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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
1-Port Clear Channel OC-12 ATM SPA Cables and Connectors
The 1-Port Clear Channel OC-12 ATM SPA uses a small form-factor pluggable (SFP) optical transceiver
module installed in each port for SONET and SDH single-mode and multimode optical fiber connection
(see Figure 2-53).
The 1-Port Clear Channel OC-12 ATM SPA supports the following types of optical transceiver modules:
Multimode (MM) SFP module—SFP-OC12-MM
Short-reach (SR) SFP module—SFP-OC12-SR
Intermediate-reach (IR) SFP module (15 km)—SFP-OC12-IR1
Long-reach (LR) SFP module (40 km)—SFP-OC12-LR1
Long-reach (LR) SFP module (80 km)—SFP-OC12-LR2
The SR, IR, and LR1 transceivers provide a full-duplex 622.08-Mbps, laser-based SONET/SDH-
compliant interface with an average wavelength of 1310 nm. The LR2 transceivers provide a full-duplex,
622.08-Mbps, laser-based SONET/SDH-compliant interface with an average wavelength of 1530 nm.
The multimode transceiver provides a full-duplex, 622.08-Mbps, LED-based SONET/SDH-compliant
interface with an average wavelength of 1325 nm.
Figure 2-53 SFP Optics Module
The 1-Port Clear Channel OC-12 ATM SPA provides the following optical fiber options:
• Multimode—622.08-Mbps, OC-12 optical fiber (SONET STS-12c or SDH STM-4)
Use a multimode optical fiber that has a core/cladding diameter of 62.5/125 microns.
• Single-mode—622.08-Mbps, OC-12 optical fiber (SONET STS-12c or SDH STM-4)
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 2-54) or two simplex LC-type cables, one for transmit (TX) and one for receive (RX).
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