benefits Duplicated GS?

[TJ79]

Hi,

could anyone sum the benefits for the use of a Duplicated Group Switch.
If possible by comparing it with the current situation.
At the moment we have 1 GS with 2 magazines. Each LIM has to GJUL's, 1 GJUL goes to mag0 the other to mag1.

Now we want to switch to a duplicated GS. And because of involved cost I have to sum the benefits.

2 options,

- both GS's only 1 magazine so each LIM will only have 1 GJUL with connection towards 2 GS's

- both GS's with 2 magazine's each LIM will have 2 GJUL's with conections towards the 2 GS's

Can anybody help me with this?

 

[fouesnant]

Hi TJ79

The question of duplicated GS is a question of security and not related to cost (depending of course of how much you want to paid for security).

First of all you must be aware that with a duplicated GS, the call goes throught the 2 GSSIDE at the same time. This implies that each GJUL board has a connection toward the 2 GSSIDEs, ie you have to change your GJUL/1 (one PCM link) to GJUL/2 (2 PCM link). Each PCM link of the GJLU/2 board is going to each GSSIDE of your duplicated GS.

Now regading the traffic inter LIM: is it enought to have only one GJUL/2? You have to know if you need more than 30 simltaneous calls between your LIMs. If the answer is yes, then you need 2 GJUL/2 boards (at least), and the result is that you have 4 PCM lines for your LIM, 2 going to GSSIDE 0 and 2 going to GSSIDE 1.
Despite you have 4 PCM line, you can only have 60 simltaneous calls, ie only 2 PCM line are active while the 2 other are spare for redundancy toward your duplicated GS.

You have alos to think about the PCM lines of your GJUL/2; the PCM line should via different ways to avoid any distrubance in the path between the LIM and the duplicated GS.

Best regards

 

[TJ79]

Thanks for your reply!! It also reminded me that I forgot the change of the GJUL4/1 to GJUL4/2.