Appendix A - Specifications152-388-100-02, Issue 2

LOOP ATTENUATION

Each loop has no more than 35 dB of loss at 196 kHz, with driving and terminating impedances of 135Ω (see Table 19 below).

Table 19. HDSL2 Cable Attenuation Chart

Cable Gauge

Loss at 196 kHz (dB/kft)

Ω per kft

 

 

 

26/0.4 mm

3.88

83

24/0.51 mm

2.84

52

22/0.61 mm

2.18

32

19/0.91 mm

1.54

16

 

 

 

HIGAIN LINE UNIT CARD-EDGE CONNECTOR

Figure 28 shows the card-edge connectors on the HiGain Line Unit. Active pins are highlighted in black.

 

219

119

Frame ground

 

Ground

218

118

Ground

 

-48Vdc

217

117

Fuse alarm*

 

 

216

116

 

 

 

215

115

Ring 1

DSX-1 OUT

 

214

114

Tip 1

 

 

213 113

212 112

211

111

 

210

110

Ring

209

109

DSX-1 IN

Tip

208

108

 

207

107

Factory burn-in

206

106

 

205

105

 

204 104 Management bus

203 103

202

102

Ring 1

201

101

HDSL2 Span

Tip 1

200100

*Fuse alarm is normally floating (0 to 80 Vdc max.) and at -48 Vdc (10 mA max.) when activated.

Figure 28. HiGain Line Unit Card-Edge Connector

Network Management Control Bus

The H2TU-C-388 provides a Network Management Control Bus on pin 104 of the card-edge connector. This allows the various ADC Management System protocols to manage the H2TU-C through the HMU-319 HiGain Management Unit. Whenever the H2TU-C-388 is under management, the MNGD message displays periodically on the front-panel display.

Some HiGain Line Unit features are affected when it is under management. Consult the management unit practice for further information.

50

June 6, 2000

H2TU-C-388 List 1