Network Instruments WAN Probe Kit - Manual (Page 35)

Running Observer Software with the WAN Probe 29
Serial T1/E1 Probe Settings
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
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
checkboxes Choose the channels you want to be included in the analysis.
Include in Util.
Thermometer. Check if you want to include statistics from this link in the
Bandwidth Utilization Thermometer.
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.
Setting Explanation