Serial Interface Overview - Avaya G350 Administration

Configuring a WAN

Serial interface overview

•
Quality of Service (QoS) — the G350 supports the ability to separate traffic into 4 strict priority
queues per egress serial interface. The queue assignment is performed using Policy. For more
information, see
•
Guaranteed delay for VoIP traffic — the G350 supports VoIP Queue mode in which traffic labeled
as voice traffic receives preference over all other traffic. The G350 default VoIP queuing mode is
optimized for the G.729 CODEC. For more information, see
page 63.
•
Weighted Random Early Detection (WRED) — the G350 uses WRED on its ingress and egress
queues in order 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 G350
ingress queues are congested. For more information, see
•
Weighted Fair Queuing (WFQ) — the G350 supports WFQ mode, which provides improved
bandwidth allocation among the different streams of data traffic and gives preference to
interactive traffic without causing any degradation to voice service. For more information, see
Configuring Weighted Fair Queuing (WFQ)
•
Policy — each interface on the G350 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. For more information, see
•
RTP Header Compression — use of RTP compression can save up to 60% of the interface's
bandwidth. RTP compression also enhances the efficiency of voice transmission over the network
by compressing the headers of Real Time Protocol (RTP) packets, thereby minimizing the
overhead and delays involved in RTP implementation. For more information, see
RTP header compression
Serial interface overview
A serial interface is a virtual interface that is created over a portion of an E1/T1 or USP port on a WAN
media module. Serial interfaces support PPP and frame relay encapsulation protocols.
Figure 1, Layer 1 T1 Port,
data from each Channel Group is encapsulated using PPP protocol, and is distributed over the multiple IP
interfaces defined for each Channel Group.
72
Configuring QoS parameters
Configuring policy
on page 62.
on page 73 illustrates a Layer 1 T1 port with two Channel Groups defined. All
Administration of the Avaya G350 Media Gateway
on page 63.
Configuring QoS parameters
Configuring QoS parameters
on page 65.
on page 159.
on
on page 63.
Configuring
June 2004