Quality Of Service Transitioning Technology - Nortel Remote Office 9150 Installation And Administration Manual

September 2001

Quality of Service transitioning technology

Communications between the Remote Office 9150 unit in your office and the
host PBX take place across the IP network using a 10BaseT Ethernet interface.
You can configure the Remote Office 9150 unit to switch automatically from the
IP network to the PSTN when the voice QoS falls below a predetermined
threshold. Within the QoS settings you can also enable Differentiated Services
(DiffServ) and 802.1p mapping to give priority to voice over IP traffic on your
network.
Both the RLC and the Remote Office 9150 unit monitor the IP network's QoS
constantly. If the IP network QoS degrades, causing poor voice quality, the
Remote Office 9150 unit moves, or transitions, the call to the PSTN. When the
QoS returns to normal, the Remote Office 9150 unit transitions the call back to
the IP network.
For detailed instructions on configuring the thresholds, refer to the Reach Line
Card Installation and Administration Guide (NTP 555-8421-210). For
guidelines on evaluating and adjusting the QoS on your IP network, see the
Remote Office Network Engineering Guidelines (NTP 555-8421-103).
Log reports and statistics
Configuration Manager provides a statistics log that identifies the number of
QoS transitions (see "Caller Information Statistics screen" on page 284).
See Chapter 7, "Administration" for a detailed description of log and statistic
reports.
Installation and Administration Guide
Remote Office 9150 description
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