ADTRAN 25 manual Circuit Actions Pack Type, ZTN78

MAINTENANCE

Table 4-F. Applicable Actions for Circuit Pack Options

ACTIONS FOR CIRCUIT PACK OPTIONS (See Circuit Pack Options—Table 4-E)

CIRCUIT	CP			ACTIONS
, PACK	TYPE	32	33	34	35	36	37	38
ZTN76	GS Board	●	●	●	●
ZTN77	LS Trunk	●	●	●	●
ZTN78	Tip/Ring Line		●	●
TN742	Analog Line		●	●	●	●
TN753	DID Trunk	●	●	●	●
TN760B	Tie Trunk	●	●	●			●	●
TN763	Aux Trunk		●	●
TN767	DS1 Interface	●	●	●				●

Note: TN747 same as ZTN76 and ZTN77. TN746B same as TN742.

Data Line Troubles

Symptoms:

Data terminals connected through the Data Line CP (TN726) are dead or are not functioning properly.

Procedures:

1.Check that the RS-232C connector on the Asynchronous Data Unit (ADU) is properly connected to the RS-232C connector on the data terminal. Always tighten connector screws and fasteners.

2.Check the terminal ac power connection.

3.Make sure that the connection to the ADU is a 4-pair modular plug.

4.Check the ADU ac power connection (see Steps 5, 6, and 7). An ADU connected to a port on the CPU/Memory CP must have a local ac power source. Briefly disconnect the ADU’s power cord.

5.If the ADU is not externally powered, check pin 20 (DTR signal on the

RS-232C connector) for presence of at least +7 volts relative to pin 7 (ground).

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