Network Instruments WAN Probe Kit ユーザーズマニュアル

Running Observer Software with the WAN Probe 29 

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.

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.