Note: Service Classes is a function that is applicable to Cable mode only.
To create a service class:
- From the Policy Server section of the navigation pane, select Service Classes.
The content tree displays the Service Classes group.
- Select the Service Classes group.
The Service Class Administration page opens in the work area, listing available service classes.
- Click Create Service Class.
The New Service Class page opens.
- Enter the following information:
- Name — The name assigned to the service class.
- Scheduling Type — Select from the following:
- Downstream (default) — Defined through a similar set of QoS parameters that are associated with the best-effort scheduling type on upstream service flows. Appropriate for all downstream service flows.
- Best Effort — Transmission opportunities are granted on a first-come, first-served basis. Appropriate for upstream service flows such as Web browsing, e-mail, or instant messaging.
- Non Real Time Polling — Cable modems are polled at a fixed interval for queued data. Appropriate for upstream service flows that require high throughput, and traffic that requires variable-sized data grants on a regular basis, such as high-bandwidth FTP.
- Real Time Polling — Cable modems are polled at a fixed but short interval for queued data. Appropriate for upstream service flows of real-time traffic that generate variable-sized data packets on a periodic basis and have inflexible latency and throughput requirements, such as MPEG video.
- Unsolicited Grant Service — A fixed-size grant is offered to service flows at fixed intervals without additional polling or interaction. Appropriate for upstream service flows of real-time traffic that generate fixed-size data packets on a periodic basis, such as VoIP.
- Unsolicited Grant Service with Activity Detect — When there is activity, the CMTS sends unsolicited fixed grants at fixed intervals to the cable modem. When there is no activity, the CMTS sends unicast poll requests to the cable modem to conserve unused bandwidth. Appropriate for upstream service flows that include silence suppression.
- Maximum Traffic Rate (bps) — The maximum sustained rate, in bits per second, at which traffic can operate over the service flow.
Enter an integer between 0 and 4294967295.
This field applies to the Downstream, Best Effort, Non Real Time Polling, and Real Time Polling scheduling types.
- Minimum Reserved Rate (bps) — The guaranteed minimum rate, in bits per second, that is reserved for the service flow.
Enter an integer between 0 and 4294967295.
This field applies to the Downstream, Best Effort, Non Real Time Polling, and Real Time Polling scheduling types.
- Unsolicited Grant Size (bytes) — The size, in bytes, of the individual data grants provided to the service flow.
Enter an integer between 0 and 65535.
This field applies to the Unsolicited Grant Service and Unsolicited Grant Service with Activity Detect scheduling types.
- Nominal Grant Interval (usecs) — The nominal interval, in microseconds, between successive unsolicited data grant opportunities for this service flow.
Enter an integer between 0 and 4294967295.
This field applies to the Unsolicited Grant Service and Unsolicited Grant Service with Activity Detect scheduling types.
- Grants per Interval — The actual number of data grants given to the service flow during each nominal grant interval.
Enter an integer between 0 and 127.
This field applies to the Unsolicited Grant Service and Unsolicited Grant Service with Activity Detect scheduling types.
- Click Save.
The service class is defined in the CMP database and can now be used in a policy.