General Ip Configuration; Tos Settings (Layer 3 Qos) - NEC Univerge SV9100 Manual

5-10
The GPZ-IPLE needs only one IP Address.
When assigning the IP address to the IPLE card, the address must be
in the same network (subnet). If the CPU is also connected to the
network, it requires a separate IP address in a different network
IMPORTANT
(subnet).
When you have an IPLE card attached to the CPU, the CPU NIC is
no longer required. All connections that previously terminated to the
CPU NIC card can now be terminated to the IPLE NIC.
For example, PC Pro, Web Pro, ACD, etc. terminate to the IPLE NIC
card, when installed. Both the IPLE and CPU NIC share the same
gateway assignment. The default gateway command in 10-12-03 is
used by both NICs, allowing only one device, IPLE or CPU, to route
outside of its own network.
1.5.1

General IP Configuration

The voice quality of VoIP depends on variables such as available
bandwidth, network latency, and quality of service initiatives (QOS), all of
which are controlled by the network and Internet service providers.
Because these variables are not in NEC control, it cannot guarantee the
performance of the users IP based voice solution. Therefore, NEC
recommends connecting the VoIP equipment through a local area network
using private IP addresses.
For a network to be suitable for VoIP it must pass specific requirements. To
make sure that the site meets these requirements an IP ready check and a
site survey must be completed at each site before VoIP implementation.
One way delay must not exceed 100 ms

Round Trip delay must not exceed 200 ms

Packet loss must not exceed 1%

Data switches must be manageable

Routers must provide QOS

Adequate bandwidth for estimated VoIP traffic (refer to

Bandwidth)
Depending on how QOS policies are built in the network, assignments
might be needed in the CPU.
1.5.2

ToS Settings (Layer 3 QoS)

The marking of packets at layer 3 is done by marking the ToS byte in the IP
header of the voice packet. The SV9100 supports two methods for marking
the ToS byte.
IP precedence

DSCP (Diffserv)

Issue 2.0
1.5.3
SV9100 IP K-CCIS