Nortel Networks NN43001-563 User Manual download pdf (Page 157)

IP Trunk 3.01 (and later) LAN installation and conﬁguration 157

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.

The TLAN network interface on the Media Card 32-port trunk card and the

ITG-Pentium 24-port trunk card operates on half-duplex or full-duplex and

can run at 10BaseT or 100BaseT.

Nortel Communication Server 1000

IP Trunk Fundamentals

NN43001-563 02.01 Standard

Release 5.5 21 December 2007

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Nortel Networks NN43001-563 User Manual Page 157