Gbe Large Module (Supported On Secure Router 4134 Only) - Nortel Secure Router 4134 Installation Manual

GbE Large Module (supported on Secure Router 4134 only)

The 44-port 10/100/1000 Large Module provides 44 Ethernet ports that
each support 10/100/1000 Mbps operation over unshielded twisted pair
(UTP) wiring, as well as two SFP optical ports. Up to 44 ports can be in
use at one time.
The 44-port GbE Large Module provides both Layer 2 switching and Layer
3 routing functionality.
The following figure shows the 44-port GbE Large Module.
Figure 23
44-port GbE Large Module
This module is oversubscribed and provides a 4:1 blocking ratio. The total
available bandwidth at all of the ports (44 Gbps) is four times the available
routing bandwidth.
There are three groups on the module: one group has 12 ports, and two
groups have 16 ports each. For Layer 2 switching within each group,
packets can be switched at full bandwidth. However, for Layer 2 switching
between groups and for all packets that are routed (Layer 3), all external
ports must share a limited number of links on the module. There are
three links available within the group of 12 ports, and there are four links
available within each group of 16 ports. There is, therefore, a 12:3 (4:1) or
16:4 (4:1) contention for the internal links.
Interface modules for the Secure Router 2330/4134 43
CAUTION
If you do not install a module in a slot, keep the metal cover
plate in place over the slot. Removing the cover plate impedes
airflow and proper cooling of the unit.
Nortel Secure Router 2330/4134
Installation — Hardware Components
NN47263-301 03.01 7 September 2009
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