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Modem Huawei mungkin tidak asing lagi bagi teman-teman yang selama ini malang melintang di jalur HSDPA. Iya, modem ini adalah paket bundling dengan IM2 Broom yang katanya kecepatannya kencang. Tapi tahukah anda kalau modem ini ternyata diperuntukkan khusus untuk kartu IM2 saja, dengan kata lain kita tidak dapat berpindah ke lain hati selain dari kartu IM2 ini. Setelah lama pencarian dan pencarian di rumah om Google akhirnya menemukan rahasia dibalik Huawei e220 ini yaitu cara untuk mencari pasangan lain untuk modem Huawei kita atau dengan kata lain meng-unlock modem kita.

Berikut langkah-langkah yang harus dilakukan :

1. Pastikan aliran listrik ke PC/Laptop sobat stabil 100%. dan disarankan mengunakan Laptop dikarenakan adanya peran baterai untuk power cadangan seandainya listrik down.
2. Keluarkan SIM CARD dari modem
3. Pastikan koneksi USB dari PC ke Modem stabil
4. Download file upgrade firmwarenya di http://rapidshare.com/files/97958950/Firmware-Update-E220Update 11.110.05.00.00.rar dan jalankan
5. Ikuti instruksi yang muncul di layar. Modem anda akan connect/disconnect dengan sendirinya. ini wajar, karena dalam proses flashing ulang (akan terjadi beberapa kali restart modem.
6. Download software upgradenya lagi di http://rapidshare.com/files/97960482/Software-Update-E220-UTPSB002D03SP04C03 20 Normal .rar dan eksekusi juga. ikuti juga instruksi yang akan muncul
7. Uninstal software modem yang sebelumnya di instal
8. Setelah berhasil, disconnect dan connect lagi modem sobat
9. Install kembali software modem bawaan dari modem sobat
10. Nama software yang baru adalah Mobile Partner, menggantikan Mobile Connect

Selamat mencoba.....

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Setting up and managing a DHCP server in Windows 2000 Dynamic Host Configuration Protocol (DHCP) is an invaluable service when you have a network larger than a handful of computers. It’s also a standard component of enterprise networks and subnetworks. Windows 2000’s built-in DHCP server allows Windows machines (and any other TCP/IP-based machines and devices) to obtain their IP addresses and network settings automatically, which can vastly simplify network configuration. In this article, we’ll discuss how to install and configure a DHCP server in Windows 2000, and we’ll explore some of the advanced features Win2K DHCP has to offer. Create a plan Before you configure your DHCP server, it is a good idea to have all your ducks in a row. Prepare and have all the necessary information up front before sitting down and configuring your server. For example, you may need to know:

• The scope of IP addresses that your server will manage (e.g., 192.168.1.50 to 192.168.1.200).
• Which machines require static IP addresses (i.e., those machines such as servers and routers that will not use DHCP to receive their IP addresses but will be set manually).
• Which network information you want to send out to DHCP clients when they get their IP addresses (e.g., the addresses for your default gateway, DNS servers, and WINS servers).

It is much easier to configure your DHCP server with this information at hand rather than scrambling for it at implementation time. Installing DHCP Installing DHCP on a Windows 2000 Server or Advanced Server is a fairly simple process. During the installation, you might get prompted to insert your Windows 2000 Server or Advanced Server CD (or locate the i386 folder on a local or network drive). To install DHCP Service:

1. Open the Control Panel and double-click Add/Remove Programs.
2. Click Add/Remove Windows Components.
3. Highlight Networking Services and click Details.
4. Select Dynamic Host Configuration Protocol (DHCP) and click OK.
5. Click Finish when prompted.

Configuring your DHCP server After you install a DHCP server, go to Start | Programs | Administrative Tools | DHCP to open the Windows 2000 console for managing the DHCP service When setting up a DHCP server, the first thing you have to do is define a scope. A scope is a list of valid IP addresses you want the DHCP server to be able to assign to clients. When a machine requests TCP/IP information from the DHCP server, the information is provided from the scope you created. About scopes When you create a scope, you must select the range of IP addresses and you must specify the appropriate scope options to include. These options are what we were referring to above when we mentioned that you can assign other network information to your clients at the time they are given an IP address. There are two types of scope options: Global and Scope. Global options are propagated to all the scopes that you create on that DHCP server, while Scope options are only for the individual scope that you are working with. For example, if you have different scopes for several different subnets and each subnet will have a different default gateway but will share the same DNS servers, you would want to set the DNS servers as a Global option while the default gateways would be set separately in each scope as a Scope option. If you create a scope and later run out of IP addresses, don’t fret. You can create an additional scope and your new scope will assign IP addresses where your previous scope ended. To define a scope using the Create Scope Wizard:

1. From the Action menu, select New Scope to launch the Create Scope Wizard, and then click Next.
2. Type a name and description of your scope and click Next.

