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 optical transceiver modules used with the 2-Port OC-3 STM-1/OC-12 STM-4 POS SPA configured
for OC-12 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 or two
simplex LC-type cables, one for transmit (TX) and one for receive (RX).
Use single-mode (for short-, intermediate- or long-reach configurations) or multimode optical fiber cable to
connect your router to a network or to connect two OC-3-equipped or OC-12-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.
Figure 43: LC-Type Cable
4-Port OC-3 STM-1/OC-12 STM-4 POS SPA Overview
The 4-Port OC-3 STM-1/OC-12 STM-4 POS SPA is a single-height OC-12 SPA that can be installed into
one SIP subslot. The OC-12 SPA with small form-factor pluggable (SFP) optical transceiver modules provides
SONET and SDH network connectivity. Since any given channel can be configured as either OC-3 or OC-12,
so the per-port bandwidth can be either 155.52 Mbps or 622.08 Mbps respectively, depending on the type of
small form-factor pluggable (SFP) optical transceiver module installed.
When SFP modules are replaced, the SPA interface retains any previously-defined configurations. This
includes settings for IP address, clock source, loopback, CRC, and POS flags.
Note
The 4-Port OC-3 STM-1/OC-12 STM-4 POS SPA is a half rate SPA.
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 “SIP and
SPA Product Overview” chapter in this guide.
The following sections describe the 4-Port OC-3 STM-1/OC-12 STM-4 POS SPA:
Cisco ASR 9000 Series Aggregation Services Router SIP and SPA Hardware Installation Guide
53
Overview: Cisco ASR 9000 Series Router Shared Port Adapters
4-Port OC-3 STM-1/OC-12 STM-4 POS SPA Overview
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