Cisco Systems 7920 manual

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Buen manual de instrucciones

Las leyes obligan al vendedor a entregarle al comprador, junto con el producto, el manual de instrucciones Cisco Systems 7920. La falta del manual o facilitar información incorrecta al consumidor constituyen una base de reclamación por no estar de acuerdo el producto con el contrato. Según la ley, está permitido adjuntar un manual de otra forma que no sea en papel, lo cual últimamente es bastante común y los fabricantes nos facilitan un manual gráfico, su versión electrónica Cisco Systems 7920 o vídeos de instrucciones para usuarios. La condición es que tenga una forma legible y entendible.

¿Qué es un manual de instrucciones?

El nombre proviene de la palabra latina “instructio”, es decir, ordenar. Por lo tanto, en un manual Cisco Systems 7920 se puede encontrar la descripción de las etapas de actuación. El propósito de un manual es enseñar, facilitar el encendido o el uso de un dispositivo o la realización de acciones concretas. Un manual de instrucciones también es una fuente de información acerca de un objeto o un servicio, es una pista.

Desafortunadamente pocos usuarios destinan su tiempo a leer manuales Cisco Systems 7920, sin embargo, un buen manual nos permite, no solo conocer una cantidad de funcionalidades adicionales del dispositivo comprado, sino también evitar la mayoría de fallos.

Entonces, ¿qué debe contener el manual de instrucciones perfecto?

Sobre todo, un manual de instrucciones Cisco Systems 7920 debe contener:
- información acerca de las especificaciones técnicas del dispositivo Cisco Systems 7920
- nombre de fabricante y año de fabricación del dispositivo Cisco Systems 7920
- condiciones de uso, configuración y mantenimiento del dispositivo Cisco Systems 7920
- marcas de seguridad y certificados que confirmen su concordancia con determinadas normativas

¿Por qué no leemos los manuales de instrucciones?

Normalmente es por la falta de tiempo y seguridad acerca de las funcionalidades determinadas de los dispositivos comprados. Desafortunadamente la conexión y el encendido de Cisco Systems 7920 no es suficiente. El manual de instrucciones siempre contiene una serie de indicaciones acerca de determinadas funcionalidades, normas de seguridad, consejos de mantenimiento (incluso qué productos usar), fallos eventuales de Cisco Systems 7920 y maneras de solucionar los problemas que puedan ocurrir durante su uso. Al final, en un manual se pueden encontrar los detalles de servicio técnico Cisco Systems en caso de que las soluciones propuestas no hayan funcionado. Actualmente gozan de éxito manuales de instrucciones en forma de animaciones interesantes o vídeo manuales que llegan al usuario mucho mejor que en forma de un folleto. Este tipo de manual ayuda a que el usuario vea el vídeo entero sin saltarse las especificaciones y las descripciones técnicas complicadas de Cisco Systems 7920, como se suele hacer teniendo una versión en papel.

¿Por qué vale la pena leer los manuales de instrucciones?

Sobre todo es en ellos donde encontraremos las respuestas acerca de la construcción, las posibilidades del dispositivo Cisco Systems 7920, el uso de determinados accesorios y una serie de informaciones que permiten aprovechar completamente sus funciones y comodidades.

Tras una compra exitosa de un equipo o un dispositivo, vale la pena dedicar un momento para familiarizarse con cada parte del manual Cisco Systems 7920. Actualmente se preparan y traducen con dedicación, para que no solo sean comprensibles para los usuarios, sino que también cumplan su función básica de información y ayuda.

Índice de manuales de instrucciones

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    Corporate He adquarters Cisc o Syst ems , Inc . 170 West Ta sman Drive San Jos e, CA 95 134-1706 USA http://www.ci sco.com Tel: 408 526-4000 800 553- NETS (638 7) Fax: 408 526-4100 Site Sur v e y Guide f or Deplo ying Cisco 7920 IP Phones April 20 05 Text Pa rt Nu mber: OL-6315- 01[...]

