CS-03, Part VI — Requirements for Integrated Services Digital Network Terminal Equipment
Figure 3.2 describes the test circuit to record DC potentials at the network interface.
Figure 3.3(a) describes the test circuit to verify that the output power of an all-ones unframed digital signal in the 3 kHz bands at 772 kHz and 1.544 MHz is within the stated limitations.
Figure 3.3(b) describes an alternative test circuit to the test circuit illustrated in Figure 3.3(a).
Figure 3.3(c) describes the test circuit to measure the amplitude of the Primary Rate Access (PRA) pulse.
Figure 3.3(d) specifies the shape of an isolated output pulse for approved terminal equipment.
Figure 3.3(e) describes the test circuit to record a single positive pulse. The recorded pulse shape has to meet the criteria specified in Figure 3.3(d). Same circuit is used to record a single negative pulse. Both positive and negative pulses shall comply with the specified pulse mask.
Figure 3.4(a) shows the transverse balance requirements that terminal equipment intended to connect to ISDN access, either Basic Rate Access or Primary Rate Access, shall comply.
Figure 3.4(b) describes the test circuit to determine the transverse balance of digital terminal equipment.
Figure 3.5(a) describes the test circuit to calculate the maximum equivalent power of the encoded analog signals at the network interface.
Figure 3.5(b) describes the test circuit to determine the equivalent power of encoded analog signals in the 2450 Hz to 2750 Hz and 800 Hz to 2450 Hz signalling bands.
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