Network Management Control Bus; Fuse Alarm; System Alarm Output Pins - ADC HIGAIN HDSL2 Manual

Appendix A - Specifications
The HDSL2 span is accessed on pins 26 and 27 which are assigned to Loop 2 in 4W HDSL
circuits.

Network Management Control Bus

The H2TU-C provides a Network Management Control Bus on pin 46 of the card-edge connector. This allows the
various management system protocols to manage the H2TU-C through the HMU-319 HiGain Management Unit.
Whenever the H2TU-C is under management, the MNGD message displays periodically on the front-panel display.
Some H2TU-C-231 List 1F features are affected when it is under management. Consult the
management unit practice for further information (see
page 66).

Fuse Alarm

Pin 32 on the card-edge connector is a fuse alarm that is driven to -48 Vdc through a diode whenever the onboard
fuse opens.

System Alarm Output Pins

Pins 20 and 21 on the card-edge connector (see
signals.
62
"Appendix D - Product Support" on
Figure 33 on page 61) are the H2TU-C-231 system alarm output
October 2, 2000
152-231-116-01, Revision 01
H2TU-C-231 List 1F