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ATM Management Information Base Specifications
interfaces that use UTP, 100-ohm twisted pair cables and E1 interfaces that use UTP, 120-ohm twisted
pair cables (see
transmissions is 1000 feet (300 meters).
For RJ-48C T1 and E1 (120-ohm) connections in the U.S. and Canada, you can use UTP cables to meet
Note
FCC Part 15 Class A EMI requirements. For RJ-48C T1 and E1 (120-ohm) connections in Japan and
other countries, you can use STP cables to meet VCCI Class II EMI requirements.
Figure 1-16 CBR 120-Ohm RJ-48C Interface Cable and Connector
RJ-48c connector
ATM Management Information Base Specifications
The ATM UNI specification defines the required management information base (MIB) functionality for
ATM interfaces. MIB attributes are readable and writable across the Interim Local Management
Interface (ILMI) through use of the Simple Network Management Protocol (SNMP). The ILMI uses
SNMP, without UDP, and Internet Protocol (IP) addressing along with the ATM MIB.
The ATM CES port adapter supports RFC 1213, RFC 1406, RFC 1407, and SONET MIB RFC 1595
interface MIBs. Refer to the ATM UNI specification for additional details on the MIBs.
Fibre-Optic Transmission Specifications
The following sections describe the SONET specifications for fiber-optic transmissions, define the
power budget, and help you approximate the power margin for single-mode transmissions:
•
•
Maximum Transmission Distances for SONET
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, they arrive at the
destination at different times (a phenomenon called modal dispersion). The typical maximum distance
between stations, as defined by SONET, for single-mode transmissions is up to 9 miles (15 kilometers).
The ATM CES port adapter uses single-mode fiber, which is capable of higher bandwidth and greater
cable run distances than multimode fiber.
PA-A2 ATM CES Port Adapter Installation and Configuration
1-20
Figure
1-16). The typical maximum distance between stations for T1 and E1
8 7 6 5 4 3 2 1
Maximum Transmission Distances for SONET, page 1-20
Power Budget, page 1-21
Chapter 1
Overview: PA-A2 ATM CES Port Adapter
OL-3460-01
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