December 17, 2008


Cyberoam lebih tinggi dari global CISCO dan Checkpoint

Bulan Juni 2008, Gartner di dalam laporan Market Scope for Multifunction Firewalls for Small and Midsize Businesses (SMB) / Pangsa Pasar Perangkat Keamanan Jaringan untuk Usaha Kecil Menengah, menempatkan Cyberoam di posisi Positif - lebih tinggi dibandingkan pemain global CISCO dan Checkpoint.

Baru-baru ini juga Frost & Sullivan menganugerahkan Cyberoam sebagai Asia-Pacific Emerging Company of the Year for Network Security / Perusahaan Menonjol Tahun ini Se-Asia Pasifik untuk Solusi Keamanan Jaringan.
Solusi keamanan jaringan Cyberoam UTM berdasarkan identitas, menawarkan proteksi yang komprehensif terhadap berbagai ancaman Internet yang ada sekarang maupun mendatang, termasuk virus, worm, trojan, spyware, dan lainnya. Cyberoam memberikan fitur lengkap berupa stateful inspection firewall, VPN, gateway anti-virus and anti-spyware, gateway anti-spam, intrusion prevention system, content filtering, bandwith management dan multiple-link management, semuanya ini di dalam satu platform.

Cyberoam juga sudah disertifikasi oleh West Coast Labs, dengan CheckMark UTM Level 5 Certification, ICSA Labs, sebuah divisi independen dari Verizon Business, dan juga anggota dari Konsorsium Virtual Private Network. Cyberoam juga menerima peringkat 5 bintang dari SC Magazine di tahun 2007 dan 2008, dan berbagai penghargaan lainnya.

Cyberoam sudah masuk ke lebih dari 60 negara di dunia, dalam waktu 2 tahun sejak peluncurannya. Di antaranya Amerika Serikat, Inggris, Perancis, Swiss, Republik Chechnya, Australia, dan lainnya. Ini menunjukkan eksistensi dan solusi nya yang sangat diterima pasar.

December 16, 2008


ITU H.264: The Advanced Video Coding Standard

The ITU-T has prepared a brochure giving an overview of ITU-T's H.264 advanced video coding standard. The increased compression efficiency of the new ITU-T H.264/MPEG-4 Advanced Video Coding (AVC) standard will lead to new application areas and business opportunities. Broadcasting over cable, satellite, cable modem, terrestrial, etc., will benefit from the new standard. It is now possible to transmit video signals at about 1 Mbit/s with TV (PAL) quality, which enables streaming over xDSL connections. Another interesting business area is TV transmission
over satellite. By choosing H.264, the number of programmes per satellite can be doubled in comparison to current systems using H.262 (MPEG-2). Also, in the field of mobile communication, H.264 will play an important role because the compression efficiency will be doubled in comparison to the coding schemes previously specified by Third-Generation Mobile (3GPP and 3GPP2) for streaming.

The new Recommendation is destined to influence further application areas including but not limited to the following:
* Interactive or serial storage multimedia (ISM or SSM) on optical and magnetic devices, DVD, etc.
* Real-time conversational services (RTC), such as videoconferencing and videophone, over ISDN, Ethernet, LAN, DSL, wireless and mobile networks, modems or mixtures of these.
* Video-on-demand or multimedia streaming services, such as remote video surveillance (RVS), over ISDN, cable modem, DSL, LAN, wireless networks, etc.
* Multimedia Messaging Services (MMS) over ISDN, DSL, Ethernet, LAN, wireless and mobile networks, etc.
* Multimedia services over packet networks (MSPN), such as multimedia mailing (MMM), etc.

December 9, 2008

IP Video Conferencing

IP based video conferencing is theoretically possible across any IP enabled network, be it the Internet, a Local Area Network (LAN) or Wide Area Network (WAN). There are many reasons why, in practice, video conferencing may not work including: the active baring of video conferencing protocols, the other traffic on the network or delays built up due to the signal having to pass through a large number of devices between users.
IP video conferencing is possible across the Internet but because there is no guarantee of capacity or bandwidth from one end of a link to the other, the results can be unpredictable. The problem is mostly the delay or ‘latency’ inherent in the way the Internet is structured. The Internet uses routing tables defined by the service providers that are optimised for data. Video and audio packets must arrive quickly and in sequence to deliver a video conference and the Internet has no way of doing this. This makes video conferencing across the Internet unsuitable for lessons where a teacher is working with a class and relying on the conference. Internet video
conferencing may be suitable for one-to-one personal links.
The advent of broadband networks between schools is beginning to make IP based conferencing more of a possibility. The greater capacity of a broadband network and the fact that many are privately managed networks can result in more predictable performance although other traffic may still be a problem. The network within a school could also be a bottleneck for video conferences. There will be no guarantee of performance for video conferencing until Quality of Service protocols are implemented on networks (see below). A managed broadband network is not the same as broadband Internet. The problem of ‘latency’with the Internet will still be present with broadband Internet access.
The network LAN within a school can also be used for conferencing just within the site. Many schools are now linked to regional networks such as the regional Grids for Learning - this potentially enables conferencing between schools, to LEAs and other connected institutions such as libraries or ICT centres. On a regional network where firewalls are used, video conferencing protocols have to be enabled to allow conferencing. The network managers may also have implemented a directory service to enable conferences to be established within and outside the grids (see below).
Calling between networks, e.g. from one regional network to another has to be enabled and supported by both networks. The capacity of the link between the networks also has to be considered. Security systems such as firewalls (security devices installed to protect a network)may restrict video conferencing. Some networks have established gatekeepers to control access, these enable users internal to a Grid or network to conference with external users without compromising the security of the network. Conferencing between networks can also be problematic due to the number of devices a call has to pass through, each potentially adding delay to the audio and video stream.

ISDN
(Integrated Services Digital Network)


ISDN is a dial-up service. Once the link is established it is dedicated to that call and is unaffected by other users. This means that the quality of a video conference over ISDN is generally predictable.
There are two main options for the supply of ISDN in the UK: BRI - Basic Rate Interface or PRI - Primary Rate Interface.
BRI is supplied as ISDN 2e, which is 2 x 64kbs channels with an additional signal or control channel. Many schools have or have had BRI ISDN for Internet access prior to the installation of broadband. Most video conferencing units expect BRI ISDN.
PRI is supplied with up to 30 x 64kbs channels in options starting with six channels.
A number of schools and colleges use PRI ISDN for their phone system. Some of these phone installations can be configured to offer BRI ISDN by the addition of internal interface cards. This can be very expensive equipment and it is usually cheaper to get a PRI based video conferencing system and a PRI line with only six channels activated. Contact your phone system installer for details.