|
Cisco�s 815 Cable Integrated Services Router � �One Box Can See Farther Than Two�
An Animated Article by Thomas B. Cross � TECHtionary.com and Ciscopedia.com
This animated tutorial can be found at:
www.ciscopedia.com or http://www.ciscopedia.com/techtip/cisco-isr.swf
This is a review of the Cisco 815 Cable Integrated Services Router (ISR) and Cisco High-Speed WAN Interface Cards (HWIC-CABLE-D-2 and HWIC-CABLE-E/J-2). Integrated switch routers and high-speed area network interface cards which greatly expand and simplify cable operators' business service offerings for small to medium-sized businesses (SMBs) and enterprise branch offices. In a "two-box" network environment, the premise router can only look to the cable modem but not "look ahead" to see network congestion which limits QoS. Data networks are called "bursty" networks because data arrives randomly and in large amounts often causing "traffic jams." In a "one box" environment such as the Cisco 815 Cable Integrated Services Router (ISR) and Cisco High-Speed WAN Interface Cards (HWIC-CABLE-D-2 and HWIC-CABLE-E/J-2) enhances QoS by �looking ahead" into the network prioritizing traffic accordingly. QoS is critical to business VoIP-Voice over Internet Protocol or IPT-Internet Telephony as any congestion can cause "stutter" delays, "voice skips" from packet loss or "jitter" in the conversation.
Adding bandwidth is a nice but expensive solution to avoiding voice/data "log jams" and VoIP "stuttering" problems. Network routers like the Cisco ISR, network optimizers and equalizers are hardware software devices that give the network administrator control over every type of packet and TCP port. The advanced security features of the Cisco 815 ISR include capabilities such as hardware-based virtual private network (VPN) acceleration, firewall and intrusion prevention. These and other techniques are critical as video, gaming, video mail and other complex systems such as virtual reality emerge.
One of the key advantages of the ISR is providing both a traditional T-1 circuit and a cable ethernet solution for routing. Either circuit can be the primary routing circuit, however, in case of circuit failure; alternate circuits can be selected automatically. In addition, protocols like HSRP-hot Standby Routing Protocol can be implemented for additional protection.
Network equalizing is the balancing of traffic allowing for time-sensitive (delay-sensitive) voice, video and streaming data to receive an "equal share" of the available bandwidth. Network equalizing is a dynamic process which can respond to changes in network conditions. In addition, as more and more applications are placed on the network, network equalizing is critical to "filling the pipe" and not paying for idle bandwidth.
ABOUT
TECHtionary.com produces VoIP dealer sales and customer training programs, online presentations including iPod and PC formats sales brochures, virtual installation manuals and animated online presentations. The company has more than 2,816+ free online presentations on data communications,, internet, wireless, VoIP-Voice over Internet Protocol, PBX Systems, central office switching, protocols, telephony, telecommunications, networking, routing, IPTV, WiMax, power systems, broadband, WiFi-wireless fidelity and other related technologies available at http://www.techtionary.com. Thomas Cross is a magazine columnist with many key technology publications and a member of the Technical Board of Advisors for the VoIP-Security Alliance. He can be reached at 303-594-1694, or cross@gocross.com
[ Back To TMCnet.com's Homepage ]
|
INDUSTRIES
Activate Email 
Find Solutions for Enterprises, SMBs & Service Providers at the INTERNET TELEPHONY Conference and EXPO East, January 20-22, 2010. Miami, FL.
