local dialtone issues - redundancy case study [7:58952]
This is a proposed solution for local dialtone, to replace pool of copper trunks : Main site will be equiped w/ main PBX / Voice Mail / ACD system. Coming into main site will be 3 leased T1's from each branch office. For local dialtone @ the Main office, ISDN PRI is utilized. Custom call routing is enabled. At each branch, there are currently 4 copper lines used as a pool for local dialtone. The proposed solution is replace each branches 4 copper lines w/ PRI for caller id issues in the corporation. Question to you guys: How could you enable redundancy in this scenario? Since PRI is a digital signal what happens if there is power problems at the CO? It's not like good old analog lines I would assume. Usually where I'm located, if your T1 is down, so is your PRI, it's just the nature of the beast. Anyone have suggestions? Comments? There will be 1 analog line for 911. Thanks Adam Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=58952t=58952 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: local dialtone issues - redundancy case study [7:58952]
On Wed, 11 Dec 2002, Adam Frederick wrote: How could you enable redundancy in this scenario? Since PRI is a digital signal what happens if there is power problems at the CO? It's not like good old analog lines I would assume. Usually where I'm located, if your T1 is down, so is your PRI, it's just the nature of the beast. Anyone have suggestions? Comments? There will be 1 analog line for 911. Well don't forget power issues also affects T1s that are channelized. Even though your T is analog that doesn't mean it doesn't require some non-teleco powered equipment to multiplex the lines to the T1. PRI has the same issues as T1s do. For phone equipment they both require client side powered devices to operate. Granted a T1 does provide its on power for the CPE breakout box, the equipment it untimately plugs into does require power. PRIs are the same and have the exact same issues. I've seen PRI provisioning described by many providers as running a PRI over a T1 and just configure the 24th channel to provide the D channel (23B+1D). Now what kind of redundancy are you looking for? Power issues at the CO are rare in the US since they generally have quite the battery and generator setup. Now if you are getting circuits off a SLC and not directly from the CO then you risk losing power at the teleco equipment and there is nothing you can do about that without an emergency system powering the SLC. This has the same effect on analog circuits. Regardless of if you have a PRI a T1 or a standard analog phone line then if the CO or SLC loses power you are just outta luck. Most COs never lose power because its too costly in SLAs but it is really common for a SLC to lose power. You just need to negotiate your contract and try everything you can to attempt and have the circuits ran from the CO and not a SLC without backup power. At one of my employers we have an OC-3 smartring that provides all over our PRIs for incoming dialups. Granted its overkill for only a few PRIs but we have enough to justify it. And with the smartring service it is linked to two seperate COs in two different cities. I've seen it only have to failover to the other teleco once and that was when there was a massive cable cut and they managed to cut our fiber. Our customers didn't notice anything and we only noticed the light that was lit on the alarm box. Andrew --- http://www.andrewsworld.net/ ICQ: 2895251 Cisco Certified Network Associate Learn from the mistakes of others. You won't live long enough to make all of them yourself. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=58956t=58952 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
