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Technical Configuration
The Ethernet/IP Parameters fields are described in the tables and text passages below. Note that both
DiffServ parameters (Call Control PHB and VoIP Media PHB) must be set to zero if you enable Packet
Prioritization (802.1p). Nonzero DiffServ values negate the prioritization scheme.
Field Name
Ethernet Parameters
Packet
Prioritization
(802.1p)
Frame Type
802.1p
Call Control
Priority
VoIP Media
Priority
Others
(Priorities)
VLAN ID
Ethernet/IP Parameter Definitions
Values
Description
Y/N
Select to activate prioritization under 802.1p protocol (described
below).
.
Type II, SNAP
Must be set to match network's frame type. Default is
Type II.
A draft standard of the IEEE about data traffic prioritization on Ethernet networks. The
802.1p draft is an extension of the 802.1D bridging standard. 802.1D determines how
prioritization will operate within a MAC-layer bridge for any kind of media. The
802.1Q draft for virtual local-area-networks (VLANs) addresses the issue of
prioritization for Ethernet networks in particular.
802.1p enacts this Quality-of-Service feature using 3 bits. This 3-bit code allows data
switches to reorder packets based on priority level. The descriptors for the 8 priority
levels are given below.
802.1p PRIORITY LEVELS
LOWEST PRIORITY
Bulk transfers and other activities permitted on the
1 – Background :
network, but should not affect the use of network by other users
and applications.
An unused (spare) value of the user priority.
2 – Spare :
0 – Best Effort (default): Normal priority for ordinary LAN traffic.
The best effort type of service that an information services
3 – Excellent Effort :
organization would deliver to its most important customers.
Important business applications subject to some
4 – Controlled Load :
form of "Admission Control", such as preplanning of Network
requirement, characterized by bandwidth reservation per flow.
Traffic characterized by
5 – Video :
delay < 100 ms.
Traffic characterized by
6 – Voice :
delay < 10 ms.
Traffic urgently needed to maintain and support
7 - Network Control :
network infrastructure.
HIGHEST PRIORITY
0-7, where 0 is
Sets the priority for signaling packets.
lowest priority
0-7, where 0 is
Sets the priority for media packets.
lowest priority
0-7, where 0 is
Sets the priority for SMTP, DNS, DHCP, and other packet types.
lowest priority
1 - 4094
The 802.1Q IEEE standard allows virtual LANs to be defined
within a network. This field identifies each virtual LAN by
number.
76
TalkAnytime User Guide
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