Misfortune aside, it should be attached to the outside of the device. However, an IP address, which is mutable, is a far more convenient way of addressing a device. If you have a Mini EN/SC, you have a fixed SCSI ID=6 built into the device, in the same way as the Desktop EN/SC, so no other SCSI (such as the HDD) device may also use ID=6. The considerably larger Asanté EN/SC adapters with Thick/Thin/UTP have SCSI ID selector switches 0-7. I use both desktop kinds for my Classic and Classic II Macs (as expansion-challenged machines), with no difficulties of recognition between them and a (Netgear) 10Base-T hub, which is in turn downstream from a 10/100Base-T switch.

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I think the absence of a 10/100/and/or1000Base-T switch may be causing the issue, as Leographix already stated. I have removed the HD40 from the SCSI Chain.

Mini EN/SC 10T Termination may be turned on or off. It is ambiguous. The back side of the EN/SC has a hole with 2 dip switches. Link integrity is turned to on (the white dip switch points towards the SCSI end of the box). Integrity is indicated by the word "on" enscribed on the box. Termination (without any other devices in the SCSI chain: as recommended) points also towards the SCSI side of the box.

Now here's the confusion. On the cover this can be interpreted as "on" (The Termination LED is also lit). However, when one looks inside at the dip switch, the dip switch is pointed away from an "ON" inscribed in white.

What activity do the LEDs of the EN/SC show? Apart from a steady PWR LED, the LI (Link) LED should stabilize also if there is a successful handshake.

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The lights on the topside of the box indicate the following:

Power: Lit (on);

Network Activity: Flashes (activity) when the Powerbook 145 (192.168.1.100) pings the airport extreme router gateway address (192.168.1.1) (as an aside my Linksys "ew5hub" shows link and Act/Rx activity on both the port and uplink. a collision occurs when ping is initiated from the PB145... conversely when 192.168.1.200, my MBPro tries to ping 192.168.1.100, the PB145, there is link ad Act/Rx activity to the uplink side of the Hub, but no Act/Rx activity to the port connected to the cable connecting to the EN/SC);

Link Integrity: Lit (on);

Link Disable: Blank (off);

SCSI Termination: Lit (on?).

Remember, you have multiplied your peril by mixing SCSI voodoo with ethernet voodoo. If you daisy-chain the external HDD and the EN/SC, you will have difficulty in having the adapter recognized if the HDD also retains its SCSI termination.

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I'll save this configuration for when I'm trying to get the plus up and running over MacTCP....

The EN/SC has non-removable termination, and therefore must be the physically last device in the external daisy-chain.

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I thought I've seen several examples with a pass through cable for the Mini EN/SC 10T? Don't the Dip Switches control termination?

There is the further complication that early PBs lacked SCSI termination at the host-controller end, and sanity is often restored to the user only when a passthrough terminator is connected to the PB before any SCSI devices. The Mini EN/SC probably has this termination built into its connector specially. How then are you connecting the HDD to the EN/SC, which comes with the necessary HDI-30 connection inbuilt?

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Lets save this question for my Plus...

Try your ethernet connection with only the EN/SC attached to the PB.

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Done

That way you can establish that an ethernet connection is possible,

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Still, no dice. I likely still need the switch between the Airport Extreme and my ew5hub.

and even then you may run into trouble with the inbuilt (both sides) termination of the Mini EN/SC if you attempt again to daisy-chain the HDD to the EN/SC.

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Will try not to do that... until for the plus.

Next Question...

Should the MacTCP Gateway address be "192.168.1.1" or the address allocated by my ISP (eg. 96.64.x.x)?

K