Figure 29: SFP Optics Module
The SFP optical transceiver modules used with the 4-Port OC-3/STM-1 POS SPA 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 the
below figure) or two simplex LC-type cables, one for transmit (TX) and one for receive (RX).
Use 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 4-Port OC-3/STM-1 POS 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 30: LC-Type Cable
OC-3 Module Connections
The following table shows the OC-3 specifications of the optics on the 4-Port OC-3/STM-1 POS SPA.
Table 27: OC-3 Specifications
DescriptionSpecification
OC-3 MM: 1270 nm to 1380 nmOC-3 SR: 1260 nm to 1360 nmOC-3 IR-1:
1261 nm to 1360 nmOC-3 LR-1: 1263 nm to1360 nmOC-3 LR-2: 1480
nm to 1580 nm
Wavelength
Cisco ASR 9000 Series Aggregation Services Router SIP and SPA Hardware Installation Guide
40
Overview: Cisco ASR 9000 Series Router Shared Port Adapters
OC-3 Module Connections
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