APC IP DSLAM Betriebsanweisung PDF herunterladen (Seite 31)

EDA 1200 Services

Q, S and C VLAN tags are shown in Figure 20 on page 26. Frame from the

End-user reaches the Access Node, the Q tag is removed and one (S) or two

(S and C) VLAN tags are added to the frame. The frame is sent into the Access

Domain where the S VLAN tag is used as the VLAN ID, priority and Ethertype.

When the frame leaves the Access Domain both VLAN tags are removed

(either by an IP DSLAM or by a router). However, the node can read the C

VLAN tag and use the information further if required.

An example of the VLAN based traffic mapping is illustrated in Figure 21 on

page 27. There are two End-users each with two services, one for video and

one for data. For both End-users, the video traffic is tagged with VLAN ID 8 and

the data traffic is tagged with VLAN ID 7.

The Video Server is connected to S VLAN 12. Therefore the video traffic for

both End-users is mapped from S VLAN 12 to Q VLAN 8 (and the other way

around for the upstream).

The data traffic for both End-users is transferred through a BRAS connected

(configured) to S VLAN 11. In this case a C VLAN is used with a separate value

for each end user. In End-user 1’s case the traffic is mapped from Q ID 7 to

S ID 11 and C ID 5 in the upstream direction and the other way around in the

downstream direction. In End-user 2’s case the traffic is mapped from Q ID 7

to S ID 11 and C ID 6 in the upstream direction and the other way around

in the downstream direction.

Figure 21 VLAN Based Traffic Mapping

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APC IP DSLAM Betriebsanweisung Seite 31