Long-Range Gbic System Budgets - Extreme Networks Summit 300-24 Hardware Installation Manual

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the same as the maximum transmit power. There is no minimum attenuation or minimum cable length
restriction.
The ZX mini-GBIC is compatible with and interoperates with long-range GBICs. For more information
about the budget requirements and minimum attenuation requirements of long range GBICs, see

"Long-Range GBIC System Budgets".

Long-Range GBIC System Budgets
Measure cable plant losses with a 1550 nm light source and verify this to be within budget. When
calculating the maximum distance attainable, using optical cable with a specified loss per kilometer (for
example, 0.25 db/km), Extreme Networks recommends that 3 dB of the total budget be reserved for
losses induced by cable splices, connectors, and operating margin. Figure 14 shows the total optical
system budget between long range GBICs.
NOTE
The fiber loss budget plus all other penalties must not exceed the total optical system budget.
Figure 14: Total optical system budgets for long range GBICs
19.5 dB
ZX GBIC
22.0 dB
LX70
23.0 dB
LX70
20.0 dB
18.0 dB
ZX GBIC
23.5 dB
19.0 dB
ZX GBIC
21.5 dB
The ZX mini-GBIC is equivalent to the ZX Rev 03 GBIC.
Table 10 lists the minimum attenuations that are required by each long range GBIC to prevent saturation
of the receiver.
Table 10: Minimum attenuation requirements
GBIC Type
LX70
Transceivers ZX (before
Rev 03)
54
ZX GBIC
ZX GBIC
Rev. 03
LX70 LX100
ZX GBIC
LX70
Rev. 03
LX70 ZX GBIC
ZX GBIC ZX GBIC
Rev. 03 Rev. 03
Receivers
ZX (before
LX70 Rev 03)
10 dB 10 dB
0 dB 0 dB
ZX GBIC
21.0 dB
30.0 dB
29.0 dB
23.0 dB
25.0 dB
24.5 dB
27.0 dB
24.0 dB
ZX Rev 03 LX100
10 dB 11 dB
0 dB 8 dB
Extreme Networks Consolidated "i" and "e" Series Hardware Installation Guide
Rev. 03
LX100
LX100
LX100
LX100
XM_041