Cabletron Systems F3 user manual Distance and Cable Type, Signal Quality Error SQE Test

CHAPTER 1: INTRODUCTION

A fiber optic cable is connected to the transceiver through ST fiber optic ports on the FOT-F3. This provides an optical link to connect the device to the network.

1.3.2Distance and Cable Type

The FOT-F3 supports single mode fiber optic cable for sizes such as 8.3/125 ∝m, 8.7/125 ∝m, 9/125 ∝m, and 10/125 ∝m. You can also use multimode cable such as 62.5/125 ∝m, but the signal distance will be much shorter.

The signal distance is dependent on the cable type and the overall system fiber optic budget. If the system budgets and timing constraints are met, then a distance of over five kilometers is possible with single mode cable. However, Cabletron Systems only supports a distance of 5 kilometers. If using 62.5/125 multimode cable, signal distance is about 2 km.

An AUI cable, up to 50 meters long, is used to connect an Ethernet device to the AUI port on the transceiver. The AUI cable must meet specifications for either IEEE 802.3 or Ethernet Version 1 or Version 2.

Signal Quality Error (SQE) Test

The FOT-F3 has a Signal Quality Error (SQE) Test Enable Switch that allows the enabling or disabling of the SQE (“heartbeat”) test function. The SQE test enables the FOT-F3 transceiver to generate a signal to ensure that the collision circuit and path are operational between the FOT-F3 and the Ethernet device attached to the AUI port of the transceiver.

1-4 FOT-F3 USER’S MANUAL