Quality Of Service Issues - Nortel Remote Gateway 9110 Reference Manual

Standard 1.6

Quality of service issues

The following section discusses ways that the Remote Gateway 9100 Series
product works to resolve Quality of Service (QoS) issues involved in
transmitting VoIP.
QoS Transitioning Technology
When voice quality degrades on your Remote Gateway 9100 Series network, the
RLC provides improved QoS. Nortel's patented QoS Transitioning Technology
enables the RLC to move Remote Gateway 9100 Series calls from the IP
network to the PSTN. The more stable PSTN provides improved QoS until IP
network QoS improves.
Once the IP network QoS improves, the RLC automatically recovers Remote
Gateway 9100 Series calls to the IP network. For detailed information on how to
configure QoS Transitioning Technology thresholds, refer to the Reach Line
Card Installation and Administration Guide (NTP 555-8421-210).
Note: Because Digital Telephone IP Adapter units do not have PSTN
connectivity, they do not support QoS Transitioning Technology.
How QoS Transitioning Technology works
QoS Transitioning Technology bases transition and recovery functions on the IP
network's QoS level. The QoS level is a user-oriented metric that takes one of
ten settings. You identify the limits of acceptable voice QoS for each remote site
in your Remote Gateway 9100 Series network by choosing from among those
settings using Remote Gateway 9100 Series Configuration Manager graphical
user interface (GUI). The Meridian digital telephone set at the remote location
and the RLC in the host PBX communicate with one another over the IP
network. These communications begin with a 10BaseT Ethernet interface to the
corporate intranet.
28 Remote Gateway 9100 Series Network Engineering Guidelines
June 2005