Cisco CX-AIP-TM Installation And Configuration Manual page 8

AIP Installation Prerequisites
Hardware Requirements
To ensure correct operation of the E3, DS3, and TAXI AIPs, Hardware Revision 1.3 (shipped from
March 1995), the following minimum Cisco IOS release levels are required: 10.0(9), 10.2(5),
10.3(1), or later.
Caution
clip (CLIP-E3-EMI) on the receive port (RCVR).
SONET Distance Limitations
The SONET specification for fiber-optic transmission defines two types of fiber: single mode and
multimode. Modes can be thought of as bundles of light rays entering the fiber at a particular angle.
Single-mode fiber allows only one mode of light to propagate through the fiber, while multimode
fiber allows multiple modes of light to propagate through the fiber. Because multiple modes of light
propagating through the fiber travel different distances depending on the entry angles, causing them
to arrive at the destination at different times (a phenomenon called modal dispersion), single-mode
fiber is capable of higher bandwidth and greater cable run distances than multimode fiber.
The typical maximum distances for single-mode and multimode transmissions, as defined by
SONET, are listed in Table 1. If the distance between two connected stations is greater than these
maximum distances, significant signal loss can result, making transmission unreliable.
Table 1
Transceiver Type
Single-mode
Multimode
1. Table 1 gives typical results. You should use the power budget calculations to
determine the actual distances.
Evaluating the Power Budget
To design an efficient optical data link, you need to evaluate the power budget. The power budget is
the amount of light available to overcome attenuation in an optical link and to exceed the minimum
power that the receiver requires to operate within its specifications. Proper operation of an optical
data link depends on modulated light reaching the receiver with enough power to be correctly
demodulated.
Attenuation, caused by the passive media components (cables, cable splices, and connectors), is
common to both multimode and single-mode transmission.
The following variables reduce the power of the signal (light) transmitted to the receiver in
multimode transmission:
•
•
8 Asynchronous Transfer Mode Interface Processor (AIP) Installation and Configuration
To ensure compliance with EMI standards, the E3 PLIM connection requires an EMI filter
SONET Maximum Fiber-Optic Transmission Distances
Maximum Distance between Stations
Up to 9 miles (15 kilometers)
Up to 1.5 miles (3 kilometers)
Chromatic dispersion (spreading of the signal in time because of the different speeds of light
wavelengths)
Modal dispersion (spreading of the signal in time because of the different propagation modes in
the fiber)
1