After get understanding on E1 Carier System, Frame Relay is part of the related topic which play a big role on E1 Careir System

Frame Relay is a simplified form of connection-based, packet-switching service in which synchronous frames of data are routed to destinations indicated on the header information. Frame Relay assumes an error-free physical link and therefore does not guarantee data integrity. Error detection and correction responsibility is left with the end devices.

Frame Relay uses the synchronous High-level Data Link Control (HDLC) frame format up to 4096 octets in length. Each frame contains a start flag, two octets that contain the information required for multiplexing across the link, the data information (payload), two octets generated by a cyclic redundancy check (CRC) of the rest of the octets between the flags, and the end flag.

Permanent virtual circuits (PVCs) are used to form a connection between any two devices attached to a Frame Relay cloud. Virtual circuits are logical, bidirectional, end-to-end connections that appear to the user as dedicated links. Each PVC is given a unique number on each physical circuit along the path between the two devices. (more…)

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What hot on this issue:

1. Reviewed on the new iPod Shuffle
2. Unlimited iPhone Guide, 25 top tips and tricks
3. First Look on iPhone 3.0
4. How to Shoot and Edit hight-def video
5. and much more on Mac related information and news

Download MacWorld Magazine for June 2009 here (more…)

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What hot on this issue:

1. Freedom of choice: SHould you buy and unlocked Phone?
2. Turn your wii controller into a mouse
3. Thing you didn’t know your hardware could do
4. Turn your blackberry into an internet radio
5. Turn your netbook into a Mac notebook
6. All in one color laser printers include lap tested (Smarter Cheaper MFPs)
7. HD Camcorders in your pocket, five mini videocams go head to head

Download PC World Magazine For June 2009 here (more…)

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Apologize to my readers, last month was not much time to manage my blog, and did not post up any e-magazine, hopefully before the month end, I able to post up few computer magazine here. Let see what this month Linux Magazine will show?

What hot this issue:

1. Waiting for the Android Effiect
2. Run Linux Inside Windows
3. 5 Operating SYstem that can set you free
4. PC-BSD, PC Linux OS, Pardus, Dreamlinux, & Simply MEPIS reviewed, Want to try them?
5. Accidentally delete files? Recover Easily
6. How to configure tablet, Digital Pen
7. Automate Work with OOo Macros
8. Contain Linux Instances with OpenVZ
9. Balance traffic across data centres with LVS
10. Develop Interactive Web Pages with JQuery

Download Linux Magazine for May 2009 here (more…)

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While study on the radio system during my working hour, found that the system here are using normal Ethernet cable to connect the main system  to the Base Station. Normally an Ethernet cable maximum transmission distance are not recommended to be more the  100 Meter.

According to the senior engineer over there, if the base station located far away from the main system, they normally using fiber optic or some other medium such as wireless, antenna in special frequencies or E1 line from ISP.

An E1 carrier is a telecommunications facility designed to carry digital information at a bit rate of 2.048 Mbps. In conventional telecommunications, the most common use for an E1 carrier is to connect central offices within an individual telephone company. Telephone companies also lease E1 carriers to their customers for their own private purposes. Most systems use E1 circuits to transmit digitized voice, management, and control traffic between zones. The Frame Relay and Cell Relay protocols provide the means for exchanging information over the E1 communication facilities that connect remote zones.

Various types of transmission media can be used in implementing a private E1 facility, (more…)

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