CHAPTER 2.
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2.3.2.7 4BRI
The 4BRI (Basic Rate Interface) provides the digital trunk line. A 4BRI provides 2B + D
ISDN BRI and functions as the Q-SIG. This board transmits voice via the trunk line and a
channel transmits the voice data of 64 Kbps. The 4BRI is not available for MP20S.
Major Functions
The 4BRI performs the functions below:
Processes the T/S0 mode signals by programming.
Uses 4 port T mode or selectively uses 4 port S0
Resistor Terminations for S0 line (100
).
Endures the ITU-recommended level of surge.
Protects the output port by monitoring line signals.
Crystal-less wander and jitter attenuation/compensation to TR62411.
Specifications
The specifications of the 4BRI are as follows:
Four trunk line port
T: 8 channels
S: 8 channels
Front View of 4BRI
The front view of the 4BRI is shown in the figure below:
Figure 2.14 Front View of the 4BRI
The components on the front panel of the 4BRI have the functions below:
4BRI
P1-T
RUN
P2-T
P3-T
P4-T
P1-S
P2-S
P3-S
P4-S
ACT
