Cisco各类线缆

来源：vlan9收集作者：出处：巧巧读书 2005-08-22 进入讨论组

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Multimode OC-3c Cable

Where used: To connect a multimode OC-3c access card on an LS2020 switch to another OC-3c device.

Cisco Systems does not provide this cable; it is widely available from other vendors.

The LS2020 OC-3c interfaces operate at a wavelength of 1300 nanometers. Multimode cables should conform to the following specifications:

Standard: ISO/IEC 9314-3

Maximum path length (all cables in a connection, end to end): 2 km

Cabling: 62.5 micron core with an optical loss of 0-9 dB, or 50 micron core with an optical loss of 7 dB.

Note A single fiber link should not mix 62.5 and 50 micron cable.

Note Protective covers are provided for all OC-3c access cards and cable connectors. To shield connectors from dust and damage, keep covers on any connectors that are not being used.

Figure 3-19 shows a multimode OC-3c cable with simplex SC connectors.

Figure 3-19: Multimode OC-3c Cable with Simplex SC Connectors

Note Multimode OC-3c cables are available with both simplex SC connectors (as shown in Figure 3-19) and duplex SC connectors; both connector types are compatible with LS2020 multimode access cards. However, the use of duplex SC connectors is preferred because they are keyed in a way that prevents incorrect connections.

Single Mode OC-3c Cable

Where used: To connect a single mode OC-3c access card on an LS2020 switch to another OC-3c device. Cisco Systems does not provide this cable; it is widely available from other sources.

The LS2020 OC-3c interfaces operate at a wavelength of 1300 nanometers. Single mode cables should conform to the following specifications:

Standard: EIA class IVa

Cabling: 8.3 micron core with an optical loss of 0-12 dB and a maximum cable attenuation of 500 MHz/km at 1300 nanometers.

Note Protective covers are provided for all OC-3c access cards and cable connectors. To shield connectors from dust and damage, keep covers on any connectors that are not being used.

Connector Type: ST

Figure 3-20 shows a single mode OC-3c cable with ST connectors.

Figure 3-20: Single Mode OC-3c Data Cable with ST Connectors

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