3Com S27x, S26x, S24x installation manual Line Impedance, Transmit Clock

Configuring Channelized Data

Line Impedance

Range:		75, 120 Ω
Default:		120 Ω
Description:		Defines the line impedance as 75 Ω or 120 Ω
Transmit Clock
Range:	INT, REC
Default:	INT
Description:		Selects the source of transmit clock.
			• INT: From Internal Oscillator
			• REC: Transmit Clock is derived from Receive Clock
			Note
		Only one E1 port on the card can be selected for REC timing.

Threshold Value-LCV

Range:	1 to 255
Default:	10
Description:	Specifies the number of errors that must occur within a fixed
	15- minute window before an alarm is declared. This is based on
	the threshold value for Line Code Violations, which are the
	occurrences of either a bipolar violation or excessive zeroes error
	events.
Threshold Value-PCV
Range:	1 to 255
Default:	10
Description:	Specifies the number of errors that must occur within a fixed
	15- minute window before an alarm is declared. This is based on
	the threshold value for Path Coding Violations, which are frame
	synchronization bit errors in the D4 and E1-noCRC formats, or
	CRC errors in the ESF and E1-CRC formats.

5-14 Channelized Data