Cisco CISCO2650 - 2650 Router Hardware Installation Manual page 190

ATM OC-3 Network Modules
Figure 11-19 Class 1 Laser Warning Label
ATM
1A-OC3MM
Warning Because invisible laser radiation may be emitted from the aperture of the port when no fiber cable
is connected, avoid exposure to laser radiation and do not stare into open apertures. Statement 240
Fiber-Optic Transmission Specifications
This section describes Synchronous Optical Network (SONET) specifications for fiber-optic
transmissions, defines the power budget, and helps you estimate your power margin for multimode and
single-mode transmissions. This section contains the following information:
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SONET Distance Limitations
The SONET specification for fiber-optic transmission defines two types of fiber, single-mode and
multimode. Single-mode fiber allows only one bundle of light rays to propagate through the fiber,
whereas multimode fiber allows multiple bundles entering at different angles. Because different bundles
(referred to as modes) travel different distances, depending on the entry angle, they arrive at the
destination at different times (modal dispersion). Single-mode fiber is capable of higher bandwidth and
greater cable run distances than multimode fiber.
Table 11-8
SONET. Use the calculations described in this section to determine the actual maximum for your
network. If the distance between two connected stations exceeds this limit, transmission can become
unreliable.
Cisco Network Modules Hardware Installation Guide
11-14
CLASS 1 LASER PRODUCT
LASERPRODUKT DER KLASSE 1
SONET Distance Limitations
Power Budget and Power Margin
Link Loss
Estimating the Power Margin
Single-Mode Transmission
lists typical maximum distances for single-mode and multimode transmissions, as defined by
Chapter 11
PRODUIT LASER DE CLASSE 1
PRODUCTO LASER CLASE 1
CLASS 1 LASER PRODUCT PRODUCT LASER DE CLASSE1
LASERPRODUCT DER KLASSE 1 PRODUCTO LASER CLASE 1
ATM 0
RCLK FERF OOF AIS
Connecting ATM Network Modules
EN
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