Nortel Networks DCT1900 - Manual (Page 199)

Technical Product Manual - DCT1900
Installation Instructions, Speech Link Unit (SLU) – REX-BRD0015 or ROFNB 157 16/1
Install-DCT1900/R8/mw 9-1
© 2000-2005
C HAPTER 9
Speech Link Unit (SLU) – REX-BRD0015 or ROFNB 157 16/1
9.1 General
The SLU is a combination of an SPU and a CLU on one board. The CLU part is used to control up
to 8 Base Stations via twisted pair cables with a maximum length of 1.3 miles. The SPU section
has 8 speed circuits.
Maintenance
The SLU contains the following field–exchangeable parts (see Figure 9–1):
z SPU Firmware, Board Controller - RYSNB 101 20
z CLU Firmware, Board Controller - RYSNB 101 19
z SPU-S DSP Firmware, Board Controller - REX-SW0013 or RYS 105 446
9.2 Board Description
Straps
Not applicable.
Connectors
The CLU part has 8 connectors at the front by which the CLCs are connected to the Base Stations
and 1 connector for input of the Base Station power:
CLC 1–8 : To connect Base Station 1 to 8.
Base Station Power : To connect -48 volts from the MCCB for powering the Base
Stations.
The power connector does not have a polarity. It makes no difference which pin becomes plus or
minus.
LEDs
SPU part:
LED1
Green : Normally on. Power On LED SPU
LED2 Red : Normally off. Watch–dog LED SPU
LED3 Red : Normally off. Board not polled LED SPU
LED4 Red : Normally off. Board Error LED SPU
CLU part:
LED1
Green : Normally on. Power On LED CLU
LED2 Red : Normally off. Watch–dog LED CLU
LED3 Red : Normally off. Board not polled LED CLU
LED4 Red : Normally off. Base Station in NEW state or board error CLU