2-3
Cisco 12000 Series Router SIP and SPA Hardware Installation Guide
Release 12.0(32)SY1, OL-8831-01, Rev. G6, July 19, 2007
Chapter 2 Overview: Cisco 12000 Series Router Shared Port Adapters
Bandwidth Oversubscription
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Bandwidth Oversubscription
Oversubscribing the bandwidth limit recommendations of a router can result in decreased or degraded
performance. For this reason, it is important to determine the amount of bandwidth used by the SPAs on
the router and verify that the total bandwidth used by all SPAs does not exceed the recommended
bandwidth limit of the router.
Table 2-2
provides information about the bandwidth for each port (per-port bandwidth) on a SPA, as well
as the cumulative bandwidth (total bandwidth) for all ports available on the SPA.
Table 2-2
SPA Bandwidth Capacity
SPA
Per-Port Bandwidth
Number
of Ports
Total Bandwidth
2-Port Channelized T3 SPA
44.736 Mbps
2
89.47 Mbps
4-Port Channelized T3 SPA
44.736 Mbps
4
178.94 Mbps
2-Port Clear Channel T3/E3 SPA
44.736 Mbps (T3)
34.368 Mbps (E3)
2
89.47 Mbps (T3)
68.74 Mbps (E3)
4-Port Clear Channel T3/E3 SPA
44.736 Mbps (T3)
34.368 Mbps (E3)
4
178.94 Mbps (T3)
137.47 Mbps (E3)
8-Port Channelized T1/E1 SPA
1.544 Mbps (T1)
2.048 Mbps (E1)
8
12.35 Mbps (T1)
16.38 Mbps (E1)
1-Port 10-Gigabit Ethernet SPA
10 Gbps
1
10 Gbps
2-Port Gigabit Ethernet SPA
1 Gbps
2
2 Gbps
5-Port Gigabit Ethernet SPA
1 Gbps
5
5 Gbps
10-Port Gigabit Ethernet SPA
1 Gbps
10
10 Gbps
1-Port OC-48c/STM-16 POS SPA
2.488 Gbps
1
2.488 Gbps
1-Port OC-192c/STM-64 POS SPA
9.953 Gbps
1
9.953 Gbps
2-Port OC48-POS/RPR SPA
2.488 Gbps
2
4.976 Gbps
2-Port OC-3c/STM-1 and OC-12c/STM-4
POS SPA
155.52 Mbps or
622.08 Mbps
2
1.244 Gbps
4-Port OC-3c/STM-1 and OC-12c/STM-4
POS SPA
155.52 Mbps or
622.08 Mbps
4
2.488 Gbps
8-Port OC-3c/STM-1 and OC-12c/STM-4
POS SPA
155.52 Mbps or
622.08 Mbps
8
5 Gbps
1