Juniper Networks IDP250 manual Connecting Devices That Do Not Support Auto-MDIX

Chapter 6: Connecting the IDP Traffic Interfaces to Your Network and Verifying Traffic Flow

NOTE: IDP75, IDP250, IDP800, and IDP8200 support auto-MDIX.

Connecting Devices That Do Not Support Auto-MDIX

For connections to a firewall or server, use a crossover cable.

For connections to a switch or hub, use a straight-through cable.

NOTE: Conventionally, crossover cables have an orange outer jacket. If you are not sure if your Cat 5 cable is a crossover or straight-through cable, lay the two ends side-by-side and observe the order of the wire colors. If the colors are in the same order, it is a straight-through cable; otherwise, it is a crossover cable.

Connecting Devices to Support Internal Bypass

When internal bypass activates, it physically connects the pair of traffic interfaces to each other with a crossover connection.

If the device does not support auto-MDIX, take special care to choose the right cables.

Suppose you plan to place the IDP inline between a firewall and a switch. First, take note of the correct cable choice for a direct connection between the firewall and switch. Would you use a straight-through cable or a cross-over cable?

If the two devices would be connected with a straight-through cable, then use a crossover cable between the firewall and IDP and a straight-through cable between IDP and the switch. When internal bypass activates and crosses-over the connection between the IDP traffic interface pair, the connection between the firewall and the switch will flow as if through a straight-through cable.

If the two devices would be connected with a cross-over cable, then use two straight-through cables. When internal bypass activates, this will have the result of creating one, long cross-over cable connecting the devices.

Connecting and Disconnecting Fiber Cables

The following procedures describe how to connect and remove a Gigabit Ethernet cable to and from the transceiver.

To connect a Gigabit Ethernet cable to a transceiver:

1.Hold the cable clip firmly but gently between your thumb and forefinger with your thumb on top of the clip and your finger under the clip. Do not depress the clip ejector on top of the clip.

2.Make sure the transceiver ejector under the port is not pressed in; otherwise, if you attempt to remove the cable the transceiver might come out with the cable still attached.

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