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Applications
What is the primary application for the Model 1068 Multi-Rate VDSL Ethernet Extender?
LAN Extension & Service Integration
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Patton's Model 1068 VDSL Modems provide up to 16 Mbps of high speed Ethernet and voice services
between LANs or other network-enabled devices over a single twisted-pair. The Model 1068 is the only
variable-rate asymmetrical/symmetrical standalone modem solution available today. The ability to select
various asymmetrical and symmetrical line rates enables the Model 1068 to satisfy a broad range of
applications. The Model 1068DV's line sharing capabilities allow users to download files from the Internet,
surf the WWW, and answer e-mail messages while talking on the phone or faxing documents.
Other Applications include:
• MTU/MDU Internet Services
• Network Backbones
• Remote Workstations and Equipment
• ISP Last Mile Extension
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Product Related Questions
How is the VDSL connection established?
Four steps are required to establish a communications link between the two Model 1068 Ethernet Extenders
(Local and Remote) and the respective network devices.
1) Connect the 10/100Base-TX devices to the Ethernet port of each 1068 unit.
2) Connect the POTS/ISDN device to the POTS/ISDN port of each 1068 unit (1068DV only)
3) Connect each end of the twisted-pair wire to the Link port of each 1068 unit.
4) Plug the 1068 power supplies into a suitable power source.
5) Plug the output jack of each power supply to the rear power jack of each 1068 unit.
Once powered up, a communications link is established between the two 1068 units and the VDSL LED on
each 1068 unit will glow solid green.
NOTE: If line rates are changed from their original settings, both CO (Central Office) and CP (Customer Premise) units
must be set to the same line rate/dip switch settings.
Does the Model 1068 include any management capabilities or test modes?
No, the Model 1068 does not have any management capabilities or test modes. However, it does feature
seven status LED indicators to provide operational status at a glance and assist with troubleshooting.
Why does the Model 1068 VDSL QOL/error light occasionally flash?
When the QOL/"error” LED flashes it signifies that error correction is taking place and data integrity is
maintained. It is possible for the error light to be constantly lit and the link will still function with data intact.
However, when the QOL/Error LED is continuously lit, the 1068’s are approaching their maximum distance
capabilities under the current environment and line rate. When the QOL is constantly lit, we recommend
switching the modem to a lower line rate to ensure the most reliable connection.
What are the distance limitations of the Model 1068 using different gauge wires?
At the default setting of 12.5 Mbps symmetrical, using 24 AWG (0.5 mm) wire, the Model 1068 is capable of
providing Ethernet extensions up to 4,656 ft (1.42 km) including the potential 328 ft (100 m) Ethernet
connections on both ends of the communications link. Using 26 AWG (0.4 mm) wire, the Model 1068 is
capable of providing Ethernet extensions up to 3,856 ft (1.18 km). Actual distance and link performance will
vary based on the environment (cross talk/noise) and type/gauge of wire used. The chart below shows an
example of how the gauge of wire affects the distance.
Approximate Distances at 12.5 Mbps (Default Setting)
Wire Gauge: AWG (mm) Distance: Feet (km)
26 AWG (0.4 mm) 3856’ (1.18 km)
24 AWG (0.5 mm) 4656’ (1.42 km)
22 AWG (0.64 mm) 5256’ (1.60 km)
20 AWG (0.81 mm) 5556’ (1.69 km)
18 AWG (1.00 mm) 5756’ (1.75 km)
16 AWG (1.29 mm) 5856’ (1.78 km)
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*NOTE: Distances are based on a minimum to no cross talk environment. This distance table includes the potential 328ft (100 m)
Ethernet connections on both ends of the communications link.
Can the line rate be altered on the Model 1068 to achieve lower bandwidths and/or longer
distances?
Yes, the line rate can be altered via dipswitches on the underside of the 1068 Standalone or on the topside
of the front card on the 1068RC. Distances will increase or decrease depending on the line rate selected.
The chart below shows the possible configurations.
†=Default setting
*NOTE: Distances are based on a minimum to no cross talk environment. This distance table includes the potential 328ft
(100 m) Ethernet connections on both ends of the communications link.
Line Rates Distance (24AWG)
Upstream
(Mbps)
1.56 4.17 6,656’ (2.03km)
1.56 9.38 5,756’ (1.75km)
2.34 16.67 5,556’ (1.69km)
Asymmetrical
Downstream
(Mbps)
Upstream
(Mbps)
312.50†
416.67
Line Rates Distance (24AWG)
16.25
29.38
Symmetrical
Downstream
(Mbps)
6.25 4,956’ (1.51km)
9.38 4,806’ (1.46km)
12.50 4,656’ (1.42km)
16.67 3,956’ (1.21km)
What is the difference between Asymmetrical and Symmetrical modes?
