To connect an LS2020 T3/E3 access card to an external device.
To connect two LS2020 switches via their T3, E3/PLCP, or E3/G.804 medium-speed access cards.
To connect an LS2020 T3, E3/PLCP, or E3/G.804 medium-speed access card to an external device.
The T3/E3 75-ohm coaxial cable is available from Cisco Systems in four different lengths. Use the appropriate number from the table below for ordering purposes.
Manufacturing No.LengthOrder No.
72-0998-01
3 feet
LS-CAB-T3-CX3=
72-0399-01
25 feet
LS-CAB-T3-CX25=
72-1000-01
50 feet
LS-CAB-T3-CX50=
72-1001-01
100 feet
LS-CAB-T3-CX100=
Figure 3-17 is a physical representation of 75-ohm T3/E3 coaxial cable.
Figure 3-18 shows the external connectors on both the multimode and single mode OC-3c access cards. The multimode OC-3c and single mode OC-3c cables are described in separate sections below.
Multimode interface connector type: Duplex SC
Connectors per multimode access card: 4 (2 per port; ports are numbered 0 and 1)
Single mode interface connector type: ST
Connectors per single mode access card: 4 (2 per port; ports are numbered 0 and 1)
Figure 3-18: Connectors on Multimode and Single Mode OC-3c Access Cards
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.
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