NEC Univerge SV9100 User Manual

Issue 2.0
SV9100 Networking Manual 5-11
IP Precedence
IP precedence uses the first three bits of the ToS field to give eight possible
precedence values (0~7). Under normal circumstances, the higher the
number, the higher the priority. However, the administrator can assign these
precedence values with the lower values having a higher priority.
The following table shows the eight common values for IP precedence.
Working in conjunction with IP precedence, the next four bits in the ToS field
influence the delivery of data based on the following:
 delay
 throughput
 reliability
 cost
However these fields are usually not used. The following table shows the
eight bit ToS field and the associated IP precedence bits.
Table 5-3 IP Precedence Values
TOS Field
Precedence
Value
Higher Number Value Correlates
to Higher Priority
000 0
Routine or Best Effort
001 1
Priority
002 2
Immediate
003 3
Flash
004 4
Flash Override
005 5
Critical
006 6
Internetwork Control
007 7
Network Control
Table 5-4 ToS Field with IP Precedence Bits
IP Precedence IP Precedence
IP
Precedence
Delay
Throughp
ut
Reliabilit
y
Cost
Not
Used
1(on) here = value of 4 1(on) here = value of 2 1(on) here = value of 1

NEC Univerge SV9100 Specifications

General

VoIP Support	Yes
VoIP Protocols	SIP, H.323
Voicemail	Integrated voicemail
Networking	Yes, via IP
Unified Communications	Yes
Mobility	Supports mobile extensions and applications
Type	IP-PBX
Network Interfaces	Gigabit Ethernet
Power Supply	AC 100-240V, 50/60Hz
Operating Temperature	32°F to 104°F (0°C to 40°C)
Storage Temperature	-20°C to 60°C (-4°F to 140°F)
Weight	Varies depending on chassis and expansion cards