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The 10BASE-5 Ethernet topology (also known as thicknet) is the original full specification variant of Ethernet cable, using coaxial cable (RG-8 in comparison with RG-58 used by 10BASE-2). The RG-8 coaxial cable used by 10BASE-5 network uses beside external transceivers 15-pin AUI D-type connectors. Also, the cable has an impedance of 50 ohms and includes multiple shielding.

The RG-8 coaxial cable has a yellow to orange cover made out of fluorinated ethylene propylene (used mostly for safety since it is fire resistant). Even more, the RG-8 coaxial cable is usually known as the yellow cable. The 10BASE-5 Ethernet topology was superseded, mainly because of the demand for high speed networking, and the increasing popularity of 802.11 wireless networks.

The 10BASE-5 name is derived from three characteristics of the physical medium. The BASE stand for baseband signaling (opposed to broadband), the 10 comes from the speed of the transmission, which is 10 MB per second, while the 5 in the 10BASE-5 refers to the characteristic of the topology, capable of carrying signals five times 100 meters, reaching a maximum value of 500 meters.

10BASE-5

The 10BASE-5 Thick Ethernet has several limitations. First the maximum transceiver cable length is limited at 50 meters, while the minimum distance between transceivers is limited to 2.5 meters. While the maximum number of trunk segments was limited to five, the maximum trunk segment length was 500 meters and the maximum network trunk cable could only reach 2500 meters. Each end of the trunk segment is terminated in 50 ohm. While the connectors’ splices are kept to minimum, one of the terminators is grounded.

10BASE-5

The 10BASE-5 cable is developed specifically to allow transceivers to be added while existing connection are ongoing. However, in order to achieve this, the vampire tap was used. The vampire tap is a device which clamps onto the cable, forcing a spike to pierce through the first layer in order to contact the inner conductor while other spikes bite into the outer conductor. However, the vampire tap device is usually embedded into the transceiver, while another multi-wire cable sustains the connection between the node and the transceiver.

10BASE-5 standard

The maximum number of stations on a trunk segment (equivalent with maximum number of nodes that can be connected on a 10BASE-5) is limited to 100. The transceivers connect the nodes via AUI (also known as Attachment Unit Interface). The Attachment Unit Interface uses a 15 way two row D-style connector. However, this D-style connector lacks the normal screws for cable restrains but includes clips.

Refinement is the key word. Unfortunately, Acer has gone a little further and a little too stripped the machine. No no numeric keypad, minimalist connectors (one VGA, 3 USB, 1 RJ45), no e-SATA connectors, FireWire, webcam or memory card reader. The price is pulled down and not without consequences. Almost all of the shell is dull (which we will not complain) with the exception of a bright band on the back of the machine.
Closed, the computer is much more beautiful than open. This is due to the beige plastic used for the keyboard and outlined all of which is not very aesthetic. In terms of multimedia keys, only the sound control is proposed. The index of vista machine is undermined by the graphics: 3.0. In detail, the components are rated as follows: CPU: 4.2 – RAM: 4.5 – Graphics: 3.0 – Thu: 3.4 – main hard disk and 4.8. As usual, this index is not talking and I invite you to visit the benchmarks you better realize that this PC has in its belly.

Forget multitasking right away. Return to a single core with dual core use in everyday life is taking some nasty habits. Open windows for other facilities, surfing etc.. And then it does not miss, the machine stops responding or slows down extremely. The solution: stop run applications in parallel and return to the single task.  This is not a surprise, the Aspire 5315 is not a racing machine. On all our indicators, he finds himself, at best, 24% behind our computer referent: Asus M50SV. The biggest impact is on the video compression and it is three times slower.

The lack of devices reduced this part to a trickle. No webcam or memory card reader. We obviously regret this gap, but it must be said that this will greatly help us. At independence, the Aspire 5315 is rising to the height of his claims (see news announcement) is 1:52 in movie playback. It’s 10 minutes longer than the Asus M50SV but far behind the 13 and 12 inch all end up beyond 2 hours of use on battery.Video, The most troublesome aspect is the video of the glossy tile. Beyond this point, once calibrated the screen (profile available on the Focus-Digital). The tingling is not very present and the blacks are doing what they can (washed in all). The colors are generally warm. Playing a Blu-Ray with the software Power DVD Ultra. The film starts, however, even if the sound is not ground, fluidity is not there. The processor is used to its maximum capacity and to ensure continuous playback, is “jumping” a large number of images.

