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Cisco 7600 Series Router SIP, SSC, and SPA Hardware Installation Guide
OL-5052-14
Chapter 3 Overview: Cisco 7600 Series Router Shared Port Adapters
1-Port Clear Channel OC-3, 3-Port Clear Channel OC-3, and 1-Port Clear Channel OC-12 ATM SPA Version 2 Overview
1-Port Clear Channel OC-3, 3-Port Clear Channel OC-3, and 1-Port Clear Channel
OC-12 ATM SPA Version 2 Interface Specifications
The physical layer and data link layer interfaces for the SPA-1xOC3-ATM-V2, SPA-3xOC3-ATM-V2,
and SPA-1xOC12-ATM-V2 is Optical Carrier-3 (OC-3), are designed to comply with ATM
specifications. The SPA-1xOC3-ATM-V2 and SPA-3xOC3-ATM-V2 provides up to one and three
155Mbps OC-3 network interfaces, respectively, for all supported platforms. The
SPA-1xOC12-ATM-V2 provides up to one 622Mbps 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 a
single-mode or multimode optical fiber.
1-Port Clear Channel OC-3, 3-Port Clear Channel OC-3, and 1-Port Clear Channel
OC-12 ATM SPA Version 2 Cables and Connectors
The 1-Port and 3-Port Clear Channel OC-3 ATM SPAs use a SFP optical transceiver module installed in
each port for SONET and SDH single-mode and multimode optical fiber connection (see
Figure 3-14
).
Figure 3-14
SFP Optics Module
These are the optical fiber options:
•
Multimode—155Mbps, 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—155Mbps, 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.)
The SFP module use either a duplex LC-type cable (see
Figure 3-15
) or two simplex LC-type cables, one
for transmit (TX) and another to 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 OC-3-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 modules.
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