ADC H4TU-C-319 List 1 Line Unit user manual Maximum Current Drain, HDSL4 Reach Chart, KHz dB/kft

LTPH-UM-1031-03, Issue 3 Appendix A - Specifications

MAXIMUM CURRENT DRAIN

The maximum current drain is the maximum current drawn from the shelf power supply when it is at its minimum voltage (-42.5 Vdc). This determines the shelf fusing requirements. Use the -42.5 Vdc current data in Table 21 to determine the shelf fusing requirements for your particular H4TU-C applications.

LOOP ATTENUATION, INSERTION LOSS, AND REACH

For Span 1, each loop has no more than 47 dB of insertion loss at 196 kHz, with driving and terminating impedances of 135Ω, as shown in Table 21 below. This is equivalent to no more than 34 dB loop attenuation.

For Span 2 and Span 3, each loop has no more than 43 dB of insertion loss at 196 kHz, with driving and terminating impedances of 135Ω. This is equivalent to no more than 31 dB loop attenuation.

Table 21. HDSL4 Reach Chart

Cable Gauge	Insertion Loss (a) at		Loop Attenuation	Maximum Reach (kft)	Maximum Reach (kft)	Ω per kft
	196	kHz (dB/kft)	(dB/kft)	Span 1	Span 2 and Span 3
26/0.4 mm		3.88	2.8	12	11.0	83
24/0.51 mm		2.84	2.0	16	15.0	52
22/0.61 mm		2.18	1.6	21	20.6	32
19/0.91 mm		1.54	1.1	29	27.8	16

(a) Insertion Loss = 1.38 times loop attenuation

H4TU-C-319 List 1 September 12, 2003 61