Specifications

Section 2: PCB Installation and Startup
Aspire S Hardware Manual Section 2: PCB Installation and Startup ◆ 2-29
2
BRI (2BRIU-S) Interface PCB (Figure 2-13)
Check with your NEC Sales Representative for availability of this PCB.
The BRI PCB provides:
● 2 2-Channel Circuits (2B + D) configured as T-Bus
● 64 Kb/s Clear B-Channel and 16 Kb/s D-Channel
● 4 trunk/extension status LEDs
● 1 PCB status LED
● 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:
● 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:
● When the channel is assigned as a T-Bus Point-to-Point.
● 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.