# GGSN QOS

The GGSN QOS dialog box lists the quality of service (QoS) parameters of a GGSN in a GPRS system.

Note: This dialog box is available only if the value of cGtpGSNService is set to ggsn.

## Navigation

1. Right-click the Multi-processor WAN Application Module (MWAM) and then select Configure, or double-click the module.

2. Select MWAM module from the Category drop-down box.

3. With a device selected in the MWAM module dialog box, click Configure.

4. Select GGSN QOS from the Category drop-down box.

The following information is displayed:

> QoS Method Type (cggsnQosMappingMethod)

> Bandwidth Resource (cggsnQosTotalBandwidthResrc)

> Deviation Factor (cggsnQosPremiumMtDeviationFactor)

> Bandwidth Factor (cggsnQosBestEffrtBandWidthFactor)

> DSCP Status & Path (cggsnQosUmtsDscpUnmodified)

Note: The last four objects are available only if the value of cggsnQosMappingMethod is set to canonical.

### QoS Method Type (cggsnQosMappingMethod)

Type of QoS method mapped to GPRS QoS. There are three possible values:

> canonical

> delay

> none (best-effort)

### Bandwidth Resource (cggsnQosTotalBandwidthResrc)

Total amount of bandwidth resource on the GSN. The total depends on various factors such as system throughput, memory size, and maximum number of PDP contexts supported. A portion of the total resources is allocated to a user at the time of PDP context activation, based on the user's QoS class. This object can be retrieved only if the value of cggsnQosMappingMethod is set to canonical(2).

### Deviation Factor (cggsnQosPremiumMtDeviationFactor)

Mean throughput deviation factor used by the GGSN to calculate the data throughput that is allowed for premium QoS. This object can be retrieved only if the value of cggsnQosMappingMethod is set to canonical(2).

### Bandwidth Factor (cggsnQosBestEffrtBandWidthFactor)

Bandwidth factor to be applied to canonical best-effort QoS class. This object can be retrieved only if the value of cggsnQosMappingMethod is set to canonical(2).

### DSCP Status & Path (cggsnQosUmtsDscpUnmodified)

Indicates whether the DSCP in the subscriber datagram is modified before it is forwarded in the uplink/downlink path.

There are four possible values:

> up(1): DSCP will not be modified in the uplink path.

> down(2): DSCP will not be modified in the downlink path.

> all(3): DSCP will not be modified in either the uplink or downlink path.

> none(4): DSCP will be modified in both the uplink and downlink path.