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Interface Modules (WAN)Passport 4400 Hardware Installation Manual
7-6
ISDN TA Interface Modules
The ISDN (integrated services digital network) basic rate interface (BRI) plug-
in modules will be used as primary network link connections to the WAN or for
backup in case of failure. ISDN interface modules may be placed in both Port 2
and Port 3.
There are two types of ISDN TA interface modules:
• ISDN TA U Interface (NTAU05AA)
• ISDN TA S/T Interface (NTAU06AA)
Both are accessed via an RJ-45 connector.
The data frame of the ISDN interface consists of three data channels (D, B1,
and B2). The D-channel is used to exchange control information between the
user and the network, as well as transferring data, at a data rate of 16 Kb/s.
Channels B1 and B2 are used to transfer data at the rate of 64 Kb/s.
ISDN TA U Interface Module
The interface module must be inserted into the unit with the component side
facing down.
Note:
Refer to Appendix B, Regulatory and Telephone Company
Requirements for agency and telephone company
requirements.
Figure 7-7. SDN TA U Interface Module, Connector, and Pin Assignments
Pin 1
RJ-45
RJ-45 Pin Assignments
1
2
4
5
6
7
8
3
Tip of Pair to Network
Tip of Pair to Network
Pins 1, 2, 3, 6, 7, 8 Not Connected
Bi-directional - Depending
on Mode of operation