The NT1 terminates the line coming from Telco (U interface) and converts
from a U interface (2 wire, RJ45) to an S/T interface (a 4 wire bus, also
RJ45.) It also provides Telco with a test point. The TA is a terminal
adapter, which converts the S/T interface into whatever interface your data
equipment requires, such as V.35. In practice, the two devices are often
combined in one box so the S/T interface is mainly a theoretical one. The
whole thing is roughly equivalent to a CSU/DSU for a T1, with the CSU
providing the necessary test point for Telco, and the DSU providing
interface conversion.
Hope this helps
-----Original Message-----
From: Montgomery, Robert WARCOM Contractor
[mailto:[EMAIL PROTECTED]]
Sent: Tuesday, June 27, 2000 11:58 AM
To: Cisco
Subject: NT1 v TA
What is the difference between an NT1 and a TA? Not having used either, I
see the are both "defined" as equipment that converts non-ISDN-compliant
signals... But I also see that the TA connects to the NT1.
Rob Montgomery CCNA MCP
IA Systems Analyst
Sytex, Inc./ Naval Special Warfare Command
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