Benutzeranleitung / Produktwartung ENH500 des Produzenten EnGenius
Zur Seite of 88
WIRELESS A C CESS POINT / CLIENT BRIDGE Model: ENH500 User Manual V ersio n: 1.0 4Gon www.4Gon.co.uk info@4gon.co.uk Tel: +44 (0)1245 808295 Fax: +44 (0)1245 808299.
T able o f Content s 1 PRODUCT OVERVIEW ........... .............. .............. .............. .............. .............. .............. .............. ............... .............. .............. . 6 1.1 F EA TURES ....... .............. ..
7.1.3 WDS Bridge M ode ................... .............. .............. .............. .............. .............. .............. .............. .......... ......... .. .. 35 7.1.4 Client R outer Mode .............. .............. .............
11.4 C LIENT R OUTER M ODE .......... .............. .............. .............. .............. .............. .............. .............. .............. ..... .. ............ .... 74 APPENDIX A – TROUBLE SHOO TING .............. ...........
About This D ocument Th i s d o c u m en t i s w r i t t en b y E n G en i u s I n c. E n G en i u s I n c. th e r es e r ve s t h e r i g ht t o c ha n g e t h i s document without notice and all right s are re se rv e d . T h i s d o c u me n t c a n only be used for the conf iguration of EnG enius product s.
1 Product Overvi ew Thank you for using the ENH500. It is a powerful and enhanced business-class pr oduct with 4 multi-functions: Access P oint, Clie nt Bridge, WDS, and Client R outer . EnG enius’ E NH500 uses the latest wireless standa rd, 802.11n, which allo ws for faster wireless throughput.
d) Frequently altered environments Show r ooms, meeting r ooms, r et ail st or es, and manufacturing sites are prime examples where frequently r earranged workplaces are suited for wireless L ANs.
1.2 Benef its Access Point Mode Use this feature to setup the access point’ s conf iguration information. It supports transmit power and channel adjustment s. Clients can ac cess the network with differ ent regulato r y settings and automat ically change to the local r egulations.
1.3 P ackage Content s Open the package car efully , and make sur e that none of the it ems listed below ar e missing. Do not discar d the packing materials; in ca se of r eturn, the unit must be shipped in it s original pac ka gi ng . (1) Wireless Access Point / Client Bridge (ENH 500) (1) 24V/1.
1.6 Understanding the ENH500 LEDs The rear o f the ENH500 has two grou ps o f LEDs. One group, labeled INDICA T O RS , shows the status o f the device. The second group, LINK QU ALITY , shows the strength of the link between the ENH500 and the network .
2 Installation This chapter describes how to install the ENH500. Only experienced installation pro fessional s who are familiar with local building and safety codes and, wher ever applicable, are lic en sed by the appropriate gov ernment regulator y authorities should install the ENH500.
6. Turn over the ENH50 0. Then insert the ma st strap through the middle hole of the ENH500. Use a s crewdriver to unlock the po le-mounting ring putting it th rough the ENH500. 7. Mount the ENH500 securely to the po le by locking the strap tightly. This completes the in stallation procedure.
client s that suppor t the IEEE 802.11a/n st andard s. S tations and client s mus t utilize the same SSID and Security P assword to a ssociate while wi thin range.
Not ever y Access Point suppor ts WDS in Access P oint Mode. It is recommended to use ENH500s if you would like to utilize this functionalit y . 3.3 Client Bridge Mode In the Client Bridge Mode, the ENH500 functi ons lik e a wir eless client, connecting t o an Access P oint wirelessly and enabling Internet co nnectivity wher ever you want.
3.4 WDS Bridge M ode In the WDS Bridge Mode, the ENH500 can wirelessl y connect different local area networks by conf iguring each device’ s MAC addr ess and se curity set tings. The WDS Bridge Mode can bridge up to four local wired networks together as one l ogical network .
WDS Bridge Mode is un like Access P o int Mode. APs linked by WDS are using the same wireless channel, and connecti ng excessive numbers o f APs on the same channel may result in lower throug hput. Please be aware to avoid loop connections; other wise enable the Spanning T ree Function.
4Gon www.4Gon.co.uk info@4gon.co.uk Tel: +44 (0)1245 808295 Fax: +44 (0)1245 808299.