Enter the start and end IP addresses of your scope. Remember to also assign the appropriate subnet mask as well. Click Next. This window is where you specify all of your static IP addresses to exclude from your scope. Add any exclusions and click Next Enter the amount of time the lease is active and click Next

1. The next screen asks you whether you want to configure your DHCP options now or later. For this article, we will select Yes, I Want To Configure These Options Now and click Next.
2. Enter your domain name and add the IP addresses for your DNS servers.

Enter the addresses of any WINS servers you configured on your network for resolving NetBIOS names into IP addresses. Choose Yes or No to indicate whether to activate your scope. There is still more work to be done, so we will choose No. Click Finish Adding reservations In addition to specifying exclusions, you can add reservations to your DHCP server. By adding a reservation, you ensure that a machine always receives the same IP address from the DHCP server. To add a reservation:

1. From the DHCP console, click the + sign next to the scope you created.
2. Click Reservations and select Action | New Reservation,

1. Enter a friendly name for the reservation and the IP address you want to assign to the computer or device.
2. Enter the MAC address of the computer or device. (For Windows NT/2000 machines, you can find the MAC address by running ipconfig/all from the command prompt of the machine.)
3. Enter a description and then choose the following reservation type: DHCP, BOOTP (going across a router), or both. Click Add.

Authorizing the DHCP server and activating scopes Remember that after you install and configure your DHCP server, you will need to authorize your scope before it can be activated. Authorizing your DHCP server allows you to prevent hackers from configuring rogue DHCP servers. To authorize your DHCP server:

1. From the DHCP console, click on the DHCP icon.
2. From the Action menu, select Manage Authorized Servers,

Click Authorize and enter the name or IP address for your server, Now you’re ready to activate your DHCP server and bring it online. Click the scope you created and choose Activate from the Action menu.

Voice over Internet Protocol (VoIP, IPA: /vɔɪp/) is a general term for a family of transmission technologies for delivery of voice communications over the Internet or other packet-switched networks. Other terms frequently encountered and synonymous with VoIP are IP telephony and Internet telephony, as well as voice over broadband, broadband telephony, and broadband phone, when the network connectivity is available over broadband Internet access.

VoIP systems usually interface with the traditional public switched telephone network (PSTN) to allow for transparent phone communications worldwide.

VoIP can be a benefit for reducing communication and infrastructure costs by routing phone calls over existing data networks and avoiding duplicate network systems.

Voice-over-IP systems carry telephony speech as digital audio, typically reduced in data rate using speech data compression techniques, packetized in small units of typically tens of milliseconds of speech, and encapsulated in a packet stream over IP

History

Voice-over-Internet Protocol has been a subject of interest almost since the first computer network. By 1973, voice was being transmitted over the early Internet The technology for transmitting voice conversations over the Internet has been available to end-users since at least the early 1980s. In 1996, a shrink-wrapped software product called VocalTec Internet Phone (release 4) provided VoIP along with extra features such as voice mail and caller ID. However, it did not offer a gateway to the PSTN, so it was possible to speak only to other Vocaltec Internet Phone users.^[3] In 1997, Level 3 began development of its first softswitch (a term they invented in 1998); softswitches were designed to replace traditional hardware telephone switches by serving as gateways between telephone networks

Revenue in the total VoIP industry in the US is set to grow by 24.3% in 2008 to $3.19 billion. Subscriber growth will drive revenue in the VoIP sector, with numbers expected to rise by 21.2% in 2008 to 16.6 million

Cisco to ship Wi-Fi mobile phone in June

he phone, which will carry the model number 7920, communicates only with IEEE 802.11b technology and is designed for use within enterprises rather than totally replacing a cell phone, said Charlie Giancarlo, senior vice president and general manager of switching, voice and carrier systems. However, San Jose, California-based Cisco is in talks with cell phone makers about the possibility of adding cell phone capability to such a device, which might carry the Cisco brand.

The 7920 joins Cisco's 7960 IP (Internet Protocol) phone, which sits on a desk and plugs into a wired Ethernet network, and brings the added benefit of mobility around a building or campus that has a wireless LAN. It uses the same type of interface as the 7960, albeit with a smaller display, and lets users enjoy all the features of the company's IP PBX (private branch exchange) wherever the wireless LAN reaches. The phone will ship in June at least in the U.S. and will be available in other countries soon after, he said.

The new phone could be ideal for environments such as retail stores where employees need to move around a site during the work day, Giancarlo said. A phone that combines Wi-Fi with wide-area cell phone capability would be well suited to mobile professionals who frequently use a cell phone for business calls, he added.

No price has been set yet for the 7920, which is currently in beta testing. The example shown in a presentation Wednesday was dark gray and looked like a slightly bulky cell phone. To make the product practical, Cisco broke through a high power consumption problem that some industry observers have cited as a challenge for handheld Wi-Fi devices, Giancarlo said. The phone should deliver two hours of talk time and 24 hours of standby time on a charge, he said. It will be available with a cradle that can be used for charging and will have a jack for a headset so employees can use a single phone at work, he added.

