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Cisco CRS-1 Carrier Routing System SIP and SPA Hardware Installation Guide
OL-17439-01
Chapter 3 Overview: Cisco CRS-1 Shared Port Adapters
4-Port OC-3c/STM-1 POS SPA Overview
Figure 3-9 SFP Optics Module
The SFP optical transceiver modules used with the 4-Port OC-3c/STM-1 POS SPA provide the following
optical fiber options:
• Multimode—155-Mbps, OC-3c/STM-1 optical fiber (SONET STS-3c or SDH STM-1)
Use a multimode optical fiber that has a core/cladding diameter of 62.5/125 microns.
• Single-mode—155-Mbps, OC-3c/STM-1 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
d
iameter is approximately 10/125 microns.)
For single-mode and multimode optical fiber connections, you c
an use either a duplex LC-type cable (see
Figure 3-10) or t
wo simplex LC-type cables, one for transmit (TX) and one for receive (RX).
Use single-mode (for intermediate-reach or long-reach configurations) or multimode optical fiber cable
t
o connect your router to a network or to connect two 4-Port OC-3c/STM-1 POS SPA-equipped routers
back-to-back.
Long-range SFP optical transceiver modules (for long-reach conf
igurations) cannot be connected
back-to-back without using an attenuator between them.
Figure 3-10 LC-Type Cable
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