2-47
Cisco XR 12000 Series Router SIP and SPA Hardware Installation Guide
OL-17438-04
Chapter 2 Overview: Cisco XR 12000 Series Router Shared Port Adapters
4-Port OC-3/STM-1 POS SPA Overview
Figure 2-32
SFP Optics Module
The SFP optical transceiver modules used with the 2-Port and 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
) 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 2-Port and 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 2-33
LC-Type Cable
127158
/ /
/ /
/ /
TX
RX
84929
