3Com CoreBuilder 9000 Installation Manual page 6

6
1000BASE-LH70 GBIC Transceivers
Table 3 shows the transmission range and other data for this
connection.
Table 3 1000BASE-LH70 GBIC Single-Mode Transmission Range
Fiber Type
Single-mode
Table 4 shows the optical parameters of the
Transceiver.
CAUTION: If using cable lengths shorter than 20 km, you must ensure
that a single-mode fiber attenuator is used to avoid signal saturation.
Minimum
Diameter Connector
(microns) End Polish Transmission Range
9µm core PC 20 – 70 km (13 – 43 miles)
1000BASE-LH70 GBIC