IMC Networks IE-IMCV-T1-MUX/4 - Manual (Page 9)

5
1+1 Protection on the Fiber Interface mode
The fiber transport is a 1+1 protection switched transport. It provides very fast (<50
mSec) switch-to-protect timing by transmitting the same information on both fibers at
the same time. The fiber receiver then chooses the fiber to receive based on the
validity of the line. Once the selection is made, the receiver will stay on that fiber line
until it enters a fiber defect state at which time another fiber selection process is
started (non-revertive switching). Once a switch-to-protect has occurred, a hold off
time (1 second minimum) is used to prevent another switch-to-protect from occurring
too soon after a protection switch.
If protection is not enabled, SFP port A will be used by default and no alarm or defect
information will be provided for SFP port B. The LEDs associated with the backup
fiber line will only be active if protection is enabled.
When protection is enabled, error reporting for the backup fiber line is limited to the
Signal LOS condition. Signal LOS will generate an SFP Down trap.
A Remote Alarm Indication (RAI-F) signal is sent back to the fiber if the received fiber
is in BER or LOS defect condition. In this way the far end unit is alerted of a fault
condition on the local fiber line.
Serial Port Connection
T1 RJ-48
Connectors
10/100BaseT
Connector
RS-232
Connector
SFP
Ports
Console
The IE-iMcV-T1-Mux/4 + Ethernet includes a console serial port. To establish a link
between a module's console port and a local PC, connect the Mini Jack to DB9
adapter (optional accessory available through IMC Networks, part number
825-39950). This RS-232 serial connection provides access to the IE-iMcV-T1-Mux/4
+ Ethernet module CLI configuration screens. Set the computer/terminal for VT-100
emulation
, 38.4K baud, 8 data bits, 1 stop bit, no parity and no flow control.
Under the VT-100 emulation, set the backspace key to send delete.