Connecting the Control Unit to the Network Interface

Table 4-12. Switch Settings in Hybrid/PBX Mode: Network and Equipment

are D4 Framed

Switch

 

 

 

Position

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

6

7

8

 

 

 

 

 

 

 

 

 

 

 

 

 

5

down

down

down

up

up

down

up

up

 

 

 

 

 

 

 

 

 

 

 

6

up

up

up

up

down

up

up

up

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Set the Power Option Switch

Open the top panel of the ESF T1 CSU and set the power option switch to one of the following:

span power (SP)

dry loop (DL), local power

wet loop (WL), local power

CAUTION:

Connecting an ESF T1 CSU that is provisioned for wet loop to a digital microwave, digital multiplexer, or fiber optics can damage the equipment.

Connecting an ESF T1 CSU that is provisioned for the wet loop option with span-line power present can damage the CSU.

Therefore, use the wet loop option only in private networks with user- owned facilities.

Local power is required for total unit operation no matter which method of power is setected.

Select the dry loop option in almost all cases. If span-line power is provided and the telephone company agrees, you can set the CSU for SP. However, most telephone companies do not provide span- line power for new installations.

4-24Installing the Channel Service Unit

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AT&T Release 2.0 manual Set the Power Option Switch