Loop Telecom’s Dry Contact type A and Dry Contact type B plug-in cards are designed for the Loop-AM3440 series. These Dry Contact cards, which can be assigned to 2 DS0 time slots or 16 DS0 time slots, are used for (1) collecting alarm inputs from non-SNMP devices and issuing alarms via an SNMP trap, (2) sending commands to close remote contacts for relay devices, and (3) repeat a remote contact closure with a local contact closure.
The difference between Dry Contacts type A and type B is the higher voltage for type B interface card. These cards are used to detect remote contact closures activated by alarms and to provide remote contact closures to control network operation where needed.
When 2 DS0 time slots are chosen to carry the dry contact signals, 8 bits of one time slot carry the input contact status, and 8 bits of the other carry the output contact commands. When 16 DS0 time slots are chosen to carry the dry contact signals, one bit of each of 8 DS0 time slot carry the input contact status, and one bit of each of other 8 DS0 carry the output commands.
- Two Dry Contact plug-in cards are available
- Dry Contact type A card
- Dry Contact type B card
- Lighting Protection (IEC61850-3, IEEE1613)
- Dry Contact Inputs
- 8 pairs per card (2 ports per card, 4 pairs per port)
- Connector: RJ45
- Collect dry contact input signals and send alarm traps via SNMP port or inband to LoopView EMS management system
- Collect dry contact to be transferred via the E1 or fiber optic cable to a dry relay contact output
- Type A input port provides 3.3V output
- Dry Contact Outputs
- 8 pairs per card
- Connector: Screw
- Enable dry contact output signals through instructions via SNMP port
- Enable dry contact from the E1 or fiber cable to a dry relay contact output
- Support Open/Short function
Point to Point Application — Using both input and output dry contacts.
Using one DS0 for alarm input and one DS0 for alarm out put, and vice versa. When the alarm occurs, it will send an alarm trap via the SNMP port for management. Also, the dry contact inputs at the local site can be detected and transmitted to the dry contact outputs at the control site.
Point to Multi-Point Application
Using the 16 DS0 to carry the alarm input and alarm output (8 DS0 for input, 8 DS0 for output), and vice versa. When the any of the assigned alarms occurs, it will send an alarm trap via the SNMP port for management. From the central management center, all dry contact outputs can be controlled.