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    THE SPECIFICATIONS AND INFORMATION REGARDING TH E PRODUCTS IN THIS MANUAL ARE SUBJE CT TO CHANGE WITHOUT NO TICE. ALL STATEMENT S, INFORMATI ON, AND RECOMMENDA TIONS IN T HIS MANUAL ARE BELIEVED TO BE ACCURATE BU T ARE PRESEN TED WITHOUT WARRANTY OF ANY KIND, EXPRE SS OR IMPLIED. USERS MUST TA KE FULL RESPONSIBILITY FOR THEIR AP PLICATION OF ANY PR[...]

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    iii Site Sur vey Guide fo r Deploying C isco 7920 IP Pho nes OL-6315-01 CONTENTS Preface v CHAPTER 1 Overview 1- 1 Recommenda tion s for Succe ssful VoI P Surveys 1-1 Gettin g star ted 1-2 Minimum Requ irement s for WIPT Cel ls 1-4 The Idea l WIPT Env ironment 1-5 Data Ra te a nd Sign al S trength Cons iderati ons 1-6 Mult i-floo r surv ey 1-7 Comp[...]

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    Cont ent s iv Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01[...]

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    v Site Sur vey Guide fo r Deploying C isco 7920 IP Pho nes OL-6315-01 Preface This doc ument provides inst ructio ns and guidelin es for condu cting a site su rvey for wir eless LA Ns using V oice over IP (V oIP) o n Cis co 79 20 IP Phon es. W ith the intro ducti on of voice to a predom inantl y wireless da ta network the method ology of site surve[...]

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    vi Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Preface[...]

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    C HAPTER 1-1 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 1 Overview This documen t be gins by identif ying the spec ific radi o en vironmenta l v alue s that ar e ne eded fo r a successful voice de ployment. Note Cisc o offers a Cisco Aironet Wireless Site Survey class for techni cal individuals who w ill be perf orming site[...]

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    1-2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s degr adation. This qua lity requiremen t also dictates the need for a fast roami ng solution betwee n access points whe re the network can re associate a client to a new access point with in 100 ms (that is, wit[...]

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    1-3 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 1 Ov erview Recommen dations f or Succ essful Vo IP Surveys Figur e 1 -1 ACU Site Surv e y Window Noise is def ined as a 2.4-GHz signal that is not in an 802 .11 DSSS format bu t is in the frequency range of the access p oint’s conf igure d ch anne l. The noise can or[...]

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    1-4 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s Figur e 1 -2 Signal to Noise Ratio Minimum Require ments for WIP T Cells Ta b l e 1 - 1 lists the minimum v alues for v oice and data cells. F or WIPT cells, Cisco recommend s that the cell edg e be –67 dBm a [...]

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    1-5 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 1 Ov erview Recommen dations f or Succ essful Vo IP Surveys difference in transm itter power an d receiver sensitivity that ma tters beca use the gai n of an an tenna i s recip rocal. T o v erify the ce ll coverage ed ge of –67 d Bm whi le the client is actively sendi[...]

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    1-6 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s Figure 1-4 also illustrates the recommended o ver lap of 15 to 20 percent for WIPT cells ( larger than the 10 to 15 p ercent for data cells). The reason for the increa se in o verla p is to pro vide en ough capa[...]

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    1-7 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 1 Ov erview Recommen dations f or Succ essful Vo IP Surveys The char acteristic s of V oIP r equire a met iculous WIPT site sur vey . T o av oid a c all with ji tter , th e delay variation betwe en packets shoul d not exceed 30 ms. Th e one-way de lay should not exceed [...]

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    1-8 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s Compariso n of a M anual Surve y and an A utomated S urvey Figure 1-6 sh ows an act ual ho spital survey done using Ai rMag net Surveyor wit h an 8 02.11b Cisco PCM350 cl ient ca rd. Four pa nels on t he Ai rMag[...]

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    1-9 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 1 Ov erview Recommen dations f or Succ essful Vo IP Surveys Fi g u re 1-7 Ho s p i ta l F l oo r Su r vey by a S u r vey Cre w[...]

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    1-10 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s[...]

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    C HAPTER 2-1 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 2 Survey Tools AirM agnet offers ma ny tools f or an alyzi ng 80 2.11 perform ance at a site . Fi gure 2-1 sh ows the AirMagn et Survey tool. Cisco reco mmend s AirMagne t for data an d WIPT surveys. Figur e 2-1 AirMagne t Surve y T ool An acc urate s urv ey requi res [...]

