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Using JBM device to connect  AS400 dumb terminals to AS400 server

Posted on 2009-02-19
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Last Modified: 2013-12-06
Hello Expert,

I have a JBM device which I want to use as a media to connect some AS400 Terminals via our tcp/ip network to an AS400 server.
Could any expert Please advice how this can be done.
Regards

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Question by:jomfra
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LVL 36

Expert Comment

by:Gary Patterson
ID: 23682558
What specific JBM device do you have that you are trying to configure?

http://www.jbmelectronics.com/product/prodsmry.htm

Their technical support page offers setup instructions for most devices, and they offer email and phone support as well.  If you have already reviewed this information, and still need help, post back with your specific device model and I can give you a hand getting it configured.

- Gary Patterson
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Author Comment

by:jomfra
ID: 23682898
hello Gary,

I new to this and would appreciate greatly you helping hand.

MODEL :- jbm gateway c 102b

regards
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LVL 36

Expert Comment

by:Gary Patterson
ID: 23683264
I was able to locate the reference manual for this unit for you.  

http://www.jbmelectronics.com//doc/manuals/20_100_200/c102_reference.pdf

What model terminals and/or controller are you trying to get hooked up?

- Gary
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LVL 36

Expert Comment

by:Gary Patterson
ID: 23683371
Unless you have some specialized hardware you need to get up and running, it is probably going to be a -lot- easier to just hoop up PC's and use client access or another Tn5250 client if you already have a TCP/IP connection to the AS/400.

- Gary Patterson
0
 

Author Comment

by:jomfra
ID: 23683488
hello Gary

The model of the terminals are 3486 and 3476.

the model of AS400 server is i5 series.

Regards
Jomo



0
 

Author Comment

by:jomfra
ID: 23684537
hello Gary,

Just a bit of background about the current enviroment.

We want to disconnect and remove the existing starr hubb and RCU at our remote site, and connect this through our existing TCPIP network via a switch and DSL link to the AS400 (main site).
0
 

Author Comment

by:jomfra
ID: 23691328
hello Gary,

Still awaiting your response.

Sorry for being so persistence.

Regards
Jomo
0
 

Author Comment

by:jomfra
ID: 23693773
hello Gary,

>> Unless you have some specialized hardware you need to get up and running, it is probably going to be a -lot- easier to just hoop up PC's and use client access or another Tn5250 client if you already have a TCP/IP connection to the AS/400.

This option is our backup plan i would prefer the having the terminals remain and use the
JBM .
Economical it is feasible to use the terminals since it would require acquiring 20
new workstations and also the officers using the dumb terminal only require enquiry access to the as400 .
Hope a solution could be found but if it prove  difficult I may have to purchase the new worlstations.

Regards


0
 
LVL 36

Expert Comment

by:Gary Patterson
ID: 23693858
Makes sense to try to use this device if the alternative means buying all new equipment.

What is the make, model and feature code of the workstation controller that you plan to use?  Does it have an interface that is compatible with the Async or Sync interface on the JBM 102?

- Gary Patterson
0
 

Author Comment

by:jomfra
ID: 23694844
Hello Gary,

>> What is the make, model and feature code of the workstation controller that you plan to use?

Is this the "RCU" if so i plan to do away with this unit and attempt to connect the

terminals to the cisco switch.

The switch is connect to a cisco router (configure for dsl communication)

this in turn is connect to dsl modem allowing  connection from this site to the

main site which house the AS 400.

Could the JBM be use for the above.

Regards
JOMO
0
 
LVL 36

Accepted Solution

by:
Gary Patterson earned 2000 total points
ID: 23696337
RCU is a common abbreviation for "Remote Control Unit".  Yeah, what is the make, model, and featurecode of that device?

Now I'm confused.

IBM 3476 and 3486 terminals are dumb twinax (http://dictionary.zdnet.com/definition/twinaxial.html) terminals.  In order to them to communicate with the AS/400, they need an intelligent device (called a "remote workstation controller", or often just "remote controller") in order to operate.  Twinax terminals are not Ethernet devices, and cannot be connected to any Ethernet switch (in fact, doing so might damage the switch, the terminal, or both).

The JBM C102 is not desinged to operate these types of devices, at least not directly.  It is designed to connect async or sync devices to a TCP/IP network.  It might be possible to connect the JBM to a sync remote workstation controller, but you'll need a twinax-compatible workstation controller (IBM 5394, for example) and assistance from the JBM's technical support (or another expert that is familir with that configuration) for this configuration.

The "normal" IBM configuration for a remote location running twinax terminals is like this:

1) IBM 3476/3486 Twinax Terminal

connected to
2) IBM Twinax cabling -OR- Twinax balun's designed to allow twinax signals to run over unshielded twisted pai (UTP) wiring.
http://www.twindata.com/technical/balun.htm

connected to
3) Remote twinax workstation controller, like an IBM 5294, 5394, or Perle 394.  
http://www.directdata.net/pdfs/perle/BR_394_US.pdf

connected to a
4) Syncronous modem at the "remote" location

connected to a
5) Dedicated communications circuit

connected to a
6) Syncronous modem at the host end

connected to the
7) AS/400 interface card.

The JBM device, assuming it is usable in this configuration, would drop into the network in place of the sync modem in "4" above:

4) JBM device
5) Ethernet - TCP/IP network
6) Ethernet - TCP/IP connected AS/400

Personally, if I were in your shoes, I'd forget the JBM device unless you can get tech support from the manufacturer for your configuration and go straight for a hybrid solution this (also google "twinax over tcp/ip"):

http://www.twindata.com/i5twinax/

These devices drop in the list at line "3":

3) eTwinax Controller
4) Ethernet / TCP/IP network
5) Ethernet / TCP/IP connected AS/400

Cheap, fast, and easy to set up.  I've used these, and they are great.  You'll still need some way to cable the terminals.  You can daisy-chain them together using twinax, or you can use a twinax-to-UTP scheme that would allow you to using existing building wiring (phone or data wiring), plus baluns at each end.  

Neither scheme is particularly cheap to implement, since twinax cable is expensive and balun's (you need a pair for each terminal) are not cheap either - but that is the price you'll have to pay if you want to reuse a bunch of old twinax terminals.

- Gary Patterson

0
 

Author Comment

by:jomfra
ID: 23724640
hello Gary,

>> The JBM device, assuming it is usable in this configuration, would drop into the network in place of the sync modem in "4" above:

This is exactly what i would like to do

Kindly  advise how to configure the JBM to such as replace sync modem.

Regards
0
 
LVL 36

Expert Comment

by:Gary Patterson
ID: 23725161
I have no idea.  I'm not sure that it is possible to use the JBM device in this fashion.  You'll probably need to work directly with their technical support staff to determine if such a configuration is even possible.  If so, they can probably provide you with configuration instructions.

You will also need a remote workstation controller to connect the terminal to the JBM device or whatever network gateway device you end up using.

Again, I recommend you explore another option.

- Gary Patterson
0
 

Author Comment

by:jomfra
ID: 23725260
hello Gary,

Thanks for all the assistance

You have been a great help and indeed i have learn how this legacy equipment
works

I will go ahead an award points and probable explore another option once again thanks
Regards


 
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