Network Instruments WAN Probe Kit Operating Observer Passively, Serial T1/E1 Probe Settings, •Collision Test, •Traffic Generation

Setting	Explanation
Subprotocol	If ATM or LAPB is the selected encapsulation method, you must
	choose the subprotocols on the link.
	ATM subprotocol choices are NLPID and SNAP multi-protocol;
	LAPB subprotocol choices are IP and Ethertype multi-protocol

Link 1 and Link 2 Channel Settings (Note that for the link and settings to be activated, you must check the “On” checkbox for that link).

Fractionalized	Check if this link is configured for fractionalized operation.
Channel selector	Choose the channels you want to be included in the analysis.
checkboxes
Include in Util.	Check if you want to include statistics from this link in the
Thermometer.	Bandwidth Utilization Thermometer.
Serial T1/E1 Probe Settings
Setting	Explanation
WANFrame Relay Type	Choose T1 or E1 to match the type of link you are analyzing.
Encapsulation	You must set this to match the settings on the frame relay router.
	The encapsulation options are:
	-ATM-DXI - ATM Data Exchange
	-Frame Relay - Cisco
	-Frame Relay - IETF Standard
	-HDLC - Cisco Proprietary
	-LAPB (modulo-128)
	-LAPB (modulo-8)
	-PPP - Point-to-Point Protocol
	-X.25 over LAPB (modulo-128)
	-X.25 over LAPB (modulo-8)
Fractionalized	Check if your link is configured for fractionalized operation.
Bandwidth	Set to match the bandwidth setting of the link you are analyzing.

Operating Observer Passively

When analyzing a WAN link via the Observer Probe, Observer runs “passively.” Passive operation guarantees that analysis will not affect the WAN link; however, it does have some implications when running Observer. Because there is no link over which the Probe system can transmit frames on the link, the following features are unavailable:

•Traffic Generation•Collision Test

Running Observer Software with the WAN Probe 29