Multitech TalkAnytime TA410 User Manual page 68

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
Field Name
802.1p (continued)
Call Control
Priority
VoIP Media
Priority
Others (Priorities)
VLAN ID
Multi-Tech Systems, Inc.
Ethernet/IP Parameter Definitions (cont'd)
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.
Ethernet/IP Parameter Definitions (cont'd)
Values
Ethernet Parameters
4 – Controlled Load:
some 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.
7 - Network Control:
support network infrastructure.
HIGHEST PRIORITY
0-7, where 0 is
lowest priority
0-7, where 0 is
lowest priority
0-7, where 0 is
lowest priority
1 - 4094
TalkAnyTime User Guide
Description
Important business applications subject to
Traffic urgently needed to maintain and
Sets the priority for signaling packets.
Sets the priority for media packets.
Sets the priority for SMTP, DNS, DHCP, and other
packet types.
The 802.1Q IEEE standard allows virtual LANs to
be defined within a network. This field identifies
each virtual LAN by number.
Chapter 5: Technical Configuration
68