EtherHub 1500 System
Threshold Menu
Select the Threshold command from the menu bar to define limits for the parameters monitored by the hub system. Limits can be set for the System (entire stack), Any Hub or Any Port, or a Select Hub or Select Port. Variables to monitor include frames, bytes, collisions, frame allignment errors, CRC errors or total errors. High and low watermarks may be set. While the trigger action includes warning, warning and isolate (for hubs), or warning and disable (for ports). When any threshold is exceeded, the agent will issue an alarm to the network management station based on the selected action.
To set thresholds:
1.Open the Threshold dialog box from the menu bar.
2.Select the system component (Type: System, Any Hub, Any Port, Select Hub, Select Port). If you choose Select Hub or Select Port, then choose the Hub ID or Port ID using the <F2> function key.
3.Select the variable to monitor (Variable: Frames, Bytes, Collisions, Allignments, CRCs or Total Errors). If you choose Select Hub or Select Port, then choose the variable Type using the <F2> function key.
4.Input an integer value for the low and high watermarks.
5.Select the appropriate action (Action: INACTIVE, WARNING, WARNING & ISOLATE for hubs, or WARNING & DISABLE for ports).
6.Implement your settings by pressing the <F3> function key.
Threshold Parameters - Hub/Port parameters include the following items:
Parameter | Description |
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Frame | The total number of frames. |
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Bytes | The total number of bytes. |
Collisions | Multiple packets transmitted over a medium at the same time, making them |
| unintelligible. |
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Alignments | Frame alignment errors occur when the received frame is a multiple of 8 bits. |
CRCs | This error occurs when the cyclic redundancy check for a frame is wrong. |
| (The cyclic redundancy check an |
| frame reception errors.) |
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Total Errors | The total number of collisions, frame alignment errors and CRC errors. |
Advanced Reference Guide
Event Activation - After initial event activation (crossing the high watermark), the monitored variable must reach the low watermark before another event is activated (again crossing the high watermark).
T: triggered | N: not triggered | |||||
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H | T |
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L
Notes: 1. The rate for all values is per one second. 2. Threshold entries are stored in the agent.
Troubleshooting
Refer to the Quick Installation Guide for a more detailed listing of troubleshooting procedures. However, if you have trouble making a connection via SNMP network management software, then please refer to the following section.
Network Management Access
You can access the
runs between your management site and the stack. | 1 |
Pin Assignments for Serial Port Connections
DB9 Serial Port Pin Description | 9 |
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The DB9 serial port on the back panel is used to connect the hub to a management device. The configuration program can be accessed from a PC, or from a remote location via a modem connection. You can use the management port to configure port settings (e.g., enabled or disabled), or to update device firmware. The pin assignments used to connect various device types to the hub's management port are provided in the following tables.
DB9 Port Pin Assignments
EIA | CCITT | Description | Hub's | PC DB9 | Modem | Signal |
Circuit | Signal |
| DB9 DTE | DTE | DB25 DCE | Direction |
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| Pin # | Pin # | Pin # | |
CF | 109 | DCD (Data Carrier Detected) | 1 | 1 | 8 | |
BB | 104 | RxD (Received Data) | 2 | 2 | 3 | |
BA | 103 | TxD (Transmitted Data) | 3 | 3 | 2 | |
CD | 108.2 | DTR (Data Terminal Ready) | 4 | 4 | 20 | |
AB | 102 | SG (Signal Ground) | 5 | 5 | 7 | |
CC | 107 | DSR (Data Set Ready) | 6 | 6 | 6 | |
CA | 105 | RTS | 7 | 7 | 4 | |
CB | 106 | CTS | 8 | 8 | 5 | |
CE | 125 | RI (Ring Indicator) | 9 | 9 | 22 |
10 | 11 |
