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4.7.1.2 Allocation
Before any LAN traffic may be transported over SDH it must be allocated to the required
tributary containers. Dependant upon the payload type selected for the SDH port the options
are as follows:
Figure 4.8 LAN Allocation options
If more than a single VC-3 or VC-12 bandwidth is required, groups of tributaries may be
allocated using either comma or dash notation or combinations as shown below:
For VC-3 groups: 1,2 or 1-2
For VC-12 groups: 111, 112, 113 or 111-133, 211-233
When allocating tributaries, the comma notation 111, 112, 113 means allocate the three
tributaries, 111 and 112 and 113. Similarly the dash notation 111-113 means allocate the
three tributaries 111 and 112 and 113.
Once the required tributaries have been allocated, the port must be changed to the UP state
before traffic will pass.
Note1:
klm
notation is a shorthand way of identifying each of the possible 63 VC-12
containers within the STM-1 frame.
k
represents the TUG-3 number and has the range 1-3.
l
represents the TUG-2 number and has the range 1-7 since there are 7 TUG-2 s in a TUG-
3.
m
represents the VC-12 within the TUG-2 and has the range 1-3 since each TUG-2
contains 3 VC-12s. Thus 111 is the first, and 373 is the last VC-12 in the STM-1 frame.
4.7.1.3 LCAS
Where tributaries have been grouped LCAS should be enabled to ensure correct operation
should a group member fail for any reason. LCAS should be disabled if only a single tributary
is used, or the remote equipment does not support LCAS.
4.7.1.4 Auto Negotiation
In most cases, Auto Negotiation may be enabled leaving the port to determine the speed and
duplex mode of the attached equipment. However, when connecting to Fast Ethernet ports,
which are fixed for 100M, e.g. Cisco equipment. Full Duplex operation, auto negotiation must
be disabled and the speed and duplex set manually.
Payload Type
Allocation Options
AU-4/VC-4
VC-4
AU-4/TUG-3/VC-3
1,2,3
AU-4/TUG-3/VC-12
use
klm
notation to define the tributaries
See Note1below
Summary of Contents for MetroLAN-1000
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