
4.7.2 Signal Flow and Timeslot Allocation
The services of multiple users that are received from different external ports on an Ethernet
board are tagged with different VLAN IDs and then transmitted on the same VCTRUNK. In
this way, the data of different users is isolated. After the data arrives at the sink node, the VLAN
tags are stripped.
shows the signal flow of the VCTRUNK-shared EVPL (VLAN) services and the
timeslot allocation to the VCTRUNK-shared EVPL (VLAN) services.
For the method of calculating the bandwidth of the Ethernet services carried by a VCTRUNK,
see
6.3 Ethernet Service Bandwidths Carried by VCTRUNKs of Ethernet Boards
.
Figure 4-29
Signal flow and timeslot allocation
PORT1
NE1:EFS8
VCTRUNK1
VCTRUNK1
PORT1
NE2:EFS8
SDH
User D1
EVPL1
VC4-4:VC12:1-10
EVPL2
EVPL1
EVPL2
PORT2
User E1
User D2
PORT2
User E2
VC4-1:VC12:1-10 VC4-4:VC12:1-10
l
The EVPL services of user D and user E that share VCTRUNK1 occupy the first to tenth
VC-12 timeslots of the first VC-4 (VC4-1:VC12:1-10) on the SDH link from NE1 to NE2.
l
The services are added and dropped by using the first to tenth VC-12 timeslots of the fourth
VC-4 (VC4-1:VC12:1-10) on the EFS8 board of NE1 and the first to tenth VC-12 timeslots
of the fourth VC-4 (VC4-1:VC12:1-10) on the EFS8 board of NE2.
Table 4-24
Parameters of external ports on the Ethernet boards
Parameter
NE1
NE2
Board
EFS8
EFS8
Port
PORT1
PORT2
PORT1
PORT2
Enabled/
Disabled
Enabled
Enabled
Enabled
Enabled
Working Mode
Auto-
Negotiation
Auto-
Negotiation
Auto-
Negotiation
Auto-
Negotiation
Maximum
Frame Length
1522
1522
1522
1522
TAG
Access
Access
Access
Access
Entry Detection
Enabled
Enabled
Enabled
Enabled
Default VLAN
ID
100
200
100
200
4 Configuring Ethernet Services
OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
4-74
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 02 (2011-06-30)