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    2-2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Figur e 2-2 AirMagnet P a ck et Decode T ool The 7920 survey tool rep orts the signal stren gth of the sign al from the a ccess poi nt as an RSSI value. Most client c ard utilitie s report signal str ength as dBm or per cent of signal str ength. In this c[...]

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    2-3 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools The d ata in Ta b l e 2 - 1 was c reated fr om live tests. Each tool an d card combi nation data po int was taken at the sam e time from the same dis tance. Th e en viro nment w as an open of fice . The fl oor plan used for the test is sho wn in Figure 2-[...]

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    2-4 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls The Cisc o CB21 ADU repor ts signal st rength in dBm . Figur e 2-4 shows the ADU Adv anced Status windo w . Figur e 2-4 ADU Ad v anced Stat us Windo w[...]

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    2-5 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools Figur e 2-5 AirMagnet Surve y T ool[...]

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    2-6 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls The Air Magnet Survey packet de code tool shows signal strengt h in dBm. Figur e 2-6 shows the AirMag net Surv ey P acket Decode win do w . Figur e 2-6 AirMagnet P a ck et Decode Windo w The AiroPeek tr ace sho ws the signal dBm v alue and signal percenta[...]

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    2-7 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools Figur e 2-7 Air oP eek Windo w AiroPeek has options to show real-t ime graphs of current signal strengt h and current noise le vels both in dBm and pe rcen tages, but it does not have a surve y tool like A CU or AirM agne t. Figure 2-8 shows the AiroPeek [...]

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    2-8 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Figur e 2-8 Air oP eek dBm and Signa l P er centag e Real-Time Graph s Snif fer Pro fr om Network A ssociates sho ws th e signal strength in a perce nt v alue. There is no option to sho w RSSI or dBm v alues. Snif fer Pro is t race utility with no support[...]

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    2-9 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools The Cisc o access point displ ays the signa l strength of the packets fr om the client. The signal str ength of the ac cess point as r eported b y the client utilit y should be relati v ely close to t he signal stre ngth reported by the access point for t[...]

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    2-10 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Figure 2-11 shows that the 7920 hears th ree acce ss points an d the RSSI values of those access points ar e 18, 31, and 48. Figur e 2-1 1 Cisco 79 20 IP Phone Surv ey Scr een Y ou can also use Air Magnet Su rveyor to de termine chann el s eparation. Fig[...]

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    2-11 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools Survey Too ls for Pa cket Jit ter Survey Tools for Packet Jitter T ypicall y , voice pac kets ar e sent every 20 ms. V oice calls ar e usual ly bursty , co nsist ing of a group of tightly pack ed packet s in a transmit direction follo wed by a tigh tly p[...]

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    2-12 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Survey To ols for Packet J itter Figur e 2-1 4 AirMagnet Jit te r T ool in an Ent er pr ise Off ice with High 8 02.1 1 T ra ffic Figure 2-15 an d Figure 2 -16 show the L iv eCaptu re window a nd the Station window re sults in a h ome off ice wit h low 80[...]

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    2-13 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools Survey Too ls for Pa cket Jit ter Home off ice u tiliz ation is 2 .18 p ercent and t he throughp ut i s 246 kbps for 1 1 Mbp s-onl y calls, wit h a single act iv e WIPT call, but utiliz ation is 15.41 perc ent with throughpu t of 248 kbps for 1 Mbps-onl [...]

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    2-14 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Survey To ols for Packet J itter[...]

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    C HAPTER 3-1 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 3 Surveying for Cell Capacity an d Channel Re-Use This chap ter de scribe s ho w to perfo rm a site sur ve y to de sign a wirele ss LAN for cel l capaci ty and chan nel re -use. Survey Design f or Cell Capacity Cisco recommends that you install enough access points to [...]

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    3-2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapt er 3 Surveying f or Cell Capacit y and Channel Re -Use Survey Des ign for Cell Capac ity Note If the Cisco acces s point is configured to di sable data rates 1, 2, and 5. 5, clients ar e not requi red to transmit on ly at 11 Mbps. In fact, ol der cli ent devices might not b[...]

