Extreme Networks Summit 200-24, Руководство по установке оборудования

Страница: 54 / 386

54 Extreme Networks Consolidated "i" and "e" Series Hardware Installation Guide
Site Preparation
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
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
Receivers
GBIC Type LX70
ZX (before
Rev 03)
ZX Rev 03 LX100
LX70 10 dB 10 dB 10 dB 11 dB
Transceivers ZX (before
Rev 03) 0 dB 0 dB 0 dB 8 dB
XM_041
ZX GBIC
ZX GBIC
Rev. 03
ZX GBIC
Rev. 03
ZX GBIC
Rev. 03
21.0 dB 19.5 dB
ZX GBIC ZX GBIC
LX70 LX70
18.0 dB
23.5 dB
ZX GBIC LX70
29.0 dB
23.0 dB
19.0 dB
21.5 dB
23.0 dB
20.0 dB
LX70 LX100
LX100
LX100
30.0 dB
ZX GBIC
ZX GBIC
Rev. 03
LX100 LX100
25.0 dB
24.5 dB
27.0 dB
24.0 dB
LX70
ZX GBIC
Rev. 03
22.0 dB