IMC Networks IE-IMCV-T1-MUX/4 - Manual (Page 5)

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About the IE-iMcV-T1-Mux/4 + Ethernet
Overview
The IE-iMcV-T1-Mux/4 + Ethernet is a media converter that transports four
independent T1 lines over an existing single (or dual, “1+1”) standard fiber optic line
operating at an effective rate of 155Mbps. One serial link (RS-232) and one Ethernet
(10/100BaseT) connection are also multiplexed onto the fiber link(s). Each of these
communication channels is transported end-to-end at full wire speed with very low
latency. A maximum packet size of up to 1916 bytes is supported on the Ethernet
port.
The serial link can be used for extending an independent RS-232 interface to the
remote POP location for use in managing or controlling other devices at the POP and
supports any data rate up to 120Kbps. In addition, each unit also supports an RS-232
console port for local configuration by technical support personnel. The console port
is used for end-to-end system management, fault detection/isolation and system
diagnostics.
The IE-iMcV-T1-Mux/4 + Ethernet provides fault indications on the T1 and fiber links
resulting from real-time active faults. The equipment detects both T1 and fiber LOS
events as well as degraded T1 or fiber lines. The unit will automatically forward AIS
signaling to the remote unit after detecting an LOS (Loss Of Signal) condition on any
incoming T1 line. Severe receive optical link failures will result in the automatic
generation of AIS signaling onto the T1 lines connected to the unit receiving the
corrupted optical signal.
In addition, Code Violation (CV) errors are detected on all incoming T1 lines and BER
calculations for the optical line are constantly being performed by circuitry within the
unit's optical receiver. Error conditions are displayed on the unit’s front panel LED
indicators and reported to system management software (if equipped) where more
detailed error information can be displayed on the user’s Graphical User Interface
(GUI).
Modules equipped with 1+1 fiber redundancy can benefit from the enhanced
reliability of a protected fiber link and the system’s ability to automatically switch to
the “best” fiber line should one line become impaired or fail. This automatic
switchover capability is designed to occur rapidly (<50 milliseconds), minimizing data
loss and system down time. In addition, automatic switchover can be overridden;
this allows the end-user to force the unit to receive on a specific optical line if desired
to support periodic maintenance.