Comtech EF Data DMD1050 - Manual (Page 170)

DMD1050 Satellite Modem Board Ethernet Data Interface
MN-DMD1050 F–4
Revision 9
F.4 Point-to-Multipoint Applications
In many instances, customers need to connect multiple remote sites to a central hub, and here
again, the EEI provides exceptional value and ease of use. With its multi-port interface and daisy
chain capability, your hub router doesn’t need to know that there are multiple return paths. And
as your network grows, you won’t need to change your network configuration or buy additional
router blades for your hub. Simply add the new hub demod to the end of your existing daisy
chain and you can bring a new remote online without any disruption to the existing traffic.
Figure F-3 illustrates how the DMD50, DMD20, and MD2401 multi demod can be utilized in the
same network to provide a large outbound carrier and various return carriers, typical of an
internet café application.
DMD50
DMD20
MD2401
DMD50
Tx
52
Mbps
Rx
30
Mbps
Rx
10
Mbps
Router Router
Router
Router
Daisy Chain
Daisy Chain
Hub
LAN
Remote
LAN
Remote
LAN
Remote
LAN
Rx
2 Mbps
Rx
1 Mbps
DMD50
DMD50
Tx
30
Mbps
Rx
52
Mbps
Tx
10
Mbps
Rx
52
Mbps
Tx
2 Mbps Rx
52
Mbps
DMD50 Router
Remote
LAN
Tx
1 Mbps Rx
52
Mbps
DMD50 Router
Remote
LAN
Tx
512
Kbps
Rx
52
Mbps
DMD50 Router
Remote
LAN
Tx
128
Kbps
Rx
52
Mbps
Rx 512 Kbps
Rx
128
Kbps
Figure F-3 – Point to Multipoint – Large Outbound, Smaller Returns