Alcatel-Lucent 9500 MXC - Page 81

9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. II-2-25
Simple Link With External Switching
While IDU ES provides comprehensive layer 2 switch functionality, it can only
support a maximum of four directly connected hosts, which for most office
applications is insufficient, bearing in mind each device on the LAN must be
directly connected to its own port on the switch (star connected).
The solution is provided by a 3rd party industry-standard multi-port layer 2
switch, as shown in Figure 2-10
Figure 2-10. IDU ES with External Switch: Single Channel
When used in this way, the LAN mode and QoS settings would normally be
configured within the external switch, and a single port connection used to the
IDU ES.
With just one channel in use (C1 or C2), the maximum Ethernet capacity
supported is 98 Mbps. For this throughput an optimum link solution is provided
by the IDU ES 100 Mbps option.
Higher throughputs are provided by IDU ES 150 (~150 Mbps) and IDU ES 200
(~200 Mbps), but to make use of such capacity both IDU ES channels must be
used, as shown in Figure 2-11. The IDU ES is configured for Mixed Mode to
support two independent LANs/VLANs on transport channels C1 and C2, and
each is separately ported to the external switch.
Figure 2-11. IDU ES Link with External Switch: Both Channels
Where IDU ES links are to be networked, they must be physically interconnected
at intermediate sites. Figure 2-12 shows a typical small network with
back-to-back IDU ES installations at site B.
• External layer 2 multi-port switches are used where more than four host devices
are locally connected on the LAN: sites A, B and C.
• Site D shows no external switch. For a small office where no more than four
host devices are connected, the IDU ES provides a complete solution.
• Trib circuits are trib-cabled as for a standard E1/DS1 link.
P1 P1
IDU ES
IDU ES
E1/DS1
trib options
E1/DS1
trib options
Switch
Switch
Nx LAN
10/100Base-T
ports
Nx LAN
10/100Base-T
ports
C1
C1
L2 L2
P1
P2
P1
P2
IDU ES
IDU ES
E1/DS1
trib options
E1/DS1
trib options
Switch Switch
Nx VLAN1
10/100Base-T
ports
Nx VLAN1
10/100Base-T
ports
Nx VLAN2
10/100Base-T
ports
Nx VLAN2
10/100Base-T
ports
C1 & C2
C1 & C2
L2 L2