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FCC Part 68 and Telephone Company Procedures and Requirements for DSU, T1, and ISDN Interfaces
FCC Part 68 and Telephone Company Procedures and 
Requirements for DSU, T1, and ISDN Interfaces
Before You Begin
Before a Vanguard 6435/6455 can be connected to the network, you must do the 
following:
• Provide the local telephone company with the equipment’s registration 
number
• Order the proper connections 
How to Order 
Connections
To order the proper connections, provide the telephone company with the following 
information:
• Interface type
• Required USOC jack connector number 
• Service code
• Facility interface codes
Troubleshooting 
Your Connection
If any of your equipment is not operating correctly, immediately remove it from the 
telephone line before damaging the network. If the telephone company is aware of 
the problem, they may temporarily disconnect your service. Whenever possible, the 
telephone company notifies you in advance of the disconnection.
If advance notice is not feasible, you are notified as soon as possible. Once notified, 
you can correct the problem. If necessary, it is your right to file a complaint with the 
FCC.
 Interface Type
USOC Jack 
Connector
Service 
Code
Facility Interface 
Code
56-kbps digital interface
RJ48S
6.0F
04DU5-56
ISDN U Interface
RJ49C
6.0Y
02lS5
ISDN S/T Interface
--------
6.0F
02lS5
Fractional T1 Interface
RJ48C
6.0F
04DU9-BN
04DU9-2SN