Nortel Secure Router 4134 Installation — Hardware Components page 50

50 Nortel Secure Router 4134 hardware components fundamentals
Figure 22
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.
Table 28
Cable and connectors
Port
Connector
10Base-T (full- RJ45
or half-duplex),
100Base-TX
(full duplex),
1000Base-T (full
duplex)
Copyright © 2007, 2008 Nortel Networks
.
Recommended
cable type
EIA Category
3, 4, or 5 UTP
for 10 Mb/s
operation.
EIA Category
5 UTP or STP
required for
100/1000 Mb/s
operation.
Nortel Secure Router 4134
Installation — Hardware Components
NN47263-301 02.01 Standard
18 February 2008
Minimum Maximum
cable length cable length
None 328 ft (100 m)