power jack and then re plug the con nector to restart the SMC2585W G Contact our technical support representatives to report this problem If this happens after a failed firmware upgrade process the firmware of the SMC2585W G may have been corrupted If the SMC2585W G still does not work after restarting there may be hardware component failures in the SMC2585W G Contact our technical support repr...

Page 57: ...s on the web at www smc com or you can call us toll free at 800 SMC 4YOU SMC Networks stands behind this and every product we sell with a 30 day satisfaction guarantee and with a limited lifetime warranty 802 11g Wireless Distance Table Environmental Condition Speed and Distance Ranges 54 Mbps 48 Mbps 36 Mbps 24 Mbps 18 Mbps 12 Mbps 6 9 Mbps Outdoors A line of sight environment with no interferenc...

Page 58: ...11 FCC Canada 1 11 IC Europe 1 13 ETSI France 10 13 Japan 1 13 Japan Frequency range 2 402 2 472 GHz North America 2 402 2 4970 GHz Japan 2 402 2 4835 GHz Europe ETSI 2 4465 2 4835 GHz France Transmission output Power 18 dBm max Receiving Sensitivity 80 dBm Typical Antenna Removable Antenna with R SMA connector Operational Modes Bridge Repeater AP Repeater Dual AP Interface 10 100 Mbps RJ 45 Conne...

Page 59: ... Syslog Event Logging LEDs Power LAN RF 1 RF 2 Alive Environmental Temperature Operating 0 55C storage 20 70C Humidity 5 to 95 non condensing in storage Electromagnetic Compatibility FCC Class B Industry Canada CE ETS 300 328 ETS 300 826 Power Supply Input 100VAC 60Hz Output 12VDC 1A Dimensions without antenna 8 5 x 5 5 x 1 25 Weight 0 96 lbs ...

Page 60: ...ators System Indicator AC Power Green Power Active Red 0 05 A Io 0 8 A Over Current Protection Red Flash Io 1 0 A Connectors Shielded Rj 45 Environmental Conditions Operating Temperature 32 to 104 F 0 to 40 C Operating Humidity Maximum 90 Non condensing Storage Temperature 13 to 185 F 25 to 85 C Storage Humidity Maximum 95 Non condensing Operating Altitude 1000 to 10 000 ft 304 8 to 3048 m Safety ...

Page 61: ... incorporates these newer technologies At that point the obsolete product is discontinued and is no longer an Active SMC product A list of discontinued products with their respective dates of discontinuance can be found at http www smc com index cfm action customer_service_warranty All products that are replaced become the property of SMC Replacement products may be either new or reconditioned Any...

Page 62: ...08602 Fax 39 02 739 14 17 Benelux 31 33 455 72 88 Fax 31 33 455 73 30 Central Europe 49 0 89 92861 0 Fax 49 0 89 92861 230 Nordic 46 0 868 70700 Fax 46 0 887 62 62 Eastern Europe 34 93 477 4920 Fax 34 93 477 3774 Sub Saharan Africa 216 712 36616 Fax 216 71751415 North West Africa 34 93 477 4920 Fax 34 93 477 3774 CIS 7 095 7893573 Fax 7 095 789 357 PRC 86 10 6235 4958 Fax 86 10 6235 4962 Taiwan 88...

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