Make your own free website on Tripod.com

ABDO ELGAMAL WEB PAGE
VSAT SECTION

BOD(Bandwidth On Demand)


(*)A General review on how the system works:
-Explaning how connection is established between two voice or data cards in two remote site:-

1st if the voice card was connected to telphone and it is picked up and a number is dialed ,the voice card will send a call request to the csc responsble for him.Then the csc will send the request with the called number on the IB channel to the CSC/PDC in the hub.The PDC will check if the called adress is not busy and if there is enough bandwidth in the freqency pool.If every thing is ok it sends on the OB channel to CSC at calling and called remote sites to make a link between the specified two voice cards on a specified channel .
After the call is finished the same thing is doing to free the channel in the DAMA POOL and making it accesable for another link.

Connection modes:-

1)Point To Point:-Full duplex sattelite channel will be assigned between two dedicated points.
2)Broad Cast:-one transmiter N reciever can be specified.
3)One Way:-Half duplex sattelite channel will be assigned for one transmitter and one reciever.

Different modes that BOD offers:-

1)DAMA:-channels are assignd upon request based on the first come-first served.
2)Sceduled DAMA:-With the scedule table with in NMS(Network management system),NMS will automatically assign sattelite resources to the reserved application in the table.
3)PAMA:-At spicified time in the day,sattelite resources will be assigned to the reserved permenant application.

For more advanced information about BOD CLICK HERE


Space Segment| Earth Segment|BOD System| TDMA System| VSAT Main Page| Retun Home

Important links to me:-
Visit my Nice Page
MY EDUCATION

ABDO ELGAMAL WEB PAGE