Connecting A Dry-Contact Relay Alarm System; Figure 5-19: Dry-Contact Terminal Block (Example); Table 5-1: Dry-Contact Relays Description - AudioCodes Mediant 1000B Hardware Installation Manual

Hardware Installation Manual

To connect the serial interface port to a computer:
1. Connect the flat connector (labeled "P3" in the figure above) to the serial port (labeled
1010) on the device's CRMX module.
2. Connect the DB-9 connector labeled "P1" (red) to the COM1 or COM2 RS-232
communication port of your computer.
Notes:
•
The RS-232 port is not intended for permanent connection.
•
The DB-9 connector labeled "P2" is used only for debugging.
5.7

Connecting a Dry-Contact Relay Alarm System

You can connect the device to an external audible or visual alarm system (e.g., bell, siren,
hooter, or light). The external alarm system connects to the device's two dry-contact relays
(I and II), each with a switch contact, on the CRMX module. When the device raises an
alarm (e.g., Ethernet link down), the device reports the alarm's severity level (Minor, Major,
or Critical) to the external alarm system, by triggering the dry contacts to open or close. The
dry contacts also signal when the device powers off.
The table below describes the operational status of the dry-contact relays.
Operation
No Power
No Alarm
Minor Severity Alarm
Major Severity Alarm
Critical Severity Alarm
If the dry-contact relay is short-circuited (for whatever reason), the device sends the SNMP
alarm, acUserInputAlarm. For more information, refer to the SNMP Reference Guide.
Cabling specifications:

Connector: (Not Supplied) Dry-contact wires mate, consisting of a four spring-cage
pluggable terminal block connector, as shown in the figure below. The connections
correspond to the four pins of the dry-contact connector on the CRMX module.
Media Gateways & SBCs

Table 5-1: Dry-Contact Relays Description

Dry-Contact I State
Normally Open (NO)
Open
Closed
Closed
Open

Figure 5-19: Dry-Contact Terminal Block (Example)

Dry-Contact II State
Normally Closed (NC)
Open
Open
Closed
Closed
57 Mediant 1000B Gateway & E-SBC
5. Cabling the Device
STATUS LED
Off
Solid Green
Solid Orange
Solid Red
Solid Red