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Circuit Pack Descriptions
Issue 1 December 1997 7-61
21G/21G-U OLIU Hardware Settings 7
The location of the 21G/21G-U OLIU circuit pack optical power output level switch
is shown in Figure 7-25. This switch allows the 21G/21G-U OLIU to be looped
back without an external optical attenuator cable. The optical power output level
switch in the LOW POWER position attenuates the transmit optical power by 5 dB.
Figure 7-25. 21G/21G-U OLIU Output Level Switch
NOTE: The 21G2-U OLIU does not have a High/Low transmitter power switch
due to improved overload sensitivity of the receiver used on the 21G2-U. Refer to
Table 10-5 for OLIU Link Budget information.
Connector
Edge
I or III
II
S1
Component Side
POWER
LOW
POWER
HIGH
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