ADC HDSL4 - Manual (Page 71)

LTPH-UM-1031-03, Issue 3 Appendix A - Specifications
H4TU-C-319 List 1 September 12, 2003 63
System Alarm Output Pin
Pin H on the card-edge connector (see Figure 33 on page 63 ) is the H4TU-C-319 System Alarm output pin. The
following notes apply to Pin H:
• Pin H replaces the Local Loss of Signal (LLOS) on normal high-density (3192) repeaters.
• The normally floating output of Pin H can connect to pin 1 of the 1184 or 3192-9F Alarm Card in position 29
of the High Density (HD) shelf.
• The H4TU-C forces pin H to +5Vdc (maximum of 10 mA) for a system alarm condition. Pin H then remains
at +5 Vdc for the duration of the alarm condition.
• If the Wescom 1184 Alarm Card is installed in the shelf, its LOS LED lights for every minor alarm
(MNRALM).
• The H4TU-C Status LED flashes red for the duration of a system alarm condition.
• Setting the ALM option to DIS only prevents the system alarm bus on Pin H from being activated for a system
alarm event. The Status LED still flashes red and the ALRM message still displays.
C RAFT P ORT
Figure 33 shows the pinout for the craft port connection and its connection to a DB-9 or DB-25 connector on a
maintenance terminal.
Figure 33. RS-232 Craft Port Pinouts
Pin H must never be taken above +5 Vdc or below -60 Vdc.
H4TU-C-319
DB-9 Connector
(DCE)
RD (Receive Data)
TD (Transmit Data) 2
3
5
DB-9 Connector
(DTE)
DB-25 Connector
(DTE)
2
3
5
3
2
7
GND
Terminal
Terminal