Unofficial hardware upgrades

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This page contains undocumented or unsupported information.
Use caution and common sense, as the information herein may pose a greater risk of triggering bugs, voiding warranties, or damaging equipment than other material on this site. See our disclaimer for more information.

M20 SSB

A 64MB IP2 SSB on an M20 can be upgraded to 128MB by adding a second 64MB DIMM. You can grab one from an unused SSB or buy one pretty cheaply. The specifications are:

  • 64MB (8Mx72)
  • 3.3v 168 pin
  • EDO
  • Unbuffered
  • ECC
  • 60ns, 4K refresh
  • 9 chips

DIMMs taller than 1.25 inches probably won't fit.

Source for cheap compatible DIMMs Tested and works.

M5/M10 FEB

Factory original SDRAM on M5/M10 FEB
Factory original SDRAM on M5/M10 FEB
DIMMs that are too tall won't work
DIMMs that are too tall won't work

A M5 or M10 FEB can be upgraded from 64MB to 128MB of SDRAM. There is only one DIMM socket on the board, so you must replace the DIMM entirely. The specifications are:

  • 128MB 144-pin SODIMM
  • PC100 CL2
  • ECC
  • Must be 9 chips
  • Must be very low profile

The memory module is electrically compatible with a Cisco compatible part MEM-NPE-400-128MB or MEM-MSFC2-128MB. However, the MEM-NPE-400-128MB is physically too large to fit. A third party version of the MEM-MSFC2-128MB works fine and fits correctly.

Source for cheap MEM-MSFC2-128MB compatible modules Tested and seem to work in M5/M10

It is possible to use larger modules than 128MB, for example 512MB. Tested to work is a module from SMART, partno SM572648578D9BPID0 with 512MB. However only 128MB will be recognized by JunOS.

Memory Testing

Testing the memory after upgrading is a good idea. This can be done by using the following commands:

  • start shell user root
  • vty ssb/feb
  • bringup chassis slot-state 0 diag
  • diagnostic set mode manufacturing
  • diag clear log
  • diag bchip 0 sdram

SBR(router vty)# diag bchip 0 sdram

[Waiting for completion, a:abort, p:pause]

B SDRAM (Slot 0) test

phase 1, B SDRAM (Slot 0) test: Address Test

phase 2, B SDRAM (Slot 0) test: Pattern Test

phase 3, B SDRAM (Slot 0) test: Walking 0 Test

phase 4, B SDRAM (Slot 0) test: Walking 1 Test

phase 5, B SDRAM (Slot 0) test: Mem Clear Test

B SDRAM (Slot 0) test completed, 1 pass, 0 errors

Afterwards disable diag mode:

  • diagnostic set mode bring-up
  • bringup chassis slot-state 0 on-line
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