Cisco 7000 Hardware Installation And Maintenance

2-78 Cisco 7000 Hardware Installation and Maintenance
Site Requirements
Table 2-10 lists the factors that contribute to link loss and the estimate of the link loss value
attributable to those factors.
Table 2-10 Estimating Link Loss
After calculating the power budget minus the data link loss, the result should be greater than zero.
Results less than zero may have insufficient power to operate the receiver.
For SONET versions of the AIP module, the signal must meet the minimum parameters listed
in Table 2-11.
Table 2-11 AIP SONET Minimum Signal Requirements
Multimode Power Budget Example with Sufficient Power for Transmission
The following is an example multimode power budget calculation based on the following variables:
Length of multimode link = 3 kilometers (km)
4 connectors
3 splices
Higher order loss (HOL)
Clock recovery module (CRM)
Estimate the power budget as follows:
PB = 11.5 dB – 3 km (1.0 dB/km) – 4 (0.5 dB) – 3 (0.5 dB) – 0.5 dB (HOL) – 1 dB (CRM)
PB = 11.5 dB – 3 dB – 2 dB – 1.5 dB – 0.5 dB – 1 dB
PB = 2.5 dB
The value of 2.5 dB indicates that this link would have sufficient power for transmission.
Link Loss Factor Estimate of Link Loss Value
Higher order mode losses 0.5 dB
Clock recovery module 1 dB
Modal and chromatic dispersion Dependent on fiber and wavelength used
Connector 0.5 dB
Splice 0.5 dB
Fiber attenuation 1 dB/km
Single-Mode Multimode
PT –18.5 –15
PR –30 –28
PB –11.5 –13

Cisco 7000 Specifications

General

Product Type	Switch
Model	7000
Category	Switch
Ports	Varies by configuration
Power Supply	Redundant power supplies supported
Management	SNMP, CLI