3Com DSA-3CV1100-02 service manual Vcn Ap

14OVERVIEW

Figure 2 Transfer of Ethernet Frames in Visitor and Community Network

	Ethernet fram e
	H D LC fram e
	VD S L fram e
Ethernet	D ata frequency
fram es
VCN AP
	Voice call
Ethernet
	PO TS line

Voice frequency

Existing PO TS m etallic pair line

PBX

Voice calls

PO TS lines

	VCN AC
Ethernet	Ethernet
fram es
	Ethernet sw itch

The user’s Ethernet frames are encapsulated in HDLC frames carried in VDSL. Voice and data traffic are carried in their respective frequency ranges in the wire pair that connects the VCN AP to the VCN AC. Voice traffic, including facsimile and analog modem traffic, are not modified.

Figure 3 shows the front panel of the VCN AC. The 24 LAN ports of the VCN AC are connected to the Ethernet switch. Each port is an RJ-45 connector.