Category: network

IT’S TIME TO ABANDON 2.4GHZ

The 2.4 GHz band with the introduction of 802.11n has been so overwhelmed that it is almost completely unusable. The wider 20Mhz channels simply overwhelm the channels originally designed for 802.11b and 802.11g. Notice how overlap from adjacent channels makes such a mess of the signals, Given the interference that 802.11n provides, it’s clear that …

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CISCO DPC3825

The Cisco DPC3825 is a cable modem featuring an 802.11n access point. The product is actually made by Scientific Atlanta but private labeled for Cisco. The Cisco DPC3825 wireless speed is adequate for the gigabit LAN speed. The use of an intranet works properly as well. The upstream port is a standard F type connector …

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WIFI 5GHZ CHANNELS

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CHANNEL BASE FREQ WIDTH 38 5190 5170–5210 40 40 5200 5190–5210 20 42 5210 5170–5250 80 44 5220 5210–5230 20 46 5230 5210–5250 40 48 5240 5230–5250 20 50 5250 5170–5330 160 52 5260 5250–5270 20 54 5270 5250–5290 40 56 5280 5270–5290 20 58 5290 5250–5330 80 60 5300 5290–5310 20 62 5310 5290–5330 …

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802.11N

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802.11n is an amendment to the IEEE 802.11-2007 wireless-networking standard. Its purpose is to improve network throughput over the two previous standards—802.11a and 802.11g—with a significant increase in the maximum net data rate from 54 Mbit/s to 600 Mbit/s (slightly higher gross bit rate including for example error-correction codes, and slightly lower maximum throughput) with …

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SMC SMC8014WN

The SMC8014WN-RES Wireless Cable Modem Gateway is a cable modem with an integrated 4-port router, and 802.11n wireless access point combined into one device to simplfy cable connectivity for all type of users. The Gateway is DOCSIS 2.0 compliant to ensure interoperability with existing cable systems. It supports VPN pass through connections with PPTP, L2TP, …

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CISCO AIRONET 2600

CISCO AIRONET 2600

The Cisco Aironet 2600 Series Access Point is BYOD-optimized for connectivity to any client device. Second only to the Cisco Aironet 3600 Series in performance and features, the Cisco Aironet 2600 Series sets the new standard for enterprise wireless technology. This mission-critical access point delivers Cisco’s RF excellence features such as Cisco CleanAir and ClientLink …

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MICROSOFT MN-700 WIRELESS 802.11G BASE STATION

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 The Microsoft MN-700 is a 802.11g access point. It is designed for 802.11b and 802.11g connections at 2.4 GHz only, there is no support for 802.11a which uses 5 GHz. Intelligent software automatically detects your Internet service and modem settings for easy base station configuration Commercial-grade, built-in hardware Stateful Packet Inspection (SPI) firewall and Network …

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802.11G

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IEEE 802.11g-2003 or 802.11g is an amendment to the IEEE 802.11 specification that extended throughput to up to 54 Mbit/s using the same 2.4 GHz band as 802.11b. This specification under the marketing name of Wi-Fi has been implemented all over the world. The 802.11g protocol is now Clause 19 of the published IEEE 802.11-2007 …

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LINKSYS WRT54G WIRELESS-G ROUTER

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The Linksys WRT54G is a low cost 802.11g access point. The WRT54G supports 802.11b and 802.11g at 2.4 GHz. The WRT54G does not support 802.11a which operates at 5 Ghz. Advanced wireless security with 128-bit WEP encryption, MAC, or IP address filtering Interoperates with 802.11b clients at 11 Mbps Wireless data rates up to 54 …

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802.11B

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IEEE 802.11b-1999 or 802.11b, is an amendment to the IEEE 802.11 wireless networking specification that extends throughput up to 11 Mbit/s using the same 2.4GHz band. A related amendment was incorporated into the IEEE 802.11-2007 standard. 802.11b is the most widely used in the US and EU however many dual band adapters and access points …

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802.11A

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IEEE 802.11a-1999 or 802.11a was an amendment to the IEEE 802.11 wireless local network specifications that defined requirements for an orthogonal frequency division multiplexing (OFDM) communication system. It was originally designed to support wireless communication in the unlicensed national information infrastructure (U-NII) bands (in the 5–6 GHz frequency range) as regulated in the United States …

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WIRELESS GAMING

The advantages of wireless at a LAN party are obvious. Players can bring their rig down to play in tournaments and over the years many such parties have been run. Some have attracted over 1000 players. The popular 802.11n is now slowly being replaced by new 802.11ac hardware. New 802.11ac access points are completely backwards compatible …

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YMODEM

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YMODEM is a file transfer protocol that is similar to the earlier XMODEM with larger block sizes and intrinsic CRC error detection. YMODEM was first seen in the YAM program for CP/M in 1985 which is 4 years after the introduction of the IBM PC. CP/M machines in 1985 were much less expensive. The original …

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COMPUTER BULLETIN BOARD SYSTEM

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The Computer Bulletin Board System (BBS) got its start back in 1978 when a brutal snow storm paralyzed the city of Chicago. It was developed by Ward Christianson and Randy Suess. The system came into existence largely through a fortuitous combination of Christensen having a spare S-100 bus computer and an early Hayes internal modem, …

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XMODEM

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XMODEM is a protocol to transfer files from one machine to another. It originally was published by Ward Christensen on October 10, 1977. This program is sometimes called MODEM or MODEM2. The program is written in Z80 Assembler. The code runs as a module on CP/M based machines. This code was revised after a few …

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