Getting Started
Page 6
conditions for either of these. The signal is terminated at the customer premises via a
Network Terminator (NT).
The DLS 50 simulates the physical parameters of the U-interface in order to stress test
U-interface transmission products.
2.2 ANSI Specifications
ANSI specification T1.601 describes the physical characteristics of the two wire ISDN
U-Interface. Described are the limits (pulse masks etc.) of the signals as they are
specified on the U-interface, the physical cable specifications and the testing procedures
for devices which connect to the ISDN U-Interface.
Similar specifications have also been drafted by ETSI for the two wire U-Interface.
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