21
GIGASYNC MANUAL
VER. 3 REV. 1
IMPORTANT NOTES:
Cartridges can be inserted and removed from the base unit even if the system is powered on and running (hot-
swap). It is preferable to connect the devices to be powered after inserting the cartridge to ensure correct
calibration of the current readings.
The negative poles of each pair of cartridge connectors are directly connected. The reverse polarity protection
does not protect the device if the two negative poles are connected to voltages not suitable for being short-
circuited together.
In the case of two different power supplies (for example, 48V and 24V), the cartridge will power the output devices
with the highest active voltage. It is not possible to choose through software what voltage to power the devices
with, in this case.
Special case -48V
If -48V voltage is available (as is often the case in some telecom systems), you only need to essentially connect the 0V wire
to the positive (+) terminal and the -48V to the negative (-) terminal according to the indications of silkscreen GigaSync.
Output power
Power can be supplied in two ways through GigaSync: through the PoE injectors or the bipolar terminals.
On the one hand, in the case of PoE injectors, there are two types of cartridges that we can choose to add to our GigaSync,
with or without a synchronization pulse:
Gigabit Injector PoE: GS-G-POE
Gigabit Injector PoE with synchronization: GS-G-POE-CS
In the case of the terminal cartridges, we have the possibility of:
Power supply via bipolar terminals: GS-G-TER
Power supply via 4 poles with synchronization: GS-G-TER-CS
Protections
Double phase protection
Double-phase protection is a circuit protection technology for high-voltage environments. Both technologies combined
offer us great advantages to protect each port from voltage spikes.
The GigaSync has dual phase protection in each output port on each cartridge, both on the PoE and the terminal ports.
The technologies involved in this protection are the Transient Voltage Suppressor (TVS) and the Gas Discharge Tube (GDT).
GDT protection is also present in the main power supply of the base unit.
These protections work as follows:
GDTs are an arrangement of electrodes within a gas that works by ionizing the gas when sufficient voltage is applied. GDTs
prevent transient overvoltage damage by acting as a "crowbar" or by approximating a short to divert peak energy, typically
to the ground. This component protects the circuit without inhibiting its behavior.
When a voltage disturbance reaches the GDT turn-on value, the GDT (faster slew rate, shorter GDT turn-on time) is
activated and the voltage is reduced to the GDT arc voltage (close to 10V). Then, it will switch to a virtual short circuit, also
called the "arc condition". In this situation the GDT practically short-circuits the line, deflecting the overcurrent through the
GDT to the ground and removing the overvoltage from the equipment.
The GDT will roll back or reset to a high impedance state when there is not enough power to keep the device in arcing
condition.
At normal operating voltages below the rated DC discharge voltage of the GDT measured at a rate of rising between 100
and 2000 V / s, the GDT remains in a high impedance deactivated condition. So, for better protection, we integrate the
solution with TVS:
TVS are solid state devices that use a diode to deflect peak energy preventing damage from transient events by acting as
a "voltage clamp".
Содержание GigaSync
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