GarrettCom ES42 - Manual (Page 29)

ES42 Series Edge Switches Installation and User Guide (05/05)
There is a power (PWR) LED to indicate that the unit is turned ON. The fiber
ports on the ES42 Edge switches are multi-mode or single-mode with an SC, ST or small
form factor connector (MTRJ multi mode or LC single-mode).
The external DC power plug connector and/or “jack” and the internal DC input
terminal is provided on the rear of the unit.
2.3 Frame Buffering and Latency
The Magnum ES42 Series Edge Switches are store-and-forward switches. Each
frame (or packet) is loaded into the Switch’s memory and inspected before forwarding can
occur. This technique ensures that all forwarded frames are of a valid length and have the
correct CRC, i.e. they are good packets. This eliminates propagation of bad packets,
enabling all of the available bandwidth to be used for valid information.
While other switching technologies such as "cut-through" or "express" impose
minimal frame latency, they will also permit bad frames to propagate to the Ethernet
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