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Catalyst 6500 Series Switch SIP, SSC, and SPA Hardware Installation Guide
OL-9041-04
Chapter 3 Catalyst 6500 Series Switch SPA Overview
2-Port and 4-Port OC-3c/STM-1 POS SPA Overview
2-Port and 4-Port OC-3c/STM-1 ATM SPA Interface Specifications
The physical layer interface for the 2-Port and 4-Port OC-3c/STM-1 ATM SPA is Optical Carrier-3
(OC-3), and the data link layer is designed to comply with ATM specifications. The 2-Port and 4-Port
OC-3c/STM-1 ATM SPA provides up to four 155-Mbps OC-3 network interfaces for all supported
platforms.
Each SPA port accepts an SFP module with a duplex LC-type receptacle that allows connection to
single-mode or multimode optical fiber.
2-Port and 4-Port OC-3c/STM-1 ATM SPA Cables and Connectors
The 2-Port and 4-Port OC-3c/STM-1 ATM SPAs 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 3-9) or two simplex LC-type cables, one for transmit (TX) and one for receive (RX).
Figure 3-9 Duplex Patch Cable with LC-Type Connectors
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 OC-3-equipped routers back-to-back.
Long-range SFP optics modules (for long-reach configurations) cannot be connected back-to-back
without using an attenuator between the two of them.
2-Port and 4-Port OC-3c/STM-1 POS SPA Overview
The 2-Port and 4-Port OC-3c/STM-1 POS SPAs are single-height SPAs that install into one SIP subslot.
The OC-3c/STM-1 POS SPAs with small form-factor pluggable (SFP) optical transceiver modules
provide SONET and SDH network connectivity with a per-port bandwidth of 155.52 Mbps. For more
information about SPA bandwidth, see the
“Bandwidth Oversubscription” section on page 3-3. For more
information about SPAs and their compatibility with SIPs and modular optics, see the “SIP, SSC, and
SPA Compatibility” section on page 1-3.
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