4 Configuring Your C omputer for TCP/ IP This chapter describes how to conf igure the T CP/IP set tin gs on a computer that will be used to conf igure the ENH500. Because the default oper ating mode is Client Bridge, an IP address will not be assigned to the computer/notebook .
3. In the Networking tab, click Internet Protocol V ersion 4 (T CP/IPv4) , and then click Prope r ties . 4. In the properties dialog box, click Use the following IP address: to configure your computer for Static TCP/IP. Enter an IP address (i.e. 1 92.
4.2 Conf iguring Microso ft W indows V ista Use the following procedure to configure a computer running Microsoft Windows Vista with the default Windows interface. 1. On the Windows taskbar, click Start , click Control Panel , and then sele ct the Network and In ternet icon .
6. In the properties dialog box, click Use the following IP address: to configure your computer for Static TCP/IP. Enter an IP address (i.e. 1 92.168.1.10), the subnet mask of the ENH500, and the default gateway which is the ENH 500’s IP address, 19 2.
1. On the Windows taskbar, click Start , click Control Panel , and then click Network and Internet Connections . 2. Click the Network Connections icon. 3. Click Local Area Connection for the Ethernet adapter connected to the ENH500. The Local Area Connection S tatus dialog box appears.
1. Pull down the Apple Menu, click Sys tem Preferences , and s elec t Network . 2. Verify that the NIC connected to the ENH500 is selected in the Show field. 3. In the Configure field on the TCP/IP tab, select Manually . 4. Click Apply Now to apply your settings and cl ose the TCP/IP dialog box.
1. Open your web browser . 2. Enter IP 192.168.1.1 into your address bar . If you have changed the EN H500 L AN IP address, mak e sure you enter the correct IP Address. 3. After successfully connecting to the ENH500, a browser pop-up with a W indows Security notice will appear .
5 Status The Status section is on the navigation drop-down menu. Selecting it, yo u will then see three options: Main, Wireless Client List, and System Log. Each option is described i n detail below. 5.1 Save / Load This page allows viewing o f the modif ied settings.
5.2 Main Cli ck on the Main link under the Stat us drop-down menu or click Home fr om the top-right of the webpage. The status that is displayed corresponds with the operating mode that is selected.
5.3 W i reless Client List Cli ck on the Wireless Client List link under the Status drop-dow n menu. This page displays the list of Clients that are associated to the ENH500. The MAC addr esses and signal strength for each client is displayed. Click on the Refresh button to refresh the client list.
5.5 Connection S tatus Cli ck on the Connection Status link under the St atus drop-down menu. This page displays the current status of the netw ork, including Network Type, SSID, BSSID, Conn ection Status, Wireless Mode, Current Channel, Security, Data Ra te, Current noise level, and Signal strength.
6 System 6.1 Swit ching the Operation M ode The ENH500 suppor ts 4 modes: Access P oint, C lient Bridge, WDS Bridge, and Client R outer . In order t o switch be tween the operating modes, please go to System -> Operation mode. To b e g i n , c l i c k Sys t em P ro p er t ie s under S ystem Section.
7 Wireless Configuratio n This section will guide yo u through all o f the wireless settings. Please re ad the instructions carefully . Inappropriate settings could lower the perf ormance or affect the stability o f your network . Before conti nuing, please make sur e you have chosen the correct operating mode.
W ireless Mode The wireles s mode sup por ts 802. 11a/n mixed ope ration. It is compatible with the most common wireless b ands. Channel HT Mode The default channel bandwidth is 40 MHz. A l arger channel can provide be tter transmit quality and speed.
SSID Specify the SSID for current pr of ile. VLAN ID Specify the VL AN tag for curr ent pro f ile. Suppressed SSID Place a c heck to hide the SSID . Clients will not be able to see the bro adca st SSID in Site Sur vey . Sta t i o n S e p ar a t i o n Select the Radio button to allo w / deny clients t o com municate with one another .
7.1.2 Client Bridge Mode W ireless Mode The wireles s mode sup por ts 802. 11a/n mixed ope ration. It is compatible with the most common known wireless b ands. SSID Specify the SSID if known. The SSID text bo x will be automatically f illed in when an AP in the Site Sur vey is selected.
Prof ile Af ter Site Sur v ey , the web page w ill dis pl ay a ll of t he n earb y Access P oints. Click the BSSID if you wo uld like t o connect with it. W ireless Securi ty Please r efer to the W ireless Security section. Re f r es h Press R efresh to scan again.
