PTP Translator Manual / December 2014 4
3Inputs and Outputs
ETH: Ethernet Port (RJ45 connector / Dual ST Fiber)
PTP Translator units are fitted with either a RJ45 10/100 Ethernet interface or a dual ST Fiber 100FX Ethernet
interface. The unit can be configured over the LAN (Local Area Network) and can be upgraded to include a
NTP / SNTP License.
Next to the Ethernet connector are two LEDs with the “LNK” LED (green) above the “ACT” LED (yellow). The LNK
LED will be on when the unit is connected to a valid Ethernet port whilst the ACT LED will be on/flashing when there is
activity on either the transmit or receive pair.
TX: Fiber Output
The fiber output can be configured by the configuration tool to output an IRIG-B (B00x, B22x) signal, a DCF-77 signal
or user defined pulse. The fiber transmitter is compatible with 50/125 µm, 62.5/125 µm and 100/140 µm glass fiber.
TTL: TTL Output
The TTL output is a high drive, non-isolated TTL level driver which can be configured by the Configuration Tool to
output an IRIG-B (B00x, B22x) signal, a DCF-77 signal or user defined pulse.
ALM: Alarm Output
The alarm output is a high voltage isolated contact capable of switching up to 300 V at 100 mA. It is normally-closed
so that the alarmed state is the contacts open (i.e. the same as when the power is off). The alarm source is
configurable by the configuration tool.
OPT: Optional Output
The PTP Translator has a slot for one IO card to allow a variety of user interfaces.Each card is limited to one
additional port with at least 3 kV isolation from the rest of the system to avoid current loops.
The table below shows the main variants and orderable options:
TTL (5 V, 150 mA) IRIG-B (B00x, B22x), DCF-77 or user defined pulse output.
RS232 level (9 V, 10 mA) output supporting serial strings.
AM IRIG-B Analog IRIG-B (B12x) signal, typically 8 V with 3:1 mark space ratio. Output Impedance 120
Ω.
Requires a 100 – 180 Ωterminator.
Table 3 – PTP Translator Available Interface Modules
4Power Supply Options
There are three different power supply options available for the PTP Translator. Low, medium or high voltage supplies
are available as a card and feature similar maximum output ratings but different levels of isolation.
14 – 36 Vdc Maximum 5 W, 1.6 kV Isolation
20 – 75 Vdc Maximum 5 W, 1.6 kV Isolation
90 – 300 Vdc Maximum 5 W, 3.75 kV Isolation
Table 4 – PTP Translator Available Power Supplies
5Isolation & Protection
The TTL output features an earthed, non-isolated driver and is designed for connection within the same rack. Since it
is the only output with an earth reference, it is isolated from the power supply via the power supply isolation and from
all other IO by their isolation. All the other outputs are galvanically isolated (including the optional TTL output card)
from the internal electronics and power supply.
The Alarm port has a UL and VDE approved, 3.75 kV AC isolated contact and is protected by a 600 V, 175 mA
self-resetting fuse and a 350 V transient suppressor diode.
