Specifications

Summary of services
34 Administration for the Avaya G450 Media Gateway
WAN features
The G450 supports the following WAN features:
● Traffic shaping. The traffic shaping function estimates the parameters of the incoming
traffic and takes action if it measures traffic exceeding agreed parameters. The action
could be to drop the packets or mark them as being high drop priority.
● PPP over channeled and fractional E1/T1. The G450 has the ability to map several PPP
sessions to a single E1/T1 interface.
● PPP over Universal Serial Port
● PPPoE
● Unframed E1 for enabling full 2.048 Mbps bandwidth usage
● Point-to-Point Frame Relay encapsulation over channelized/fractional/unframed E1/T1
ports or over a Universal Serial Port interface
● Frame Relay LMI types supported: ANSI (Annex D), ITU-T:Q-933 (Annex A0), LMI-Rev1,
and No LMI
● Backup functionality supported between any type of Serial Layer 2 interface
● Dynamic Call Admission Control (CAC) for Fast Ethernet, Serial, and GRE tunnel
interfaces. Dynamic CAC provides enhanced control over WAN bandwidth. When
Dynamic CAC is enabled on an interface, the G450 informs the MGC of the actual
bandwidth of the interface and tells the MGC to block calls when the bandwidth is
exhausted.
● Quality of Service (QoS). The G450 uses Weighted Fair VoIP Queuing (WFVQ) as the
default queuing mode for WAN interfaces. WFVQ combines weighted fair queuing (WFQ)
for data streams and priority VoIP queuing to provide the real-time response time that is
required for VoIP. The G450 also supports the VoIP Queue and Priority Queue legacy
queuing methods.
● Weighted Random Early Detection (WRED). The G450 uses WRED on its ingress and
egress queues to improve the performance of the network when overloaded. The purpose
of WRED is to indicate to transmitting hosts to reduce their transmission speed when the
ingress G450 queues are congested.
● Policy. Each interface on the G450 can have four active policy lists:
- Ingress Access Control List
- Ingress QoS List
- Egress Access Control List
- Egress QoS List
Access control lists define which packets should be forwarded or denied access to the
network. QoS lists change the DSCP and 802.1p priority of routed packets according to
the packet characteristics.