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Cisco XR 12000 Series Router SIP and SPA Hardware Installation Guide
OL-17438-04
Chapter 2 Overview: Cisco XR 12000 Series Router Shared Port Adapters
1-Port Clear Channel OC-12 ATM SPA Overview
• Single-mode—155-Mbps, OC-3 optical fiber (SONET STS-3c or SDH STM-1)
Use a single-mode optical fiber that has a modal-field diameter of 8.7 ± 0.5 microns. (Nominal
diameter is approximately 10/125 microns.)
For single-mode and multimode optical fiber connections, you can use either a duplex LC-type cable (see
Figure 2-51) or two simplex LC-type cables, one for transmit (TX) and one for receive (RX).
Use a single-mode (for intermediate-reach or long-reach configurations) or multimode optical fiber
cable to connect your router to a network or to connect two OC-3-equipped routers back-to-back.
Long-range SFP optical transceiver modules (for long-reach configurations) cannot be connected
back-to-back without using an attenuator between them.
Figure 2-51 Duplex Patch Cable with LC-Type Connectors
1-Port Clear Channel OC-12 ATM SPA Overview
The 1-Port Clear Channel OC-12 ATM SPA is a single-height ATM SPA that can be installed into one
SIP subslot. The OC-12 ATM SPA with small form-factor pluggable (SFP) optical transceiver modules
provides SONET and SDH network connectivity with a per-port bandwidth of 622.08 Mbps. For more
information about SPA bandwidth, see the “Bandwidth Oversubscription” section in this chapter.
The following sections describe the 1-Port Clear Channel OC-12 ATM SPA:
• 1-Port Clear Channel OC-12 ATM SPA LEDs, page 2-70
• 1-Port Clear Channel OC-12 ATM SPA Interface Specifications, page 2-71
• 1-Port Clear Channel OC-12 ATM SPA Cables and Connectors, page 2-72
1-Port Clear Channel OC-12 ATM SPA LEDs
The 1-Port Clear Channel OC-12 ATM SPA has three types of LEDs. There are two LEDs for the port
on the SPA, and one STATUS LED, as shown in Figure 2-52.
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