Connecting the Control Unit to the Network Interface

Step 3: Connecting the CSU to the Network Interface

The terminal block (TB1) on the back of the CSU is the connecting point for T1 service lines, fault wires, and Ioopback wires. Also, if a local power supply is used, the TB1 is the termination spot for the power supply wires.

WARNING:

Voltages as high as 260 V can occur between the transmit and receive pairs of the T1 line.

Follow this procedure to connect the T1 lines to the CSU (see Figure 4-9):

D8W Cord

Fault

T1 Pair

Trunks

Local power supply leads

TB

1

2

3

4

5

6

7

8

9 10

11

12

13

14

15

16

17

J1

T1 R1 T

R

DC Loopback pair

To Network

Figure 4-9. Connecting the T1 Lines to the CSU

a.Connect the T1 service lines to terminals 1 through 5.

b.Connect the fault pair (if provided by the local telephone company) to terminals 8 and 9.

Installing the Channel Service Unit 4-37

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AT&T Release 2.0 manual Connecting the CSU to the Network Interface, Connecting the T1 Lines to the CSU