The Off position sets the Squelch level to low. When the Squelch level is set to low, the ports are able to receive weaker signals. Note that Low Squelch mode does not conform to the
On unshielded twisted pair cable, setting the Squelch level to low increases the achievable link distance by approximately 25% to 50%, but with the added risk of losing packets to impulse noise. Do not use Low Squelch mode if your network should experience too many illegally short packets (runts). This problem will occur if there is significant external noise around the link.
Setting the Squelch level to low in conjunction with shielded twisted pair wiring increases the achievable link distance without sacrificing noise immunity. Thus, there is no realdrawback in using Low Squelch on shielded twisted pair.
To gain the extended link distance achieved by using Low Squelch mode, you must use qualified data grade shielded twisted pair cable or qualified high performance unshielded cable. IBM Type 1 shielded cable (with an appropriate RJ45 to Type 1 connector), among others, meets this requirement. If you are unsure of the grade of twisted pair cable to use, set the Squelch level to high, or call 3Com for a list of qualified cables to use in extended distance applications.
Channel Select Switch Settings
The ONline Ethernet
The channel select switch settings (switches 2 and 3) on dip switch SW3 let you select a channel. Switches 2 and 3 are factory set to On, therefore, the