UFB and CIR

Education UFB services come under 3 main fibre template types as follows:

  • Bitstream 2 - Either 30Mbps/30Mbps or 50Mbps/50Mbps with 10Mb CIR.
  • Bitstream 3a - Either 100Mbps/100Mbps or 1Gbps/1Gbps with 10Mb CIR.
  • Bitstream 4 - Either 100Mbps/100Mbps or 1Gbps/1Gbps with 10Mb CIR.

So taking a basic look at the above the only real difference appears between the Bitstream 2 and the 3a and 4 services is the connection speed.

The differences between the products are as follows:

Bitstream 2
Limited by Access speed either 30Mb or 50Mb as above. This product has only two classes of service "High Priority and Low Priority". To use the High Priority CIR on the base services you will need a firewall / router / switch capable of tagging your high priority traffic like VoIP to use the 10Mb CIR. If your high priority services being tagged exceed the 10Mb then any data over this 10Mb will be discarded.

  • There is no CIR / EIR (Committed / Burst) type service on the Bitstream 2 product. You need to mark your high priority traffic and you cannot exceed this otherwise.

Bitstream 3a
Limited by Access speed either 100Mb or 1Gb as above. This product has three classes of service which is the main differentiation from Bitstream 2. These classes are "High Priority CIR", "Low Priority CIR" and "Low Priority EIR".

The service will allow your RSP to build a more traditional CIR (committed) with EIR (burst) service.

eg; As an RSP I can choose to have a service as follows:

  • 100Mb Access (Line Speed)
    10Mb High Priority CIR (Committed Bandwidth) - Use this for traffic like VoIP.
  • This leaves me with 90Mb of bandwidth. Now as an RSP I could choose the following:
  • 50Mb Low Priority CIR
    40Mb Low Priority EIR
  • What this in effect will means is that with the remaining 90Mb on this connection I can create a committed with burst type connection for all other Internet traffic or data.
  • Low Priority CIR will always take 2nd place below High Priority CIR but will always have a higher precedence over Low Priority EIR.

Bitstream 4
This is a high grade bandwidth connection. You can purchase either 100Mb or 1Gb Access speed and you choose the bandwidth eg; 10Mb / 100Mb etc.

You do not need to mark or tag any of the traffic and the limit is the bandwidth you choose to put onto the connection.

  • This type of service would also be used for more complex WAN services such as inter-site private services etc and not just Internet connectivity.
  • So to hopefully sum this up, you can use the Bitstream 3a service to build a burstable type service.
  • Your RSP however will need to specifically build a template to do this.
  • All of the UFB services currently being deployed by RSP's are the basic packages from the LFC's with no customisation.
  • To eventually not succumb to the over-subscribed basic services with more RSP's / ISP's you will need to look at the packages and understand what type of connectivity you are receiving.