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Table Of Contents
Dual Optical L4.2 Module, L4.2-2-LC
18.2 External L-4.2-LC Interface
18.2.4 Example of Cable Planning
Dual Optical L4.2 Module, L4.2-2-LC
18.1 Module Description
This is a dual port STM4 module for long haul transmission at 1550nm optical wavelength. The main functions of the module are O/E- E/O conversion and SDH multi-/demultiplexing with VC-12, VC3 and VC-4 granularity. See 5.1.1 Multiplexing Structure and Mapping modes, page 5-1.
18.1.1 Power Consumption
The module power consumption is 13W.
18.2 External L-4.2-LC Interface
The 2xL-4.2-LC line interface bitrate is bi-directional with a transmit (Tx) and a receive (Rx) direction. Tx and Rx directions are transmitted on separate fibres. The optical interfaces are compliant to ITU-T Rec. G.957 L-4.2 Long Haul specification for transmission on Single Mode (SM) fibre.
18.2.1 Connector Type
The physical connector is a LC connector. See Figure 18-1.
Figure 18-1 STM-4 L4.2-2-LC
Module
18.2.2 Optical Budget
The Optical Budget - L4.2-2-LC Interface is described in Table 18-1.For definitions of optical parameters, see ITU-T Rec. G.957. Reference point S means transmit interface while R is the receive interface.
Table 18-1 Optical Budget - L4.2-2-LC Interface
18.2.3 Compliance
L4.2-2-LC Interface compliance is described in Table 18-2.
Table 18-2 Compliance - L4.2-2-LC Interface
18.2.4 Example of Cable Planning
Example of typical cable parameters and typical link spans are found in Table 18-3 and Table 18-4.
Table 18-3 Typical Cable Parameters
Table 18-4 Typical Link Spans for 2xL4.2-2-LC
18.2.4.1 Optical Rx Power Monitoring
The optical input power of the Rx interface is monitored and can be read from the Cisco EdgeCraft terminal.
Posted: Fri Sep 14 08:54:38 PDT 2007
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