7.1.3 WDS Bridge Mode W ireless Mode The wireles s mode sup por ts 80 2.11a/n mixed modes. It is compatible with the most common wireless b ands. Channel HT Mode The default channel bandwidth is 40 MHz. A l arger channel can provide be tter transmit quality and speed.
MAC Address Enter the Acce ss P oint’ s MAC a ddress that you w ould like to extend the wir eless coverage o f into the MAC a ddress f ilter . Mode Select Disable or Ena ble from the drop down lis t. Accep t / Can cel Press Accept to conf irm the change s or Cancel to retu rn to th e previous settings.
7 . 1.4 Client R outer Mode W ireless Mode The wireles s mode sup por ts 802. 11a/n mixed ope ration. It is compatible with the most common wireless b ands. SSID Specify the SSID , if known. The SSID text box will be aut omatically f illed in if an AP in the Site Sur vey is selected.
Prof ile After Site Sur vey , the webpage will display all nearby Access P oint s. Click the BSSID if you would like to connect with an AP . W ireless Securi ty Please r efer to the W ireless Security section. Re f r es h Press Ref r e sh to scan again.
7.2 W ireless Security Settings W ireless Security Settings sect ion will guide you thr ough the Security conf igurations: WEP , WP A-PSK , WP A2-PSK, WP A-PSK Mix ed, WP A, WP A2, and WP A Mixed. W e s trongly reco mmend the use of WP A2-PSK as your security setting.
7.2.2 WP A-PSK Security Mode Select WP A-P SK from the dr op down list. Encr yption Select Both , TKIP or AES for encr yption type. Pas s p h r a s e Specif y the security passwor d. Group Key Update Inter val Spe cif y Grou p Key U pd ate In ter val ti me.
7.2.3 WP A2-PSK Security Mode Select WP A2-P SK from the drop down list. Encr yption Select Both , TKIP or AES for encr yption type. Pas s p h r a s e Specif y the security passwor d. Group Key Update Inter val Spe cif y Grou p Key U pd ate In ter val ti me.
7.2.4 WP A-PSK Mixed Security Mode Select WP A-P SK Mixed fr om the drop down list. Encr yption Select Both , TKIP or AES for encr yption type. Pas s p h r a s e Specif y the security passwor d. Group Key Update Inter val Spe cif y Grou p Key U pd ate In ter val ti me.
7.2.5 WP A Security Mode Select WP A fr om the drop down list. Encr yption Select Both , TKIP or AES for Encryp tion type. Radius Se r ver Specify Radius Ser ver IP address. Radius P or t Specif y Radius P ort number , the default por t is 1812. Radius Secret Specif y Radius Secret that is given by the Radius Ser ver .
7.2.6 WP A2 Security Mode Select WP A2 fr om the drop down list. Encr yption Select Both , TKIP or AES for encr yption type. Radius Se r ver Specify Radius Ser ver IP Address. Radius P or t Specif y Radius P ort number , the default por t is 1812. Radius Secret Specif y Radius Secret that is given by the Radius Ser ver .
7.2.7 WP A Mixed Security Mode Select WP A Mi xed from the dr op down list. Encr yption Select Both , TKIP or AES for encr yption type. Radius Se r ver Specify Radius Ser ver IP Address. Radius P or t Specif y Radius P ort number , the default por t is 1812.
7.3 W i reless Adv anced Set tings Data Ra te Select Data Rate from the drop down list. Data rate will affect the eff iciency of the thr oughput. A lower dat a rate will allow for transmissions to travel longer distances. Tr a n s m i t P o w e r Select T ransmit P ower t o increa se or decrea se the transmit power .
The shor ter guar d inter val r esult s in a higher pack et collision rate when the delay-spread o f the channel e xceeds the guar d inter val or if timing synchronization betw een the transmit ter and receiver is not precise. Aggreg ation Aggregation is to merge the typical size o f data’ s header to one data.
7.4 W i reless MA C Filter Wireless MAC Filter is used to Allow or Deny wi reless clients, by their MAC addresses, from accessing the network. You can manually a dd a MAC address to restrict the access permission’s of the client. The default setting is Disable Wireless MAC Filters.
