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Cisco 7600 Series Router SIP, SSC, and SPA Hardware Installation Guide
OL-5052-08
Chapter 3 Overview: Cisco 7600 Series Router Shared Port Adapters
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”
topic in this chapter. For more
information about SPAs and their compatibility with SIPs and modular optics, see the
“Carrier Card and
SPA Product Overview”
chapter in this guide.
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