Cisco NM-1A-OC3MM-EP= Datasheet download pdf (Page 14)

Connecting Cisco ATM Network Modules to the Network

ATM OC-3 Network Modules

Connecting Cisco ATM Network Modules to the Network

Figure 19 Class 1 Laser Warning Label

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:

• SONET Distance Limitations

• Power Budget and Power Margin

• Link Loss

• Estimating the Power Margin

• Single-Mode Transmission

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 7 lists typical maximum distances for single-mode and multimode transmissions, as defined by

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.

ATM

1A-OC3MM

14862

ATM 0

AISOOFFERFRCLK

CLASS 1 LASER PRODUCT PRODUCT LASER DE CLASSE1

LASERPRODUCT DER KLASSE 1 PRODUCTO LASER CLASE 1

CLASS 1 LASER PRODUCT PRODUIT LASER DE CLASSE 1

LASERPRODUKT DER KLASSE 1 PRODUCTO LASER CLASE 1

Table 7 Typical SONET Maximum Fiber-Optic Transmission Distances

Transceiver Type Maximum Distance Between Stations

MM 1.5 miles (2 km)

SMI 9 miles (15 km)

SML 28 miles (40 km)

1 ... 13 14 15 16 17 18

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Cisco NM-1A-OC3MM-EP= Datasheet Page 14