7.5 WDS Link Set tings WDS Link Settings is used to establish a conn ection between Access P o int s without forgoing Access P oint functionality . APs with WDS functi onality can extend the wir eless coverage and al low L AN s to c omm uni ca te wi th eac h ot her .
8 LAN Setup This section will guide y ou to setup th e Local Area Netw ork (L AN) settings 8.1 IP Settings This section is only av ailable for Non-R outer Mode . IP Settings allows you to conf igure the IP settings of the ENH500. IP Network Set ting Select Radio but ton for Obtain an IP addre ss autom atical ly or Specify an IP address .
8.2 Spanning T ree Settings Spanning T ree S t atus Select the Radio button to On or Off to toggle the Spanning T r ee function. Bridge Hello T ime Specify Bridge Hello T ime in seconds. Bridge Max Age Specify Bridge Max A ge in seconds. Bri dge F or w ard De lay Specify Bridge For ward Delay in seconds.
9 Router Settings This section is only av ailable for AP R outer Mode and Client Rout er Mode . 9.1 W AN S ettings There ar e four different types o f W AN connection s: S tatic IP , DHCP , PPP oE, and PPTP . Please cont act your ISP to determine the connection type.
Internet Connection Ty p e Select Stat i c I P to begin conf iguration of the S t atic IP connection. Account Name Specify Account Name that is provided by ISP . Domain Name Specify Domain Name that is provided by ISP . MTU Specif y the Maximum T ransmit Unit size.
9.1.2 DHCP (Dynam ic IP) Select DHCP as your W AN connection type to obtain the IP address automat ical ly . Y ou w ill need to enter Accou nt Name as your hos tname and DNS addresses (Optional) . Internet Connection T ype Select DHCP to begin conf iguration of the DHCP con nection.
Secondar y DNS ser vers manually . Discard Ping on W AN Place a check to En able or Dis able ping fr om W AN. Accep t / Can cel Press Accep t to co nf i rm th e ch ang es or Cancel to retu rn pre vious settings. Accept does not apply the changes – you must go to St atus -> Save / Load to apply the new set tings.
9.1.3 PPPo E (P oint -to-P oint Protocol over Ethernet) Select PPP oE as your WAN connection type if your ISP provides a Username and P assword. If the PPP oE is a DSL ser v ice, please remove the PPP oE s oftware from your computer a s the so f tware is not necessar y with the use o f the ENH500.
Connect on Demand Select the Radio button to s pec if y the maximum idle time. The Inte rnet will disconn ect when it r eaches the maximum idle time; however , it will automatically connect when a client tries to access the network . Keep Al ive Select the Radio button to keep internet connection always on.
9.1.4 PPTP (P oint -to-P oint T unneling Protocol) Select PPTP as your W AN connection type if your ISP provides information r egarding: IP Addr ess, S ubnet Mas k , Default G ateway (Optio nal), DNS (Optio nal), Se r ver IP , Userna me, and P asswor d.
Internet Connection Ty p e Select PPTP to begin conf iguration of the PPTP connec tion. MTU Specif y the Maximum T ransmit Unit size. EnG enius recomme nds that it re mains in Auto. IP Addre ss Specify WAN port IP address. IP Subnet Mask Specify WAN IP Subnet Ma sk .
9.2 L AN Settings (R outer Mod e) IP Addre ss Specify L AN por t IP address. IP Subnet Mask Specify L AN IP Subnet Mask . WINS Ser ver IP Specify WINS Ser ver IP . Use Router As DHCP Ser ver Place a check t o enable the DHC P ser ver . S tart ing IP Address Specify DHCP ser ver s tarting IP address.
9.3 VPN P ass Through VPN P ass Through is used t o allow cer tain prot ocols to be tunneled thr ough an IP network such as PPTP and L2TP , or to implement a secure exchange of pack et s at the IP Layer such as IPSec. PPTP P ass Through Place a check to enable PPTP protocol pa sses through W AN.
9.4 P or t For warding P or t F or w ard in g i s u se d to al lo w p ub li c se r v i ces su ch as Web S er ve r , M ai l Se r ve r , or F TP s e r v er to be set up.
9.5 DMZ Enabling DMZ will ex pose the computer which is in the DMZ to the Internet. This feature may be used in scenari os such as Internet G amin g or V ideo Confe renc ing.
