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Re: DATACENTER: Serial console concentrator/server



You can put a resistor between two pins to prevent the server from halting
when a cisco or livingston portmaster (and some others) reboots:


===
Sun
===

Used to connect Sun devices to a portmaster.  Should also keep older
Suns from dropping to the monitor prompt when booting the portmaster
or attaching the connector.

DB25 Male               RJ45
---------               ----

2  -------------------  3

3  ----------------|
                    |--  6
25 ----------------|
    Via 4.7k resistor

4  -------------------  1

5  -------------------  8

6  --|
      |----------------  7
8  --|
                    |--  4
7  ----------------|
                    |--  5

20 -------------------  2


Grisha

On Sun, 7 Nov 1999, Rob Walker wrote:

> 
> >>>>> On Sat, 6 Nov 1999 22:25:28 -0500, Jeff Wasilko <[email protected]>
> >>>>> said:
> 
> Jeff> On Sat, Nov 06, 1999 at 07:03:57PM -0800, Joseph Chin wrote:
> >> What do you think is the "best" solution for aggregrating access to
> >> serial consoles of 10-25 Sun/UNIX servers? Majority of my servers
> >> are Sun E250/E450/Netra T1, but there are a few Intel
> >> (LB440GX-based gray boxes) and Compaq that support console redirect
> >> to serial port.
> 
> Jeff> I really like the Bay/Annex terminal servers.
> 
> Jeff> The Cisco servers have a bad habit of sending what looks like a
> Jeff> 'break' signal if you power cycle the terminal server (which
> Jeff> does bad things to your sun boxes).
> 
> IIRC, that break is defined by at least a half a second of no signal
> on all the pins.  When you power cycle the 2509/11, the suns see that
> as a break.  if you power cycle other vendors' products, what happens?
> if they don't look like a break, why not?
> 
> rob
>