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Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Hardware Installation Guide
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Chapter 3 Overview: Cisco ASR 1000 Series Aggregation Services Routers SPAs
2-Port, 4-Port, and 8-Port OC-12c/STM-4 POS SPA Overview
2-Port, 4-Port, and 8-Port OC-12c/STM-4 Multirate POS SPA Optical Transceiver
Modules, Connectors, and Cables
The 2-Port, 4-Port, and 8-Port OC-12c/STM-4 Multirate POS SPA uses a small form-factor pluggable
(SFP) optical transceiver module installed in each port for SONET multimode optical fiber connection
(see Figure 3-33).
The 2-Port, 4-Port, and 8-Port OC-12c/STM-4 Multirate POS 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
Figure 3-33 SFP Optics Module
The SFP optical transceiver modules used with the 2-Port, 4-Port, and 8-Port OC-12c/STM-4 Multirate
POS SPA provide the following optical fiber options:
• Multimode—622.08-Mbps, OC-12c/STM-4 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-12c/STM-4 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 3-34) or two simplex LC-type cables, one for transmit (TX) and one for receive (RX).
Use single-mode (for short-, intermediate- or long-reach configurations) or multimode optical fiber
cable to connect your router to a network or to connect two OC-3-equipped or OC-12-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 the two of them.
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