In Symmetrical mode, data travels upstream (to the Internet or data source) and downstream (from the
internet or data source) at the same rate. Symmetrical services are commonly used in applications requiring
high speeds in both directions, which is ideally suited for business applications. Increasingly, symmetrical
applications, which began with enterprise networks, are now also required by both small and medium
enterprises and residential customers. Leading the list of symmetrical applications are video conferencing,
interactive videos, and telecommuting.
In Asymmetrical mode, data travels downstream (from the Internet or data source) at a different rate than it
travels upstream (sending to the Internet or data source). Asymmetrical services are typically faster
downstream than upstream because they were designed for residential users who typically spend most of
their online time downloading information. Residential users typically send a relatively small file request to
the Web or video server, and then download very high volume files.
Can the Model 1068 be configured for symmetrical or asymmetrical transmission from the
field?
Yes, the Model 1068 can be configured for either symmetrical or asymmetrical transmission via dipswitch
settings. The dipswitches can be found on the underside of the 1068 standalone and on the front card
topside of the 1068RC. Please see the chart above for the various settings and corresponding achievable
distances.
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Does the Model 1068 operate in pairs?
Yes, the Model 1068 must operate in pairs. For each link, a Central Office (1068DV/CO/E) and Customer
Premise (1068DV/CP/E) unit is required. For concentrated applications, the 1068RC and 1068 standalone
can be used to operate with the VDSL Concentrator (Model 3324).
Which end of the link should the “CO” Central Office unit and “CP” Customer Premise unit
be located?
The Model 1068DV/CO/E and 1068DV/CP/E should be located according to their descriptions. The
1068DV/CO/E unit should to be placed at the Central Location and the 1068DV/CP/E should be placed at
the Remote Location due to special filtering requirements for each application.
Does the Patton Model 1068 support VLAN?
The Model 1068 will support VLAN (802.1Q) by passing the larger sized packets transparently. The Model
1068 does not have configuration commands to add a VLAN tag to a packet.
Does the Patton Model 1068 pass higher layer protocol such as TCP/IP packets?
Yes, the Model 1068 does pass higher layer protocols such as TCP/IP. The Model 1068 does not read the
TCP/IP packets, but will pass the packets on transparently.
Is the Model 1068 capable of bridging?
Yes, the Model 1068 will automatically learn, age, and filter 32 source addresses. Destination addresses of
incoming frames are compared with the Source Address in the address table and discarded if an entry
exists; otherwise, they are forwarded over the VDSL link.
Can voice and data be used simultaneously?
Yes, voice and data can be used simultaneously.
Will the POTS/ISDN port on the Model 1068DV operate without power?
The built-in POTS/ISDN Splitter is a passive element and does not require power to operate. The
POTS/ISDN port is able to provide a “life-line” telephone link provided the physical connection between the
CO and CP VDSL modems is still intact.
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Ethernet (10 or 100Base-T) Interface
What devices typically connect to the Ethernet 10/100Base-TX port?
Devices that typically connect to the Ethernet port are Ethernet Hubs/Switches, Remote PC’s, and any other
network enabled device.
How is the Ethernet port configured to accept 10 or 100Base-TX?
The Ethernet port automatically senses 10 or 100Base-TX Ethernet connections.
Does the Ethernet port require configuration for full or half-duplex connections?
The Model 1068 will automatically sense full or half-duplex Ethernet connections. To fully utilize the
100Base-TX Full-Duplex feature, your network enabled devices must support 802.3x flow control (pause
packets). A switch setting is provided on the Model 1068 to transparently lock out the 100Base-TX full
duplex communication if your network enabled devices do not support 802.3x flow control (pause packets).
This feature will only allow Ethernet connections in 10Base-T full/half duplex or 100Base-TX half duplex and
transparently avoid the 802.3x issue without degrading link performance.
Do I use straight-through or crossover cables?
The 1068 is equipped with an MDI-X switch that enables automatic connections to a hub (DCE) or PC (DTE)
interface, thereby eliminating confusion over whether a straight-through or crossover cable is needed. The
Ethernet port will automatically sense the required connection type.
Power Supply
What are the power supply options for the Model 1068’s?
The Model 1068’s come standard with an external 120VAC or UI (100-240VAC) power supply. –48, -24, or
-12VDC power supplies are optional and ordered separately.
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