Re: [Critical] GBIC over MMF...
Gary, Check out http://www.canoga.com/fast_lan.htm model 9120. HTH's Joe At 07:04 PM 3/22/01, ±è±ÔÇü wrote: Hi~ Everyone... I have some questions for GBIC. I'm gonna install the Cat 4003 connected to remote distribution switch over MMF. But distance is the problem. Distance between Cat 4003 and Cat 2948G-L3 is about over 600m using MMF. I know that distance limitation of MMF is 500m and so I need the solution to overcome this. Do you know about "extender" or "repeater" which I can apply? Thanks,. Gary KIM in Korea... _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: [Critical] GBIC over MMF...
Well, the 500m limitation is not necessarily true, but there may be other issues involved. Here's what I do in this situation: Typically, you would use SX GBICs with MMF. The transmitter on an SX GBIC is an LED, which can energize all of the modes within the MMF, whereas the transmitter in an LX GBIC is a laser, which is typically only used on SMF. This works as the laser is concentrated as compared to the spread-out nature of the LED. Single-mode pairs with a single (laser) "wave" of light and multi-mode pairs with distributed (LED) light "waves". As a result of this division of technology, the LX (also called a long-haul) GBIC can transmit data over a much greater distance than an SX version. Now to the issue: Despite popular belief, you can use MMF with LX GBICs. The catch is that you must use a special cable to connect the MMF to the LX GBIC. This special patch cable is called a "conditioning cable". This cable basically uses a SMF strand on the transmit side and an MMF strand on the receive side, and will distribute the laser transmit evenly over the mulitiple modes of the MMF. The end result is a much greater transmission distance over MMF. Cisco claims that you can directly plug MMF into an LX GBIC, but I have not had any success doing so without the conditioning cables. Cisco does sell this cable, but only with a single connector configuration. If you need different connectors, nearly all of the fiber optic cable vendors can supply these. Be warned - these cables are expensive, but when compared to replacing all of your fiber with SMF, the cost is negligible. Here's a URL describing the cables and why you need them. http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/cnfg_nts/etherne t/5421_01.htm Rik ""±è±ÔÇü"" [EMAIL PROTECTED] wrote in message news:99e7k4$hj6$[EMAIL PROTECTED]... Hi~ Everyone... I have some questions for GBIC. I'm gonna install the Cat 4003 connected to remote distribution switch over MMF. But distance is the problem. Distance between Cat 4003 and Cat 2948G-L3 is about over 600m using MMF. I know that distance limitation of MMF is 500m and so I need the solution to overcome this. Do you know about "extender" or "repeater" which I can apply? Thanks,. Gary KIM in Korea... _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: [Critical] GBIC over MMF...
I find it interesting that you haven't had luck with MMF and LX GBICs. We've had no trouble with them here, and we've deployed them in multiple areas using 6509's. Jeff Jeff Groman IS Department, Childrens Hospital, Denver [EMAIL PROTECTED] 303 864 5671 Well, the 500m limitation is not necessarily true, but there may be other issues involved. Here's what I do in this situation: Typically, you would use SX GBICs with MMF. The transmitter on an SX GBIC is an LED, which can energize all of the modes within the MMF, whereas the transmitter in an LX GBIC is a laser, which is typically only used on SMF. This works as the laser is concentrated as compared to the spread-out nature of the LED. Single-mode pairs with a single (laser) "wave" of light and multi-mode pairs with distributed (LED) light "waves". As a result of this division of technology, the LX (also called a long-haul) GBIC can transmit data over a much greater distance than an SX version. Now to the issue: Despite popular belief, you can use MMF with LX GBICs. The catch is that you must use a special cable to connect the MMF to the LX GBIC. This special patch cable is called a "conditioning cable". This cable basically uses a SMF strand on the transmit side and an MMF strand on the receive side, and will distribute the laser transmit evenly over the mulitiple modes of the MMF. The end result is a much greater transmission distance over MMF. Cisco claims that you can directly plug MMF into an LX GBIC, but I have not had any success doing so without the conditioning cables. Cisco does sell this cable, but only with a single connector configuration. If you need different connectors, nearly all of the fiber optic cable vendors can supply these. Be warned - these cables are expensive, but when compared to replacing all of your fiber with SMF, the cost is negligible. Here's a URL describing the cables and why you need them. http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/cnfg_nts/etherne t/5421_01.htm Rik ""?e?OCu"" [EMAIL PROTECTED] wrote in message news:99e7k4$hj6$[EMAIL PROTECTED]... Hi~ Everyone... I have some questions for GBIC. I'm gonna install the Cat 4003 connected to remote distribution switch over MMF. But distance is the problem. Distance between Cat 4003 and Cat 2948G-L3 is about over 600m using MMF. I know that distance limitation of MMF is 500m and so I need the solution to overcome this. Do you know about "extender" or "repeater" which I can apply? Thanks,. Gary KIM in Korea... _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
