V
ERI
-
N
ET+
Link Tester
Copyright 2001. Black Box Corporation.
All rights reserved.
1000 Park Drive, Lawrence, PA 15055-1018
724-746-5500
Fax 724-746-0746
FEBRUARY 2001
TS027A-R3
CUSTOMER
SUPPORT
INFORMATION
Call our Technical Support Specialists to
discuss your application.
For 24-hour technical support:
Call
724-746-5500
or fax
724-746-0746
To order: Call 724-746-5500
7:00 AM to 8:00 PM EST
Mail Order:
Black Box Corporation
,
1000 Park Drive, Lawrence, PA 15055-1018
LINK SIGNAL TYPE
Three different signals can be used to establish a
Link: a Link Code Word, an NLP or an MLT-3 waveform.
The Link Code Word is specific in both Link speed
and duplex mode. The
NLP is specific in speed
(10Mbps) but ambiguous
in duplex mode (half or
full). The MLT-3
waveform is also specific
in speed (100Mbps) but
ambiguous in duplex
mode. Duplex modes for
equipment that use NLP or
MLT-3 signaling must be carefully managed to
ensure proper Link operation.
Example
: Most 10/100 switches when configured to
either 100Mbps full duplex or half duplex mode use the
same MLT-3 signal to setup a Link. If a switch port that is
set to 100Mbps full duplex is connected to a NIC set for
Auto-negotiating, the NIC will establish a half duplex
Link based on the MLT-3 signal from the switch. The
duplex configuration mismatch will cause the Link to
perform poorly due to high error rates and collisions.
The Veri-Net+ indicates an MLT-3 signal by
alternately blinking the 100TX and 100FD indicators. An
NLP signal is indicated by alternately blinking the 10TX
and 10FD indicators. When this condition exists, the
Link Partners must be configured as follows:
-same speed and duplex mode
-one in half duplex mode and one in Auto-
negotiation mode
-both in Auto-negotiating mode
for the Link to operate properly. Duplex mismatch is a
common network problem. For improved network
management, the Veri-Net+ warns the user when
ambiguous duplex mode Link signals are detected.
BATTERY LIFE
Auto Power Down
-
The Veri-Net+ will automatically
turn off after approximately 12 minutes of operation.
Low Battery
- When the battery is below the level
required for the Veri-Net+ to operate properly, the
“FAULT” indicator blinks on and off.
APPLICATIONS
Network Planning
- Identify capabilities of installed
equipment for LAN upgrades without opening the case.
Installation
- Verify physical layer connectivity to the far
end. Link activation signals verify two way continuity and
identify connected hub/switch port.
Trouble Calls
- Reduce troubleshooting time by
ensuring the Link is active and no faults are detected.
Locate physical layer problems with built-in tone
generator and standard tone probe.
Moves, Adds and Changes
- Identify correct wire pair
with tone generator feature and verify Link is operating
after punching down new connections.
Network Management
- Test current configuration of
installed equipment to determine if modes have been
configured manually and type of Link signaling used.
