MX2800 STS-1 User Manual Installation and Operation, Section 2Rear Panel61204659L1-1A 2-7Modem PortThe MODEM port is an 8-pin modular jack that provides a telephone line (POTS) connection for the inter-nal V.34 modem.The MX2800 STS-1 can be configured as a dial-in host and also as a dial-out-on-Trap device (meaning theunit dials out to a specified host to report error conditions).NOTEInformation regarding the built-in modem applies to the followingADTRAN products:4204659L1 AC Non-Redundant Version with Modem4204659L2 AC Redundant Version with Modem4204659L3 DC Non-Redundant Version with Modem4204659L4 DC Redundant Version with Modem4204659L10 STS-1 AC/DC Redundant with Modem4204659L11 AC Non-Redundant with Modem with Fans4204659L12 AC Redundant with Modem with Fans4204659L13 DC Non-Redundant with Modem with Fans4204659L14 DC Redundant with Modem with FansNoncritical and Critical Alarm ConnectorsThe alarm connectors connect to the three contacts of a Form C type relay on the main board of theMX2800 STS-1. This relay is activated any time the MX2800 STS-1 detects an alarm condition on theSTS-1 network interface. Both NC (normally closed) and NO (normally open) contacts are provided.Connect alarms to one of the three-position modular terminal lug connectors (provided). These connectorsmake it easier to perform initial wiring and to connect and disconnect alarms when replacing rackmountunits. Once a modular connector is wired, push it firmly into the rear panel NONCRITICAL or CRITICALconnector.The alarm functions can be enabled or disabled through the Alarm Relays section of the Configurationmenu (refer to Alarm Relay Configuration on page 3-31).Network InterfacesThe network interfaces are full-duplex circuits provided by four BNC coaxial cable connections. Thereceive data from the network is connected to the RX (IN) connectors, while the transmit data from theMX2800 STS-1 is connected to the TX (OUT) connectors.NOTENetwork interfaces must be connected using coaxial cables that have theshields grounded at both ends.
