3 call routing, 1 calls originating from an hsu port, Call routing -7 – Zhone Technologies 600 User Manual
Page 117: Calls originating from an hsu port -7, Network and user side protocols -7, Isdn-pri card introduction, Figure 5-5. network and user side protocols
Server Cards
5-7
ISDN-PRI Card
Introduction
Figure 5-5 shows how the system overcomes these disadvantages. Note that the configuration
in Figure 5-5 is identical to the one in Figure 5-3.
Figure 5-5 highlights the ability of the system to be able to set the protocol between network
side and user side for each D channel it uses. Since the PBX can only run the user side
protocol, the system must run the network side protocol on the D channel connected to the
PBX. However, on the D channels connected to the carrier switches, the system must run the
user side protocol.
Figure 5-5. Network and User Side Protocols
5.1.3
Call Routing
The system can be simultaneously connected to several network and user side ISDN PRI
facilities and to a user’s data terminal equipment (DTE) such as a video codec or a LAN router.
The DTE is typically connected through one or more of the system’s HSU cards.
5.1.3.1
Calls Originating from an HSU Port
Any call originating from an HSU port must be associated with a call profile (see Call Profiles
section). The call profile specifies which D channel is to carry the call. The system will always
route an outgoing HSU call to B channels controlled by the D channel specified in the call
profile. If no B channels are available, the call will not be placed.
Carrier A
ISDN Switch
Carrier B
ISDN Switch
User Side
User Side
User Side
Network Side
Network Side
Network Side
IAD
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