ADC HDSL4 - Manual (Page 69)

LTPH-UM-1031-03, Issue 3 Appendix A - Specifications
H4TU-C-319 List 1 September 12, 2003 61
M
AXIMUM
C
URRENT
D
RAIN
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.
L OOP A TTENUATION , I NSERTION L OSS , AND R EACH
For Span 1, each loop has no more than 47 dB of insertion loss at 196 kHz, with driving and terminating
impedances of 135
Ω, 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 135
Ω. This is equivalent to no more than 31 dB loop attenuation.
Table 21. HDSL4 Reach Chart
Cable Gauge
Insertion Loss (a) at
196 kHz (dB/kft)
(a) Insertion Loss = 1.38 times loop attenuation
Loop Attenuation
(dB/kft)
Maximum Reach (kft)
Span 1
Maximum Reach (kft)
Span 2 and Span 3
Ω
per kft
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