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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
1-Port Clear Channel OC-12 ATM SPA Overview
Figure 3-2 SFP Optics Module
The SFP optical transceiver modules used with the 1-Port and 3-Port Clear Channel OC-3 ATM SPA
provide the following optical fiber options:
• Multimode—155-Mbps, OC-3 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-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 3-3) 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 1-Port and 3-Port Clear Channel OC-3 ATM
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 them.
Figure 3-3 Duplex Patch Cable with LC-Type Cables
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.
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