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TLD2 TNET Line Driver
OverviewThe TlD2 is used to connect terminals to the TNET System. The TNET (TransTerm
Network) is an on-line real time interactive data communication system with which up to
250 remote terminals can send and receive messages to and from a central host computer.
The TLD2 functions as both a repeater and a hub on the network. Each TLD2 provides six (6)
additional ports to attach terminals to the TNET network. The TLD2 has one input port and
seven output ports. Typically, the port labeled "IN" connects to the TNET
Network Controller or to an "upstream" TLD2's "OUT" port, the ports
labeled "1" through "6" connect to individual terminals, and the port
labeled "OUT" connects to the next "downstream" TLD2's "IN"
port, although all the output ports can connect to Terminals or other TLD2s. TLD2 PortEach TLD2 port is isolated and protected from
external noise and signal disturbances. If a cable is damaged or a terminal receives a
power surge only terminals "down stream" from the disturbance are effected. Boosts Signal StrengthThe TLD2 Line Driver functions as a signal amplifier by boosting all of the received
signals. This enables cable runs of up to 2000 feet between each TLD2s and any adjacent
device on the network (unless the cable also carries power). Powering TNET TerminalsThe TLD2 can supply power to the attached terminals with some limitations. Powered
terminals cannot be more than 100 feet from the TLD2, and different terminal options can
effect a terminal's power consumption (i.e. attaching a handheld laser scanner). Alternatively,
a terminal with it's own power adapter can be up located up to 2000 feet from its TLD2. L.E.D. IndicatorsLED indicators on
the IN, OUT and the six device ports visually indicate incoming data activity at that
port. The "IN" indicator will signal that the TIM1B network controller or
upstream TLD2 is properly connected and the controller is polling. The "OUT"
L.E.D. indicates that devices further down the trunk are connected and responding
correctly. The "1" through "6" L.E.D.s indicate that the terminal
attached to that port is properly connected and responding. Power Adapter JacksThe TLD2 has two
power input jacks but is shipped with only one 1 AMP power adapter. Typically, the single
adapter will provide power for the TLD2 and up to six (6) attached devices (depending on
terminal options). If more power is required, another adapter can be connected to the
second power jack. Additional power may be required if a card reader, laser or CCD
scanner, or if some other high-powered device is attached to any of the terminals. In some
cases, each terminal may need a separate power adapter. Network ConfigurationUp to 250 TNET
terminals can be connected downstream on the TIM1B Network Controller using
"daisy-chained" TLD2s connected in a "star-node" topology. Modular PortsAll of the ports on the
TLD2 are RJ45 8-pin modular jacks. The pin-to-signal assignments for the modular jacks are
listed below. Notice that the device ports and the "OUT" port are identically
pinned, but on the "IN" port, the transmit and receive pairs are reversed. This
allows the use of straight through pintopin modular cabling on the network.
SpecificationsTNET Communications Ports (inputs & outputs)
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