Innovative Vct Technology; Vbs Realizes Precise User Location - Zte ZXR10 5900 Product Description

ZXR10 5900 5200 Product Description
2.3

Innovative VCT Technology

VCT (Virtual Connection Test) designed based upon hardware detects the connection
fault. It realizes link diagnosis via TDR (Time Domain Reflection), and gives judgment on
the link faults for example open circuit, short circuit, impendence unmatched and normal
circuit. Besides, it can calculate the distance of the failed point of the link.
By using VCT technology, ZTE ZXR10 59/52 series Ethernet switches can carry out
remote maintenance to links to find out the open circuit, break circuit and the error for
detecting fault location is within 1 meter. Via VCT circuit, ZXR10 59/52 series Ethernet
switches can actively eliminate the incorrect customer configuration, and find out the
distance between the failed link and the equipment and port. It can locate and eliminate
most failures in network management center, which simplifies network maintenance and
reduces the costs and difficulties in network operation and maintenance.
2.4

VBS Realizes Precise User Location

VBAS (Virtual Broadband Access Server) is a query protocol used between IP-DSLAM
and BRAS.
It uses L2 end-to-end communication between BRAS and IP-DSLAM, i.e. the port
information query and responding message are directly encapsulated in L2 Ethernet
data frame, configure related DSLAM of VLAN on BAS and generates VBAS protocol in
the course of PPPoE session, that is, according to user's VLAN, map to the
corresponding DSLAM, and BAS imitates user route label query to DSLAM actively, then
DSLAM gives BAS the route label of the responding customer. Here 59/52 series
switches are working as DSLAM device.
The implementation procedure of VBAS interaction:
User host initiates broadcasting session to generate data packet to ask for setting

up link, and wait for BAS responding.
After one or more than one BAS devices receive broadcasting, the data packets

providing by service are sent to user host if services can be provided.
 Customer host selects one BAS as per a certain rule, and send unicast session to
require data packet.
 When the selected BAS received the session for requiring data packet, it will
generate an exclusive Session ID, and then goes into PPP session stage after
sending data packet for confirmation to customer host.
 When BAS sends data packet for confirmation, it will send VBAS request packet to
DSLAM for checking which physical port of DSLAM the MAC address of user host
comes from.
 When DSLAM receives the request data packet from VBAS, it will send VBAS
responding data packet to BAS, and the relations between the MAC address and
DSLAM physical port will return.
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