long-reach interface connected to Intermediate-reach interface

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ciscomoderator Tue, 03/19/2002 - 10:40
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Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you, or there is no public information available at this time. If you don't get a suitable response to your post, you may wish to review our resources at the online http://www.cisco.com/go/solutions. You may also contact our product information line at 1-800-553-NETS or a Cisco Systems Engineer at your local Cisco office or reseller. To locate your local Cisco representative, visit http://www.cisco.com/warp/public/687/Directory.shtml

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

lcsaszar Fri, 03/22/2002 - 08:29
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The 7513 ATM port adapter (PA-A3-OC3SML) has -5 dBm maximum output power. The maximum permitted receive power of the 3661 ATM network module (NM-1A-OC3SMI) is -8 dBm, so directly connecting them may destroy the receiver optics. I recommend to insert an 5 dB attenuator at the Rx port of both ATM interfaces.

david.wilkinson Wed, 04/24/2002 - 02:35
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So, are we saying that assuming the signal is attenuated to match the power requirements, the two devices will interface correctly? Therefore, LR and IR devices are compatable?

lcsaszar Thu, 05/02/2002 - 23:06
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Yes, we need to take into account the maximum and minimum permitted optical power levels (power budget) at the input of the receiver. At the transmit side LR optics usually have 1550 nm laser, while IR usually has 1310 nm, though this is not a strict rule. In either case, the receive optics is wideband, so matching the wavelengts is not an isue.

n.pathak Tue, 05/07/2002 - 09:39
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Try using a 5 db pad on the Receive port of 3661 router.


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