NM-1E1R2W problem in 3620

I'm seeing a funny packet loss problem on the ethernet port of an
NM-1E1R2W in a 3620. Simply doing a "copy flash tftp" with a ~14M
image misses 4-6 packets (i.e., there are 4-6 stalls and 4-6 dots
show up in the display). I know that it is a received (ACK) packet
that is being dropped each time: watching with a sniffer the first
packet sent after each stall is a data block with the same sequence
number as the last transmitted block. And of course I know that the
tftp server isn't missing the packet since I see its ACK immediately
before the stall.

Although this tftp server works fine with several other routers (2501,
4500, 4700, 806) I tried other servers with the same results. I also
tried several ways to attach the NM-1E1R2W to my ethernet, including
using its built-in 10BaseT transceiver and an external transceiver via
the AUI port. I tried the NM-1E1R2W in each slot in the 3620. I tried
installing a WIC-1T just for fun. Nothing made any difference. Duplex
is set correctly.

The Token Ring port on the NM-1E1R2W works fine, dropping no packets.
The seller was kind enough to send me another NM-1E1R2W to try. It
behaves in exactly the same way! Is there some known compatibility
issue with the 3620 and the NM-1E1R2W? Or a known problem with some
batch of NM-1E1R2Ws? I've noticed that that NM-1E1R2Ws usually sell
for less than NM-1E2Ws which makes me a little ccurious. :)

Dan Lanciani
ddl@danlan.*com
.

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