Companies are starting to embrace IP telephony now that problems such as quality of service have been worked out, according to James Pratt, vice president of sales at Netcom Group, a value-added reseller in Grand Rapids, Michigan, who attended the conference. Customers are turning to IP telephony because it simplifies their network infrastructures and can lower costs, and a mobile IP phone would be attractive to many companies because it would let them add mobility without paying for cell phone airtime, Pratt said. On the other hand, combining Wi-Fi
and wide-area cell phone capability on a single device is still hard in North America because there are multiple cell phone technologies in use, he said.

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HSDPA(High-Speed Downlink Packet Access)

Technology
The High-Speed Downlink Shared Channel (HS-DSCH) lacks two basic features of other W-CDMA channels — variable spreading factor and fast power control. Instead, it delivers the improved downlink performance using adaptive modulation and coding (AMC), fast packet scheduling at the base station, and fast retransmissions from the base station, known as hybrid automatic repeat-request (HARQ).

Hybrid automatic repeat-request (HARQ)
HARQ uses incremental redundancy, where user data is transmitted multiple times using different codings. When a corrupted packet is received, the user device saves it and later combines it with the retransmissions, to recover the error-free packet as efficiently as possible. Even if the retransmitted packets are corrupted, their combination can yield an error-free packet

Secara teoritis, range jarak akses WiMAX (Worldwide interoperability for Microwave Access) dapat mencapai 30 km (sama dengan range untuk GSM) dengan kecepatan bandwith 75 Mbit/s. Semakin jauh terminal dari base station, semakin lemah sinyal dari WiMAX. Jadi sinyal dengan rasio 3,5GHz akan jauh lebih cepat daripada GSM. Sementara untuk HSDPA (High Speed Downlink Packet Access) memiliki kecepatan maksimum 14,4 Mbit/s dalam jarak kurang dari 1 km dari base station. Dalam jarak 6 km, aliran data akan drop ke kecepatan 1 Mbit/s.HSDPA memiliki beberapa prinsip yakni jika user tidak mendapat bandwith yang lebih tinggi, teknologi HSDPA masih dapat menggunakan layanan transmisi data, namun dengan bandwith yang lebih rendah (pada level WCDMA atau GPRS/EDGE), HSDPA hanya mampu mengirim transmisi data dalam hitungan dosin kilobit per second (Kbps).Jumlah user. Teknologi HSDPA dapat digunakan untuk banyak user secara bersama-sama, sementara WiMAX paling bagus penggunaannya dalan jumlah yang terbatas, atau dalam ratusan terminal. Terlebih lagi terdapat masalah serius yang terjadi pada WiMAX dalam jaringan corporate, ketika angka user semakin bertambah. Jika semua user tiba-tiba memutuskan untuk download file besar dari Internet, hal tersebut akan berimbas pada aliran data. Namun, dalam kasus HSDPA (fitur ini adalah turunan dari CDMA) untuk kasus tersebut, semua user akan mendapat aliran data yang lambat, sedangkan pada WiMAX router dalam situasi yang sama, kemungkinan akan gagal untuk menanganinya.Bandwith. Bandwith WiMAX dan HSDPA memiliki lebar yang sama dari base station. WiMAX tidak memiliki banyak range frekuensi, namun WiMAX memilik banyak cara untuk mengembangkannya yakni dengan membentuk range baru dari 10GHz ke 66GHz, skema modulasi baru dan MIMO (Multiple-Input-Multiple Output). Sedangkan HSDPA, yang merupakan pengembangan dari WCDMA, mampu mengatasinya untuk masalah efisiensi.Multimedia. Kedua teknologi memiliki kapasitas yang sama untuk transmitting data multimedia. WiMAX dan HSDPA memiliki prioritas QoS dan trafik. Pilihan antara kedua komunikasi data, baik dalam WCDMA/HSDPA atau VOIP/WiMAX adalah hal yang teknis, namun dalam segi ekonomi, trafik WiMAX lebih murah daripada HSDPA.Keamanan. HSDPA tidak menyediakan fungsi keamanan tambahan. Autentikasi user dilakukan dari SIM card (atau RUIM). Data masing-masing user akan dikodekan secara berbeda menurut standard CDMA, dan bekerja jauh lebih baik daripada algoritma kriptografi, kecuali jika ada penyusup yang masuk ke base station atau suatu ketika penyusup tersebut mendapatkan kode channel (seperti agen khusus). Sementara WiMAX telah support dengan algortima kriptografi modern (contohnya AES dengan kunci 1024 bit). WiMAX akan menyenangkan user yang ingin menyimpan kerahasiaan datanya, namun kerahasiaan data user tersebut tidak bertahan lama, seperti perumpamaan tidak ada keamanan yang tidak bisa dijebol.