Mailing List Archive

On Mon, Jan 20, 2003 at 12:15:48AM -0500, Phil Rosenthal wrote:
> M20/M40 FPC's have what looks to me to be 2 64MB PC100 ECC SDRam chips.
> Does anyone know what this memory is used for? Are the chips standard

Far as I know, this is the packet memory. The inbound PIC copies each
packet (divided into 64-byte cells) into the FPC memory, from which
the outbound PIC reads and transmits.

I can't speak for the type of RAM and whether off-the-shelf modules
would work. I've never had to replace any of mine.

-c

phil,

On Mon, Jan 20, 2003 at 12:15:48AM -0500, Phil Rosenthal wrote:
| Hello.
|
| M20/M40 FPC's have what looks to me to be 2 64MB PC100 ECC SDRam chips.
| Does anyone know what this memory is used for? Are the chips standard
| chips (ie if they fail, can they be replaced with off the shelf parts)?

the chips are standard chips [.needless to say that you would loose
warranty if you decide to play with it]

| Can you upgrade them to say 256MB of ram if you had a special
| application?

they memory is used for storage of packets and notifications
[pointer to packets] - the M-series routers are designed
to allow a max queue depth of 200msec which is more than enough
for core applications;

here comes my question(s):

would you need deeper queues ?
for what particular purpose ["special application"] ?

/hannes

On Mon, Jan 20, 2003 at 12:15:48AM -0500, Phil Rosenthal wrote:
> Hello.
>
> M20/M40 FPC's have what looks to me to be 2 64MB PC100 ECC SDRam chips.
> Does anyone know what this memory is used for? Are the chips standard
> chips (ie if they fail, can they be replaced with off the shelf parts)?
> Can you upgrade them to say 256MB of ram if you had a special
> application?

You could probably ask the same question about the DIMM on the SSB.

While we're asking that question, what is the maximum amount of ram you
can put into an RE-2.0? IE will they take bigger than 256MB dimms, and how
much total?

--
Richard A Steenbergen <ras@e-gerbil.net> http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)