10 Manageme nt Setting s The Management section is on the navigation drop-d own menu. You will see seven options: Administration, Manage ment VLAN, SNMP Settings, Backup / Restore Settings, Firmware Upgrade, Time Settings, and Log. Each option is described below.
Po r t if you specif y the P or t number is 8080, then you will need to enter the following http:// IP address : 8080 to access the web interface. Save / Apply / Cancel Press Sav e / A pply to conf irm the cha nge s or Cancel to return previous settings.
10.3 SNMP Set tings Cli ck on the SNMP Settings link under the Management menu. This is a networking management protocol used to monitor netw or k -at tached devices. SNMP allows messages [called protocol data unit s] to be sent to v a rious parts of a network .
10.4 Backup/R estore Settings Cli ck on the B ackup/Restore Setting link under the Management menu. This option is used to save the current settings of the device in a file on a storage devic e, or to load settings on to the device from storage device.
10.6 T ime Settings Cli ck on the Time Settings link under the Management menu. This page allow s you to configure the ti me on the d evice. Y ou may do this manu ally or b y connect ing to a NTP se rver. Manually Set Date and Ti m e Manually setup the date and time.
10.7 Log Cli ck on the Log link under the Man agement menu. This page displays a list of events that are triggered on the Ethernet and Wireless inte rfac e. This log can be referred to when an err or occurs on the system or w hen a report need s to be sent to the tec hnical support department for debugging purposes.
10.8 Diagnostics Cli ck on the Diagnosti cs link under the Management menu. This function allows you to detect connection quality and trac e the routing table to the target. Ta r g e t I P Specify the IP address you would lik e to search. Ping P acket Size Specify the pack et size of each ping.
11 Ne twor k Co nfig ura tion Exam ples This chapter describes the role o f the ENH500 with 4 modes. The Access P o int mode’ s default conf iguration is a central unit of the wir eless network or as a root device o f the wired environment. R epeater Mode and Mesh Netw ork Mode need addi tional conf iguration.
11.2 Client Bridge Mode Client Bridge Mode functions lik e a wireless do ngle. It must connect to an Access Point/AP R outer to join the network . Please refer to the la st section to check the Access P oint’ s conf iguration. Client Bridge S tep 1 Login to the web-base d conf iguration interface with the default IP: 192.
11.3 WDS Bridge Mod e Use this featur e to link multiple APs t ogether in a network . All clients a ssociated with any o f the APs can communi cate with each other similar to an ad-hoc mode.
11.4 Client R outer Mode In the Client R outer Mode, the ENH500 has a DHCP Ser ver that allows m ultiple device s to shar e the same Internet connection. Conn ect to an AP/WISP wir elessly and connect t o L ANs via wire d. Client R outer Mode is functi onally opposite to the AP R outer Mode.
Appendix A – Troubleshooting This appendix provides prob lem-solving in formation you may f ind useful in case you need to troubleshoot your ENH500. It also includes information about contacting t echnical suppor t.
A.2 Contacting T echnical S uppor t If you encounter issues that cannot be resolved using this man ual, please contact your vendor where you purchase the de vice. If you c annot contact your vendor, you may also co ntact EnGenius Customer Service department in the region where you purchased the device.
Appendix B – Specific ations MCU: Atheros AR7240 RF: Atheros AR9280 Memor y: 32 MB Flash: 8 MB Sta n d a r d : 802.11 a/n Physical Interface: - 1x L AN P or t with P oE support - 1x L AN P or t - 1x R eset butt on Max.
9 Mbps: 27 -92 12 Mbps: 27 -89 18 Mbps: 27 -85 24 Mbps: 27 -81 36 Mbps: 26 -79 48 Mbps: 24 -76 54 Mbps: 23 -75 802.11n (5.1 8 ~ 5.825 GHz) MCS0 / MCS8: 27 -94 MCS1 / MCS9: 27 -92 MCS2 / MCS10: 26 -88 .
Appendix C – Glossary Access P oint A ba se station in a WL AN that act as a central transmitter and receiver o f WL AN radio signals. Ad Hoc Ne twork A shor t -te rm WL AN framework creat ed between two or more WLAN adapters, without going through an Access P oint.
Cover age Area The geographical area that can be ser ved by a mobile communications network or sys tem. Cover age Hol e An area within the radio coverage footprint o f a wireless system wher e the RF signal level is below the design threshold.