This part closes with the sound like. This is not the forte of the Aspire 5315. The maximum volume of the speakers is not powerful enough. The use of headphones is strongly recommended.

The design of ASRock F14 is surprising. The chassis uses a matte black plastic, inlay small flakes. This remains sober, just like Samsung did on these models. In contrast, the entourage and the computer’s screen is made of a shiny black plastic, very flashy (like Asus UL80), which easily takes fingerprints and dust. The mixture is not too bad, but we can not help thinking that this would have been better with a plastic mat also for the screen. Otherwise, the machine is massive enough, despite a 14-inch screen. The set is quite sturdy, with hinged screen that appear sound.

The keyboard is a model for flat keys (17 x 17 mm). Typing is very flexible and comfort is very good, much better than the M15 from the same manufacturer. Above the keyboard, one key is used to disable the touchpad while the other manages the activation of these Wi-Fi keys are not very practical, since we still support it (loudly), while one might think they are sensitive. We would have preferred real keys separate from each other in this case. The multi-touch touchpad is a good size and is well integrated into the hull. Its matte surface provides a comfortable glide and accuracy is the rendezvous. The bar clicks, situated below, is average. The left click is less reactive than the right, and its shiny surface “mirror effect” takes fingerprints.

Asus UL80V webcam image is correct. The burned areas are overexposed and she needs a high enough brightness to function properly. The fluidity is good. The microphone is placed to the right, which is better suited as a location next to the keyboard (like on the M15). The sound is okay. Play 3D games not good for a few greedy, The integrated graphics are largely insufficient to expect to play 3D games lately.

You will simply 2D games or old games with 3D graphics limited details.Audio: helmet compulsory, The F14 is the speaker located under the screen, which is never a good sign. Indeed, the sound is totally flat, dry, without serious, with a predominance of acute. Instead, use the headphone output, although more correct despite a slight wind.

Mobility, Autonomy: small battery = limited autonomy, The battery of 4400 mAh is certainly an economic choice on this machine. Autonomy is correct for the class, with 2:37 to play video (screen at 100 cd / m², headphones plugged and Wi-Fi turned off).

The M15 from the same brand, with a larger screen and a very similar setup, takes 10 minutes less.From a mobility perspective, the F14 is more like a classic notebook with an ultra-portable, despite a 14-inch screen. The weight remains correct, with 2.1 Kg However, the most nomadic of us prefer a more compact model.

Multimedia is honored with the netbook ASUS Eee PC 1201N. Behind an appearance similar to other netbooks brand lies a configuration atypical and unusual. The 1201N is indeed equipped with an Intel Atom dual-core, and the famous NVIDIA ION significantly increases the possibilities of the machine.
Handling, ergonomics: a brilliant mind abuse. Like the Eee PC 1101HA, the Eee PC 1201N uses the same shiny black dress. Although the result is quite elegant, we can not miss the (too) many fingerprints that inevitably dot the machine. This flooring is beautiful when clean but very messy when used in current, which is ultimately unpleasant. The finish is very good, while the strength seems to be an appointment with a rigid machine and has a sturdy screen hinge.  Asus Eee PC 1201N Keyboard. The keyboard type chiclet “occupies the entire width of the machine and consists of small flat buttons (15 x 14 mm) and well spaced. Typing is fairly strong, quiet and comfort is very good.

The touchpad (multi-touch) blends with the rest of the hull and noticed only by the presence of small spikes that stand out. Although touch is, therefore, a little special, gliding is fast and accurate. The bar clicks is all chrome and lies just below the touchpad. The quality is good, but the clicking noise is still quite present. Asus Eee PC 1201N webcam image is correct. The colors are well rendered and the fluidity is good.

In contrast, overexposed areas are burned, and the result is difficult to use in low light conditions.
Despite a configuration more robust than the average netbook, the Asus Eee PC 1201N remains discreet. Much of the time we just hear a slight breakdown. The murmur increases only for treatments heavy photo or video.