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    C HAPTER 4-3 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 4 Conducting a WIPT Survey This chapter describes specific steps for performing a site survey for WIPT . How To Survey for the WIPT Cisco recommen ds that the fi rst step of a surve y is to work wit h administrators at the local site to determ ine the requi rement s of[...]

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    4-4 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT Figur e 4-1 Ideal WIPT En vir onment Channel R e-Use Figure 4-2 shows the typica l chan nel r e-use fo r 802.1 1b and 802.1 1g WLAN s. The two gold chan nel 1 cells a re -8 6 dBm apart from ce nter to cente r . The [...]

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    4-5 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 4 Condu cting a WIPT Surv ey How To Survey for the WIPT Manual Su rvey for the WIP T Y o u can use passive or activ e mode w hen you use A CU to run a si te survey . Figur e 4-3 shows the A CU Site Surv ey windo ws. Figur e 4-3 ACU Site Surv e y Windows T o set u p acti[...]

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    4-6 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT Figur e 4-4 ACU Site Surv e y Activ e Mode Click OK to retu rn to the Site Surve y screen. Click Start to start the site surv ey in acti v e mode. This information updates constan tly during the surv ey: • Percent[...]

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    4-7 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 4 Condu cting a WIPT Surv ey How To Survey for the WIPT The AirMagnet su rve yor works v ery well for surv e ying a site with an in stalled WLAN or for surv e ying a site wit hout a WLAN. The tool w orks with the existing tra nsmit po wer of the a ccess points, b ut all[...]

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    4-8 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT Figur e 4-6 AirMagnet Surv e y Activ e Mode T o survey a group of acc ess point s using the A ctive Mode tool, configur e the too l with an SSID that is configured on the access points. T o be gin the data colle cti[...]

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    4-9 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 4 Condu cting a WIPT Surv ey How To Survey for the WIPT Figur e 4-7 AirMagnet Client W alkabout When you selec t display mode on the bottom tool bar, SiteV iewer displays da ta collec ted during t he surve y . T w o new panels appear in this mode: th e Filter area in th[...]

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    4-10 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT Figur e 4-8 AirMagnet Sho win g Acce ss P o ints and Mer g ed Displ ay Figure 4-9 sh ows Site V iewer’ s four-p anel display . V ie w ing more than one surve y data type helps you comp are me asure ment factor s.[...]

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    4-11 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 4 Condu cting a WIPT Surv ey How To Survey for the WIPT Figur e 4-9 AirMagnet Four -P anel Displa y[...]

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    4-12 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT[...]

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    C HAPTER 5-1 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 5 Positioning Access Points and Ante nnas for Site Surveys When you perform a site surve y , it is important to position wire less equipmen t for opti mal co verage. This chap ter de scribe s best practic es for p osition ing access p oints and antennas. Access Point P[...]

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    5-2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 5 Positioning Access Points and Antennas for Site Surveys Antenn as and Ant enna Posit ioning The access point in Figure 5- 2 provides b etter c overage beca use the re flecte d sig nal prod uces fewer nul ls and less multipa th than the I-beam pl acement. Ho we v er , be[...]

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    5-3 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 5 Positioning Access Po ints and A ntennas f or Site Surve ys Ant ennas an d Ante nna Pos itioni ng Figure 5-4 shows a p atch ante nna mount ed on a wa ll. The ant enna cab les are ro uted ab ov e the sus pende d ceili ng and are attach ed to a hi dden acc ess poi nt. F[...]

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    5-4 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 5 Positioning Access Points and Antennas for Site Surveys Antenn as and Ant enna Posit ioning Figure 5-6 shows a pat ch ant enna m ounted o n a suspe nded cei ling. The cable s are h idden an d are routed abov e the cei ling to the access point. Figur e 5-6 P atc h Ant en[...]

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    A- 1 Site Sur vey Guide fo r Deploying C isco 7920 IP Pho nes OL-6315-01 APPEND IX A Additional Sources of Information This a ppendix lists docume nts th at provi de addit ional i nfor mation about si te su rveys: • Cisco W ir eless IP Phone 7 920 D eploym ent Rec ommendat ions http://www .cisco.com/e n/US/products/hw/phon es/ps379/prod ucts_whit[...]

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    A- 2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Appendix A Additional Sources of Information[...]