HT mod e In the 802.11n system, two new formats, called High Throughput (HT), are defined for the Physical Layer, Mixed Mode, an d Green Field. If a system runs 40 HT, two adjacent 20 MHz channels are used. The larger 40 MHz bandwi dth can provide better transmit quality and speed.
R emote Authentication Dial-In User Ser vice (RADIUS) Networking protocol that provides centralized authentication, authorization, and accounting management for com puters to connect and use a network ser vice.
W ireless Client S upplicants So f tware that runs on an operating system, in structing the wir eless client how to use WP A. WP A -Pre-Shared Key (WP A-PSK) WP A-PSK requir es a single (identical) passwor d entered int o each Access P oint, wir eless gateway , and wir eless client.
Appendix D – Statemen ts of Conformity D .1 – Fe deral Communica tion Commissi on Inte r ference S tatement This equipment has been tes ted and found to comply with the limits for a C lass B digit al device, pursuant to P ar t 15 of the FC C Rules.
D .2 – Industr y Canada S tate ment This device co mplies with RSS-21 0 o f the Industr y Canada Rules. Operation is subject to the following two conditions: (1) This devic e may not cause harmful in terference , and (2) this device must accept any int erference receiv ed, including interference that may cause undesired operation.
D .3 – Europ e Declaration of Confor mity This device complies with the essential requir em ents of the R&T TE Directive 1999/5/EC. The following test methods have been applied in order to prov .
0560 Č esky [Czech] [Jméno výrob ce] tímto pr ohlašuje, že tento [typ za ř ízení] je ve shod ě se zákla dními požadavky a dalšími p ř íslušn ými us tanoveními sm ě rnice 1999/5/ES.
Slovensk o [Slovenian] [Ime proizvajalca] izjavlj a, da j e ta [tip opreme] v skladu z bis tvenimi zahtevami in ostalimi re lev antni mi d olo č ili di rektive 1999/5/ES. Slovensky [Slovak] [Meno výrobcu] týmto vyhlas uje, že [typ zariadenia] sp ĺň a základné požiadavky a všetky príslušné ustanovenia Smernice 1999/5/ES.
Ein wichtiger Punkt beim Kauf des Geräts EnGenius ENH500 (oder sogar vor seinem Kauf) ist das durchlesen seiner Bedienungsanleitung. Dies sollten wir wegen ein paar einfacher Gründe machen:
Wenn Sie EnGenius ENH500 noch nicht gekauft haben, ist jetzt ein guter Moment, um sich mit den grundliegenden Daten des Produkts bekannt zu machen. Schauen Sie zuerst die ersten Seiten der Anleitung durch, die Sie oben finden. Dort finden Sie die wichtigsten technischen Daten für EnGenius ENH500 - auf diese Weise prüfen Sie, ob das Gerät Ihren Wünschen entspricht. Wenn Sie tiefer in die Benutzeranleitung von EnGenius ENH500 reinschauen, lernen Sie alle zugänglichen Produktfunktionen kennen, sowie erhalten Informationen über die Nutzung. Die Informationen, die Sie über EnGenius ENH500 erhalten, werden Ihnen bestimmt bei der Kaufentscheidung helfen.
Wenn Sie aber schon EnGenius ENH500 besitzen, und noch keine Gelegenheit dazu hatten, die Bedienungsanleitung zu lesen, sollten Sie es aufgrund der oben beschriebenen Gründe machen. Sie erfahren dann, ob Sie die zugänglichen Funktionen richtig genutzt haben, aber auch, ob Sie keine Fehler begangen haben, die den Nutzungszeitraum von EnGenius ENH500 verkürzen könnten.
Jedoch ist die eine der wichtigsten Rollen, die eine Bedienungsanleitung für den Nutzer spielt, die Hilfe bei der Lösung von Problemen mit EnGenius ENH500. Sie finden dort fast immer Troubleshooting, also die am häufigsten auftauchenden Störungen und Mängel bei EnGenius ENH500 gemeinsam mit Hinweisen bezüglich der Arten ihrer Lösung. Sogar wenn es Ihnen nicht gelingen sollte das Problem alleine zu bewältigen, die Anleitung zeigt Ihnen die weitere Vorgehensweise – den Kontakt zur Kundenberatung oder dem naheliegenden Service.
