Tekron ITR, User Manual, Page: 10 / 15

because timing is everything P a g e | 10
ITR Outputs
Typical input to Copper / Fiber output delays are 85±10nS.
Copper Loop Output
The copper loop output from the ITR is wired in parallel with the ITR's copper input. It is
therefore not electrically isolated from the copper input. Shorting the
Term connection
terminals will add a 120Ω resistor across the copper input effectively terminating the copper
line.
Fiber Output
The Fiber output signal mirrors the input from either the copper input or Fibre input signal. If
both are present at the same time, then the Fiber output signal will be the logic AND of the
two signals.
The fiber output is 62.5/125 um,
λ = 820 nm, multimode. Power is 17.5dB typical.
TTL Output
The TTL Output is a 0 to 5V Pk signal capable of driving up to 150mA loading. This output is
internally protected with a PTC resettable fuse.
RS422 /RS 485 Outputs
The RS422/RS485 output is ±5V, 50 x RS422 unit loads (RS485 Compatible).
RS 232 Output
The RS232 output is ±10V (typical unloaded) and capable of driving 15mA maximum.
MOSFET Output
The HV MOSFET option provides a 300Vdc (+0V tolerance), 100mA, high speed MOSFET,
fused with reverse polarity and ESD protection. The internal signal delay from input to HV
MOSFET output is 60uS typically.
Optional AM IRIG-B Output
The Optional AM IRIG-B output provides an Amplitude modulated IRIG-B output signal
nominally 8 V pk-pk with 120
Ω output impedance.