Table 1-3 lists the connectors on both front and rear modules with details about their uses:
Table 1-3 Port
NCC 2020 Connector Ports Located
Management Port In
Connect an external alarm system which will trigger on either a relay closure (using NO and COM leads) or an open (using NC and COM leads). The relay in the NCC module supports Form C relay specifications.
Connect ASCII terminal for configuration, diagnostics, alarm monitoring, and/or performance monitoring.
Monitor network signals, DSX-1 equipment signals, connect T1 test equipment. These ports do not reflect line signals unless the module is in CSU mode. Use only when in CSU mode (DIU bus = none).
Connect the T1 line to this port.
Connect customer equipment which presents a DSX-1 T1 framed signal — often a PBX. This port is only used if the module is in CSU mode or Drop and Insert mode.
Connect a cable directly or a modem for dialup connection to a PC running either of the Verilink management programs — AM2000 or Node Manager.
Connect a cable to an additional node at the same location. This feature is only supported when AM2000 is used for node management.
Connect an optional external clock source, using either a TTL (Transistor Transistor Logic) level (0 to +5V) or balanced (RS-422) signal. The clock must be at 1.544 Mbit/s.
Verilink NCC 2020 User Manual