Section 2: PCB Installation and Startup
Aspire S Hardware Manual
Section 2: PCB Installation and Startup
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2
BRI (2BRIU-S) Interface PCB
Check with your NEC Sales Representative for availability of this PCB.
The BRI PCB provides:
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2 2-Channel Circuits (2B + D) con
fi
gured as T-Bus
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64 Kb/s Clear B-Channel and 16 Kb/s D-Channel
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4 trunk/extension status LEDs
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1 PCB status LED
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1 run/block switch
The BRI Interface PCB uses a single universal slot. A maximum of 2 BRIU-S PCBs can be installed when
used as T-Bus. Each PCB connects to the network via an NTI Network Termination. With the maximum
number of PCBs installed, the following can be provided:
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The 2BRIU-S, when used as T-Bus, provides 2 BRI circuits and 4 BRI channels. A maximum of 7
ISDN terminals can be connected between an external DSU and the 2BRIU-S PCB.
The trunk circuit can be connected to either an ISDN trunk or ISDN telephone set, depending on the SW102
and SW202 switch settings.
Setting the SW100-SW200 Switches
In the following cases, the SW100-SW200 switches should be set to the ON position:
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When the channel is assigned as a T-Bus Point-to-Point.
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With T-Bus Point-to-Multipoint and if the system is connected at the end of the multipoint.
Otherwise, the SW100-SW200 switches should be set to the OFF position.
Switch
Name
Switch
Position
Result
Comments
SW102
SW202
T
T-Bus Connection
S
S-Bus Connection
Not currently used.
SW100
SW200
ON
Termination resistor is ON
This switch should be set to ON:
1. When T-Bus with Point-to-Point is selected.
2. When T-Bus with Point-to-Multipoint is selected
and if the connection to the Aspire system at the last
port of the Bus connection.
OFF
Termination resistor is OFF
When T-Bus with Point-to-Multipoint is selected and if
the Aspire system is not connected to the last port of the
Bus connection, this switch should be OFF.
CN102
CN202
ON
With S-Bus selected, the Feeding
Power is supplied to the terminal.
- Not currently used. -
If S-Bus is selected, this switch should be ON.
OFF
With S-Bus selected, the Feeding
Power is not supplied to the terminal.
- Not currently used. -
If T-Bus is selected, this switch should be OFF.