Images
Figure 3.2: 1.544 Mbps Pulse Repetition Rate Measurement
Figure 3.2 describes the test circuit to verify the free-running pulse repetition rate of the terminal equipment.
Figure 3.3(a) (Ref. EIA/TIA 547-1989): Isolated Pulse Template and Corner Points for DSX-1 Equipment
Figure 3.3(a) specifies the shape of an isolated output pulse for approved terminal equipment.
Figure 3.3(b): 1.544 Mbps Pulse Template Measurement
Figure 3.3(b) describes the test circuit to record a single positive pulse. The recorded pulse shape has to meet the criteria specified in Figure 3.3(a). The 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: 1.544 Mbps Output Power Measurement
Figure 3.4 describes the test circuit to verify the output power of an all ones unframed digital signal in the 3 kHz bands centred at 772 kHz and 1.544 MHz.
Figure 3.5(a): 1.544 Mbps Signalling Duration Measurement
Figure 3.5(a) describes the test circuit to verify the minimum active signalling duration.
Figure 3.5(b): 1.544 Mbps Signalling Duration Measurement
Figure 3.5(b) describes the test circuit to verify that terminal equipment signals the network upon entering the off-hook state.
Figure 3.6(a): 1.544 Mbps On-hook Level Measurement
Figure 3.6(a) describes the test circuit to verify the equivalent analog level content in the on-hook state for subrate, 1.544 Mb/s TE, 1.544 Mb/s protective circuitry and 1.544 Mb/s reverse battery.
Figure 3.6(b): 1.544 Mbps Encoded Analog Content Measurement
Figure 3.6(b) describes the test circuit to verify the maximum equivalent power of the encoded analog content of the transmitted digital signal.
Figure 3.6(c): 1.544 Mbps Signalling Interface Measurement
Figure 3.6(c) describes the test circuit to verify the signal power contained in the encoded analog signal in both the signalling band and in the guardband.
Figure 3.6(d): Through Transmission (Digital) Measurement
Figure 3.6(d) describes the test circuit to verify that the through-transmission connections of the digital terminal equipment do not provide gain in excess of the limits in Section 3.6.5.1.
Figure 3.6(e): Arrangement for Figures 3.6(d) and (f)
Figure 3.6(e) provides the digital terminal equipment arrangement for through transmission digital (see Figure 3.6(d)) and signal frequency guardbands digital measurements (see Figure 3.6(f)).
Figure 3.6(f): Through Transmission (Signal Frequency Guardbands, Digital) Measurement
Figure 3.6(f) describes the test circuit to compare the insertion loss for digital equipment in the 800 Hz to 2450 Hz and 2450 Hz to 2750 Hz frequency bands.