Chapter 15, Digital line unit (dlu) - rex-brd0023, Aws1024 meridian, aws1025 norstar, aws1026 lucent – Nortel Networks DCT1900 User Manual
Page 219: 1 general, 2 board description
Technical Product Manual - DCT1900
Installation Instructions, Digital Line Unit (DLU) - REX-BRD0023
Install-DCT1900/R8/mw
15-1
© 2000-2005
C
HAPTER
15
Digital Line Unit (DLU) - REX-BRD0023
AWS1024 Meridian, AWS1025 Norstar, AWS1026 Lucent
15.1
General
There are 12 transformer-isolated digital front ends (ports) on the board that provide 12 individual
digital lines. These digital lines can support up to 12 Portable Telephones.
Maintenance
Upgrades and re-programming of the DLU board’s flash memory are done via the RS232 serial
cable and the serial port on the face of the DLU board (COM 1). The board does not need to be
removed from the system during reprogramming but all twelve ports will be out of service during
this process. The RJ-45 connectors should be disconnected from the DLU board before
downloading software.
The boards may be inserted into or removed from a live system. Other boards already in the
system however, may reset during live insertion.
The DLU will come pre-programed with software specific to each PBX. The DLU board will have a
specific part number for each PBX it is to integrate with.
The DLU is programable to accommodate the need for software enhancements and fixes.
Note:
Boards should be inserted /removed one at a time. All connections to the RJ45 connectors and the
DB9 connector should be removed prior to live insertion or removal.
15.2
Board Description
Jumpers
Not applicable
Cables
The DLU interfaces via cable set AWS1019. Each cable serves 2 boards.
Connectors
COM 1
: The RS232 serial port is for field service.
JP6 (ports 1 - 6)
: The RJ45 connectors on the front end are for twisted pair
connections to the PBX. There are 12 connectors, one for each
JP7 (ports 7 - 12)
DLC. (The Tip/Ring connections appear on pair 1 (pins 4 and 5)
of the RJ45 connector).
JP5
: Backplane connector, female DIN96 R type.
LEDs
LED1
Green
: Normally on. Power On LED
LED2
Red
: Normally off. Watch–dog LED
LED3
Red
: Normally off. Board not polled LED
LED4
Red
: Normally off. Board Error LED.