Nortel 4134 安装指导
38
Nortel Secure Router 4134 hardware components fundamentals
Figure 17
44-port GbE Large Module
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.
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.
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 22
Cable and connectors
Cable and connectors
Port
Connector
Recommended
cable type
cable type
Minimum
cable length
cable length
Maximum
cable length
cable length
10Base-T (full-
or half-duplex),
100Base-TX
or half-duplex),
100Base-TX
RJ-45
EIA Category 3,
4, or 5 UTP for 10
Mb/s operation.
4, or 5 UTP for 10
Mb/s operation.
None
328 ft (100 m)
Nortel Secure Router 4134
Installation — Hardware Components
NN47263-301
01.02
Standard
10.0
7 August 2007
Copyright © 2007, Nortel Networks
.