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Cisco 7600 Series Router SIP, SSC, and SPA Hardware Installation Guide
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Chapter 3 Overview: Cisco 7600 Series Router Shared Port Adapters
1-Port OC-12c/STM-4 POS SPA Overview
Figure 3-15 SFP Optics Module
The SFP optical transceiver modules used with the POS SPAs provide 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 3-16) or two simplex LC-type cables, one for transmit (TX) and one for receive (RX).
Use single-mode (for intermediate- or long-reach configurations) or multimode optical fiber cable to
connect your router to a network or to connect two 1-Port OC-12c/STM-4 POS SPA-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.
Figure 3-16 LC-Type Cable
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