The connector is standard, with 3 USB 2.0 ports, 1 HDMI, 1 VGA, 1 headphone, 1 microphone, 1 RJ45, 1 memory card reader and a 2 port lock. Wi-Fi b / g / n is also present, as well as Bluetooth. On the PC, only one trap is present and allows access to the RAM. The two sites are occupied by a module of 1 GB each. The battery is removable and only slightly exceeded by the machine.

Despite the presence of two hearts, the processor 1201N is not enough to decode only the videos in high definition. In spite of its CPU stays around 80% the flow is not at the rendezvous. Fortunately ION chipset is there and can relieve the CPU of this work. The hardware acceleration is enabled to take advantage of the excellent decoding capabilities of the graphics NVIDIA. The CPU usage then goes to 11%, while consumption falls to 30.5 Watts (33 Watts otherwise, and 20 watts in standby).

Audio: headphone only passes the test. The sound from the loudspeakers of the machine is bad. Lack of depth (not low) and predominance of high frequencies. It’s classic on netbooks. Only the headphone output is correct, since it has the merit of being devoid of breath and parasites. Mobility, Autonomy: the big battery saves the day. Reading the specifications of this netbook, it was feared the worst for autonomy. Fortunately, the result is more satisfactory than expected, with still 3:35 in the video playback (Wi-Fi off, and headphones plugged brightness 100 cd / m²).

Hewlett-Packad announces a range of new laptops, for the general public the opportunity to confirm the launch of the next Envy 14 and Envy 17. For months, rumors were running on the release of new laptops Inorder to 14 and 17 inch sizes. This rumor is no longer one since HP announced the Envy 14 and Envy 17. They work under both Intel Calpella platform with a dedicated graphics card ATI Radeon Mobility. No technology Nvidia Optimus. These phones are also equipped with an optical drive, a webcam HD, a mini-DisplayPort, a wireless connectivity, a backlit keyboard chiclet well as much audio through Technology Beats Audio. They enjoy an elegant finish similar to previous Envy.

The 14 HP Envy has a 14.5”screen up to 59% brighter than a conventional screen. This is according to the brand of one of the finest models and proposed lightweight Quad Core. Its maximum range is quoted to 13.45 and may include an optional 3G module. It has HDMI, Headphone, Microphone, Ethernet and USB (x3). The 17 HP Envy is characterized by a size 17 inches. He enjoys technology Eyefinity to support multiple external displays and the HP Triple Bass Reflex Subwoofer audio side. It can support up to 2TB (2000GB) of storage space and has a Radeon Mobility HD 5850. The processors are available for Core i5 and Core i7.

Side connections, we will find HDMI ports, VGA, Headphone, Microphone, Ethernet and USB (x4). Its keyboard has a numeric keypad. This laptop is expected next May 26 in the United States from U.S. $ 1399.99 while the HP Envy 14 should land him across the Atlantic from June 27 to $ 999. The HP Pavilion DM4 it is announced for May 19 in the United States from 729.99 dollars with an Intel Core, a 14-inch BrightView screen, an optical drive, a fingerprint reader, a range of 6.30, a weight of 1.99 kg and a thickness of 25mm.

It can be optionally equipped with an ATI graphics card and has a maximum storage space of 640 GB as well as options for GPS modules, Bluetooth and 3G.This model incorporates ports VGA, HDMI, Ethernet, Headphone, Microphone and USB (x4) and a flat keys.

The new HP Pavilion dv5 (14.5 inches), dv6 (15.6 inches) and dv7 (17.3 inches) are the ones advertised from 649.99 dollars, 649.99 dollars and 799.99 million respectively, again to May 19 Under AMD and Intel platform, they will be available in several colors and support Quad Core processors and 1TB of disk space limit for the first two (2 TB for the dv7).  The Pavilion dv6 can embed a dedicated graphics card option premium as the Pavilion dv7 (ATI). Finally, the HP Mini 210 announced two new designs: preppy pink (pink) and white crystal (white). Unfortunately, the battery does not look for better integrated and more than happily chassis. The HP Mini 110 netbook entry level, it displays a range of eight hours with its 6-cell battery.

These Netbooks Mini 210 and Mini 110 will arrive  in June 15 overseas and $ 354.99 respectively at 279.99 dollars.