Nortel Networks NN43001-563 - Manual (Page 158)

158 ITG engineering guidelines
• Remote support access is not required, and there is no firewall router
between the ELAN subnet and the TLAN subnet.
Multiple IP Trunk 3.01 (and later) nodes on the same ELAN and TLAN
segments
There are several configurations where it is acceptable to put multiple
IP Trunk 3.01 nodes on the same dedicated ELAN and TLAN segments
(separate subnets), or on a dedicated ELAN/TLAN segment (single subnet):
1. Several IP Trunk 3.01 (and later) nodes belonging to the same customer
in the same system can be configured to route calls with different codecs
depending on the digits dialed or the NCOS of the originating telephone,
or to limit the maximum number of IP Trunk 3.01 (and later) calls to a
particular destination node. The traffic engineering considerations on
the TLAN subnet should determine how many different IP Trunk 3.01
nodes can be configured on the same LAN segment.
2. Layer 2 (10 BaseT or 100 Base TX) switching equipment or ATM
infrastructure can support a Virtual LAN (VLAN) segment that is
distributed across a campus or larger corporate network. In this case,
some or all of the ITG destination nodes can be on the same subnet.
3. In test labs, training centers, and trade shows, it is common for
destination nodes to be located on the same LAN segment and subnet.
General LAN considerations
Although the TLAN subnet traffic capacity does not limit IP Trunk 3.01 (and
later) network engineering, the IP Trunk 3.01 (and later) network design
must take into consideration the limitations of the existing LAN and WAN
equipment.
Passive Ethernet hubs are not supported. Use Layer Two Ethernet switches
for both the ELAN and TLAN subnets. Ideally, managed switches should
be used.
WARNING
The ELAN and TLAN subnets must be connected to Layer 2
switches. Shared-media hubs are not supported, as they cause
unreliable system operation and unpredictable voice quality.
ELAN and TLAN network interface half- or full-duplex operation
The ELAN network interface on the Media Card 32-port trunk card and the
ITG-Pentium 24-port trunk card operates at half-duplex only and is limited to
10BaseT operation. This is due to filtering on the back planes.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.