Archive for the ‘WAN’ Category
July 13th, 2008 | 
Author: Wide Area Networks and FRAME RELAY
Frame Realy is the #1 WAN technology worldwide.
Used by all sizes of customers because the Total Cost of Ownership is flexible.
Frame Relay reduces costs by using less equipment, less complexity, & easier implementation than leased lines. It also provides greater reliability, & resilience.
COST EFFECTIVENESS
Frame Relay solutions provide cost effectiveness & flexibility.
With dedicated lines, customers pay for an end to end connection including the local loop & network link.
1.With frame relay you pay for the local loop & for bandwidth.
The Distance between nodes isn’t important.
Lease lines – increments of 64kbs Frame Relay VC(Virtual Connection) are defined with greater granularity, increments as small as 4kbs can be used.
2.Frame Relay is also cost effective in that it shares bandwidth across a larger base of customers.
Using dedicated lines require more DSU/CSU & more complicated routing & switching
Tags: 802.1q, router, guides, vlan, wan, ip
Prepare your router for the Wide Area Network.
Cisco devices use HLDC encapsulation by default.
Serial COMMUNICATION
Serial connections send 1 data bit at a time when transmitting.
Parallel Connections send multiple bits simultaneously.
Theoretically an 8 bit parallel bus, transfers data 8X faster.
Serial connections can be clocked much faster than parallel links.
2 of the main factors that affect parallel communication are clock skew & cross talk.
Clock skew – some parallel bits arrive later than others.
Overcoming clock skew is difficult & involves clocking.
Cross-Talk – crosstalk normally refers to a signal affecting another nearby signal.
Tags: study, ip, 802.1q, wan, vtp, vlan