Sonet Distance Limitations; Fiber Cables And Connectors - Cisco 10720 - Internet Router Installation And Configuration Manual

Chapter 3 Installing the Cisco 10720 Internet Router
Figure 3-11

SONET Distance Limitations

The maximum distance for single-mode installations is determined by the amount of light loss in the
fiber path. Good quality single-mode short-reach optical cable with very few splices can carry an uplink
card signal 2 km. A single-mode, intermediate-reach optical cable signal can carry an uplink card signal
up to 15 km.
If your environment requires the signal to travel close to the typical maximum distance, use an Optical
Time Domain Reflectometer (OTDR) to measure the power loss.
Splicing can degrade cable performance.
Caution
Single-mode fiber-optic cables are available from a variety of vendors. These cables are not available
Note
from Cisco Systems.

Fiber Cables and Connectors

For SONET/SDH single-mode fiber-optic connections, use two simplex optical cables (see
or one duplex optical cable (see
Warning Class 1 laser product. Statement 1008
Class 1 LED product. Statement 1027
Warning
Because invisible radiation may be emitted from the aperture of the port when no fiber cable is
Warning
connected, avoid exposure to radiation and do not stare into open apertures. Statement 125
78-13062-10
Attaching the Grounding Lug to the Router Chassis
RE SE T
CO NS
OL E AU AC OK
X
DC OK
OTF
AC OK
DC OK
OTF
DON NOT
REM OVE
OR INSE
RT CAB
WITH THE LES
POW ER
ON
INP UT 100
-200 - 50/6
0Hz 2-5A
Figure 3-13).
Cisco 10720 Internet Router Installation and Configuration Guide

SONET Distance Limitations

Figure 3-12)
3-11