I'm working on a project where I need to make a network for all PCs in the site. I need about 8 Ethernet sockets in each office of the site. I found that there's already two Ethernet sockets in each office but they are connected to VoIP phones (Siemens openstage 15) .
So, I bought d-link switches (des 1008a) for each office and decided to expand the network inside each office by connecting one of the already existing sockets to the dlink switch and then connect the PCs and phones to the new switch.
The problem arose when I connected the VoIP phone to the dlink switch, it didn't boot up. I discovered that the phone is powered through Power Over Ethernet and when connected to the normal non-PoE dlink switch it doesn't work even though the main cable entering to the DLink switch is coming from a POE switch. The phone works only when connected to the cable coming from the POE switch.
When I searched for the power specs of this specific phone model (Siemens Openstage 15) I found these specs ..
How can I solve this situation without expanding new cables from the main POE switch?