Comdial DXP Series Installing And Using page 15

Installing And Using System-To-System Networking
Installing System-To-System Networking
Installing the network requires a complete understanding of the elements discussed in the following paragraphs.
Further, you should refer to the system manuals listed in the previous paragraph titled, Detailing The Related
Publications, for installation details about the various system components.
Detailing The Equipment Needs
•
The network requires either DXP, DXP Plus, or FX Series digital communications equipment installed at the
node sites and a DXP Plus system at the hub site. (Because of its call handling capability, Comdial engineers,
highly recommend that you install a DXP Plus system at the hub site; however, it is not exclusively required.)
•
Every node site requires a minimum of one DXNET or FXNET network interface board for every link to the
hub.
NOTE: The call traffic volume determines the number of links needed to connect each node to the hub. Some sites
may only require one link while others may require more. Keep in mind that each link can support up to
23 channels carrying 23 simultaneous calls. If the expected network load is higher, you must arrange for
multiple links. When you do this, you have certain system maximums that you must consider. These
considerations include: the maximum channel capacity and the maximum number of T1 boards that the
hub supports. Remember, the hub must make a channel available to match every node channel.
A DXP supports a maximum of 128 channels and six T1 boards; however, since the full T1 capacity equals
138 channels, which exceeds the system's 128 channel maximum, one of the T1 boards must be fractional.
The DXP Plus supports a maximum of 230 channels and 10 T1 boards. In this case DXP Plus systems can
make all 230 channels available over the maximum of 10 T1 boards.
Remember also, the total channel capacity available for network links at both the hub and the nodes is
reduced by however many CO lines you connect at these systems.
•
Each node site requires a synchronization card (DXOPT–SYN); however, this is not a requirement at the hub
site.
NOTE: If you also have the hub connected to the service provider through regular T1 boards for normal
outbound call traffic, you will need to install a DXOPT–SYN card in the hub system for that application.
•
The hub and every node system must be running special networking software with a revision of 12A or later.
•
A network can contain a maximum of six node systems and one hub system. While the hub can serve stations
and act as another node in the network, there could be network situations that require you to dedicate the hub as
the network server without station connections of its own.
Installing System-To-System Networking — 15
IMI89–280