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Connecting the Control Unit to the Network Interface
Table 4-27. TB1 Pin Assignments
Pin No.
Designation Signal
1
T1
Transmit
2
R1
Transmit
4
T
Receive
5
R
Receive
Step 7: Plugging the CSU into an Outlet
Depending on the type of line provided by the local telephone company, the
CSU can be supplied with -48 VDC power on the T1 wire pair from the
network.
If the CSU is not powered from the network, a KS22911-L1 power supply is
required.
Connect the power supply to the rear panel at TB1 as follows:
■ positive lead to terminal 15
■
-48 VDC lead to terminal 14
4-42
Installing the Channel Service Unit