3.3.3.3.3. Trunking Gateway 
Overview
- ISDN -> Basic Rate Interface (BRI 1)
- ISDN -> Basic Rate Interface (BRI 2)
- ISDN -> Status
- Codec Parameter Trunking and Subscriber Gateway
ISDN -> Basic Rate Interface (BRI 1)
The trunking gateway is linked to the public network via the BRI 1
port and synchronizes itself with the clock pulse received.
Figure 67. Mediatrix Gateway Trunking - ISDN -> Basic Rate Interface 1
ISDN -> Basic Rate Interface (BRI 2)
The BRI 2 port is used to forward the clock pulse to the subscriber
gateway.
Figure 68. Mediatrix 44xx Gateway Trunking - ISDN -> Basic Rate Interface 2
ISDN -> Status
A status window indicates that clocking is performed via the BRI1
port which is connected to the public network. It also shows that the
link on the BRI 2 port for transferring the clock pulse to the subscriber
gateway is working (layer-3 signaling is not used for this link).
Figure 69. Mediatrix 44xx Gateway Trunking - ISDN -> Status
