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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
Packet data is transported with a user-configured encapsulation [such as Point-to-Point Protocol (PPP)]
and is mapped into the STS-3c/STM-1 frame.
The OC-3c/STM-1 POS SPA interface is compliant with RFC 1619, PPP over SONET/SDH, and RFC
1662, PPP in HDLC-like Framing. The OC-3c/STM-1 POS SPA also provides support for SNMP agent
v1 (RFC 1155-1157), and Management Information Base (MIB) II (RFC 1213).
OC-3c/STM-1 POS SPA SFP Optical Transceiver Modules and Cables
The POS SPA uses a small form-factor pluggable (SFP) optical transceiver module (see Figure 3-11)
installed in each port for SONET and SDH single-mode and multimode optical fiber connection.
Figure 3-11 SFP Optics Module
The SFP optical transceiver modules used with the POS SPAs 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
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 3-12) or two simplex LC-type cables, one for transmit (TX) and one for receive (RX).
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-3c/STM-1-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 two of them.
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