The port itself can handle up to 256K; that's the port speed. You're paying for 64K (CIR), which is what you'll get on average. You will occasionally burst up to 256K when there is no other traffic on the circuit (it is shared bandwidth with other frame relay subscribers). This bursting is figured into the pricing (remember, you'll average 64K throughput, even though you may not get exactly 64K all the time). If you burst over your CIR for more than your alotted time slot (remember, they expect you to burst every once in a while) your packets will be marked as discard eligible and will be preferencially discarded if another customer is trying to transmit within CIR, such that the port would not be able to handle your extra data (you'll be relegated back to your own CIR). The pricing can be done differently, depending on the carrier. Some will bill you for your CIR plus any actual usage above CIR. Others allow you to burst up to the maximum available bandwidth as long as there is no other traffic for no extra charge. There's also a new animal on the frame relay front called 0-CIR, which means you don't elect a CIR at all, and pay only for actual usage.
If this has been completely confusing, then the telco has done their job well. I think half the time they actually want their customers not to understand their pricing. Anyway, pardon my kvetching. =)
Hopefully the technical details are helpful to you.
- Don
-----Original Message-----
From: Rayappa Mayakunthala [mailto:[EMAIL PROTECTED]]
Sent: Monday, November 20, 2000 11:23 PM
To: [EMAIL PROTECTED]
Subject: on Frame Relay
Folks
I have couple of questions on Frame Relay. When they say CIR is 64Kbps and
the port is 256Kbps in a 64/256 FR link, what does that mean? Do I get CIR
all the time and do I also get the port bandwidth all the time? How does
this work? Do the service providers have the port bandwidth for each link or
it is shared across? How does the pricing work, if somebody bursts upto the
port speed all the time, does he get billed more?
Cheers,
Rayappa.
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