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Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Hardware Installation Guide
OL-14126-12
Chapter 3 Overview: Cisco ASR 1000 Series Aggregation Services Routers SPAs
1-Port OC-12c/STM-4 POS SPA Overview
• RFC 1213, Management Information Base (MIB) for Network Management of TCP/IP-Based
Internets:MIB II
1-Port OC-12c/STM-4 POS SPA SFP Optical Transceiver Modules and Cables
The 1-Port OC-12c/STM-4 POS SPA uses a small form-factor pluggable (SFP) optical transceiver
module installed in the port for SONET and SDH single-mode and multimode optical fiber connection
(see Figure 3-30).
Cisco qualifies the optics that are approved for use with its SPAs. The 1-Port OC-12c/STM-4 POS SPA
supports the following types of optical transceiver modules:
• Multimode (MM) SFP module—SFP-OC12-MM
• Short-reach (SR) SFP module—SFP-OC12-SR
• Intermediate-reach (IR) SFP module (15 km)—SFP-OC12-IR1
• Long-reach (LR) SFP module (40 km)—SFP-OC12-LR1
• Long-reach (LR) SFP module (80 km)—SFP-OC12-LR2
Figure 3-30 SFP Optics Module
The SFP optical transceiver modules used with the 1-Port OC-12c/STM-4 POS SPA provide the
following optical fiber options:
• Multimode—622.08-Mbps, OC-12 optical fiber (SONET STS-12c or SDH STM-4)
Use a multimode optical fiber that has a core/cladding diameter of 62.5/125 microns.
• Single-mode—622.08-Mbps, OC-12 optical fiber (SONET STS-12c or SDH STM-4)
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 3-31) 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 1-Port OC-12c/STM-4 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 the two of them.
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