7
4
The VDSL Port
The data rate of the 10Base-S VDSL port on
a
LAN Extender Module
(hereon referred to as the VDSL port) depends on the distance in use. This
includes bandwidth limiting, via management, of the data rate for various
distances. The following graph illustrates the correlation between the distance
and the speed. The sum of the Upstream and Downstream data rates is fixed by
the distance of the application. For example, if an application requires 1.5 Km,
there will be a maximum of 15 Mbps to distribute
between
the Upstream and
Downstream data rates. If Synchronous data rates are desired, configure 7.5
Mbps for Upstream and 7.5 Mbps for Downstream. Otherwise, speed can be
distributed in any combination between the Upstream and Downstream rates,
making data rates Asynchronous (12.5 Mbps and 2.1; 5 Mbps and 10 Mbps, etc).
The following chart provides examples of Synchronous and Asynchronous data
rates at various distances.
Unmanaged Modules
Before installing, configure an unmanaged LAN Extender Module for its
hardware-selectable features via DIP switches located at position
S1.
Refer
to diagram and switch chart below for settings.
F
EATURE
S
WITCH
F
UNCTION
D
EFAULT
AN
S1
Enables/disables Auto-Negotiation.
ON
Flow
Control
S3
Enables/disables Flow Control.
OFF
Selective
Advertising
S4
Used with Auto-Negotiation to advertise a specific
speed and duplex as determined by S5 and S6
OFF
Speed
S5
When ON, the LAN Extender Module operates at
100 Mbps.
When OFF, the LAN Extender Module operates at
10 Mbps.
OFF
Duplex
S6
When ON, the LAN Extender Module operates at
Full-Duplex.
When OFF, the LAN Extender Module operates at
Half-Duplex.
OFF
Host
S8
Sets the CO module as a HOST, allowing manage-
ment of the CPE (remote) module.
This switch is N/A for the CPE module; must be OFF.
ON
(CO module)
OFF
(CPE module)
Link Fault
Propagate
S9
Enables/disables Link Fault Propagate;
This switch is N/A for the CPE module; must be OFF.
OFF
S2 and S7 are reserved for future use — DO NOT CHANGE
S5 and S6 are only applicable if AN is set to OFF, or when using Selective Advertising.
S1
Enable
1 2 3 4 5 6 7 8
Disable
9
}
Flow Control
}
Auto
-Negotiation
}
}
Selective Advertising
Speed
}
Duplex
}
}
Host*
}
Link F
ault Propagate
}
Reserved
Reserved
25 Mbps
MAX
Speed
6.5 Mbps
500
m
10 Mbps
2
Km
MAX Distance
1.5
Km
15 Mbps
20 Mbps
1
Km
1.75
Km
Distance
Data Rate Type
Upstream
Data Rate
Downstream
Data Rate
Approx. Total
of Data Rates
500 m
Synchronous
12.5 Mbps
12.5 Mbps
25 Mbps
1.5 Km
Asynchronous
2.1 Mbps
12.5 Mbps
15 Mbps
2 Km
Asynchronous
2.1 Mbps
4.25 Mbps
6.5 Mbps
N O T E
Distances and speeds are approximate and depend on wiring qual-
ity and gauge. The actual Ethernet speeds are lower than the
speeds listed due to VDSL overhead (10% overhead). The distances
listed in the chart are less than or equal to the values listed.
Содержание LMC5178A
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