Chapter 17, Single Optical L16.2 Module, L16.2-1-LC

Single Optical L16.2 Module, L16.2-1-LC

17.1 Module Description

This is an STM16 long haul module for 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 the "5.1.1 Multiplexing Structure and Mapping Modes" section on page 5-1.

17.1.1 Power Consumption

18W .

17.2 External L-16.2-LC Interface

The 1xL-16.2-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-16.2 Long Haul specification for transmission on Single Mode (SM) fibre.

17.2.1 Connector Type

The physical connector is a LC connector.

Figure 17-1 STM-16 L16.2-1-LC Module

17.2.2 Optical Budget

For definitions of optical parameters, see ITU-T Rec. G.957. Reference point S means transmit interface while R is the receive interface.

Table 17-1 Optical Budget - L16.2-1-LC Interface
Parameter	Value
Types of fibre: ITU-T Rec. G.652	10/125	痠
Modulation rate on optical line	2 488 320	kbit/s
Wavelength range	1500 - 1580	nm
Transmitter at reference point S
Source type	SLM
Spectral characteristics (max. -20dB width)	1	nm
Mean launched power (max.)	+3	dBm
Mean launched power (min.)	-2	dBm
Min. extinction ratio	8.2	dB
Optical path between S and R
Attenuation range	10 - 24	dB
Max. tolerable dispersion	1600	ps/nm
Min. optical return loss	24	dB
Max. discrete reflectance between S and R	-27	dB
Receiver at reference point R
Min. sensitivity (BER < 1 in 1010)	-28	dBm
Min. overload	-9	dBm
Max. optical path penalty	2	dB
Max. reflectance at R	-27	dB

17.2.3 Compliance

Table 17-2 Compliance - L16.2-1-LC Interface
Standard	Comment
ITU-T G.652	Single Mode Fibre specification 10/125
ITU-T G.707	Optical line signal
ITU-T G.813	Optical output jitter
ITU-T G.825	Optical input jitter
ITU-T G.957	Optical spectrum, Optical output power, Optical eye diagram, Optical extinction ratio.

17.2.4 Example of Cable Planning

Table 17-3 Typical Cable Parameters
Cable Loss, according to ITU-T Rec. G.957	Single Mode fibre Acc. to ITU-T G.652
Fibre Cable Attenuation Cable Margin (Mc) Loss in Optical Distribution Frame	0.3 dB/km Incl. in fibre cable attenuation Incl. in fibre cable attenuation


Cable Dispersion:
Maximum Chromatic Dispersion Coefficient	20 ps/nm*km

Table 17-4 Typical Link Spans for 1xL-16.2-LC
Loss Limited Span	Dispersion Limited Span	Overall Link Span
80 km	80 km	80 km

17.2.5 Optical Rx Power Monitoring

The optical input power of the Rx interface is monitored and can be read from the CiscoEdgeCraft terminal.

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