Specifications

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Cisco XR 12000 Series Router SIP and SPA Software Configuration Guide, Release 3.2
Release 3.2, OL-6396-01, Rev.A1 January 9, 2006
Chapter 1 SIP and SPA Product Overview
Introduction to SIPs and SPAs
Shared Port Adapters
The following list describes some of the general characteristics of a SPA:
• A SPA is a modular type of port adapter that inserts into a subslot of a compatible SIP carrier card
to provide network connectivity and increased interface port density. A SIP can hold one or more
SPAs, depending on the SIP type.
• SPAs are available in the following sizes, as shown in Figure 1-1 and Figure 1-2:
– Single-width, single-height SPA—Inserts into a single SIP subslot.
– Single-width, double-height SPA—Inserts into two single, vertically aligned SIP subslots.
– Double-width, single-height SPA—Inserts into a two single, horizontally aligned SIP subslots.
– Double-width, double-height SPA—Inserts into all four SIP subslots, or the entire SPA
enclosure.
Figure 1-1 Single-height and Double-height SPA Sizes
Figure 1-2 Horizontal and Vertical Chassis Slot Orientation for SPAs
Single-height SPA
Double-height SPA
Front of SIP
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SPA 0 SPA 1
SPA 2 SPA 3
Front of SIP, horizontal chassis slots
SPA 0 SPA 1 SPA 2 SPA 3
Vertical slot orientation
SPA 0 SPA 1
Double-height SPA
SPA 3
SPA 1
Double-height SPA
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SPA 0
SPA 2