ITL - Internet Teaching Laboratory
Equipment Enclosures and External Connections and Controls

Asante AH2072 Hubs

The Asante AH2072 hubs act as multiport repeaters. These hubs do not store and forward packets, so collisions are possible between packets arriving on different ports. In effect all the ports connected to a hub are connected together as a single collision domain.

Each hub has 48 ports arranged as 6 rows of 8 ports each. The hubs accept 3 different kinds of interface boards.

single row RJ45 boards. Each such board provides a group of 8 connected ports.
double row RJ45 boards. Each such board provides 2 groups each of 8 connected ports. These boards act just like 2 single row RJ45 boards.
double row RJ45B boards. Each such board provides 1 group of 16 connected ports.

As many RJ45 boards as possible have been installed in the hubs so that each row of 8 ports can be used independently of the other rows. There are no interesting experiments to be performed in the lab that require more than 8 connected ports on a hub.

The rows of ports on the hub can be configured so they are independent of one another or connected to other rows. A grouping of rows is called a segment. There are two such segments on each hub - segment A and segment B. A row of ports can be configured into segment A, segment B, or no segment. All ports in segment A, whether on the same row or different rows, are connected. The hubs should be configured with each row in no segment.

The steps for setting the segment to which each row belongs is as follows:

Press the button at the bottom of the hub labelled "select" until the segment lights on the row of interest are flashing.
Press the button at the bottom of the hub labelled "segment select" until the lights on the row indicate the segment you want (A flashes for segment A, B flashes for segment B, both flash for no segment)
Repeat this process until every row is in the correct segment.
Press both buttons together and release them.
If any row is still not in the correct segment, repeat the process for that row.

The configuration should remain even after the hub is powered off.

Cisco 2900

The images below show a Cisco 2900 with 100BaseFX ports. The devices in the lab have 100BaseT ports instead. The non-removable ports are slot 0. The expansion slot on the left is slot 1 and the slot on the right is slot 2.

The system LED has the following displays:

Off - System is not powered up.
Green - System is operating normally.
Amber - System is receiving power but is not functioning properly.

Above each port is an LED. The meaning of the LED depends on the mode in which the display is set. The current mode is shown by the "Port mode LED" and changed using the "Mode button". The modes are:

STAT (port status)
- Off - No link.
- Solid green - Link present.
- Flashing green - Activity; port is transmitting or receiving data.
- Alternating green-amber - Link fault. Error frames can affect connectivity, and errors such as excessive collisions, CRC errors, and alignment and jabber errors are monitored for a link-fault indication.
- Solid amber - Port is not forwarding. Port was disabled by management or an address violation or blocked by Spanning-Tree Protocol.
UTL (utilization)
- Green - The LEDs display backplane utilization on a logarithmic scale. If all port status LEDs are green, the switch is using 50% or more of its total bandwidth. If the right-most LED is off, the switch is using less than 50% of its total bandwidth. If the LED to the left of the right-most LED is off, the switch isusing less than 25% of its total capacity, and so on.
FDUP(full or half duplex)
- Off - Port is operating in half duplex.
- Green - Port is operating in full duplex.
SPD (speed)
- Off - Port is operating at 10 Mbps.
- Green - Port is operating at 100 Mbps/

Cisco 4000

Cisco 7000

Cisco 7010