# GGSN QOS

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

Note This dialog can be viewed if cGtpGSNService is set to 'ggsn'.

## Procedure

1. Right-click the device and then select Configure, or double-click the device.

2. Select GGSN QOS from the Category list.

The following information appears:

QoS Method Type (cggsnQosMappingMethod)

Bandwidth Resource (cggsnQosTotalBandwidthResrc)

Deviation Factor (cggsnQosPremiumMtDeviationFactor)

Bandwidth Factor (cggsnQosBestEffrtBandWidthFactor)

DSCP Status & Path (cggsnQosUmtsDscpUnmodified)

Note The last object can be viewed if cggsnQosMappingMethod is set to UMTS.

### QoS Method Type (cggsnQosMappingMethod)

Type of QoS method mapped to GPRS QoS. QoS method can be:

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 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 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 cggsnQosMappingMethod is set to canonical (2).

### DSCP Status & Path (cggsnQosUmtsDscpUnmodified)

Checks if the DSCP in the subscriber datagram is forwarded in the uplink or downlink path with or without modification.

Values are:

- up(1) - DSCP is not modified only in the uplink path

- down(2) - DSCP is not modified only in the downlink path

- all(3) - DSCP is not modified in both the uplink and downlink paths

- none(4) - DSCP is modified both in uplink and downlink paths