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<TITLE>RE: [j-nsp] attenuator</TITLE>
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<P><FONT SIZE=2>LOM,</FONT>
<BR><FONT SIZE=2>It depends which Passport card you have. The 3-port ATM SM card has a mean transmission power of -15 to -8 dBm, and the 2-port ATM IP SM card does -5 to 0 dBm. The cards have a max receive power equal to their max transmit power.</FONT></P>
<P><FONT SIZE=2>For the first card you should be ok with no attenuation at either end (but you might still want to make sure each card receives ~3dBm below saturation), for the second card you will need to put a 10 dB attenuator on the Passport transmit.</FONT></P>
<P><FONT SIZE=2>If you have any more questions on the Passport side please reply off-line.</FONT>
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<P><FONT SIZE=2>Regards,</FONT>
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<P><FONT SIZE=2>Aleks</FONT>
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<BR>
<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: Niels den Otter [<A HREF="mailto:otter@surfnet.nl">mailto:otter@surfnet.nl</A>] </FONT>
<BR><FONT SIZE=2>Sent: Tuesday, December 30, 2003 6:34 AM</FONT>
<BR><FONT SIZE=2>To: LOM</FONT>
<BR><FONT SIZE=2>Cc: juniper-nsp@puck.nether.net</FONT>
<BR><FONT SIZE=2>Subject: Re: [j-nsp] attenuator</FONT>
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<P><FONT SIZE=2>LOM,</FONT>
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<P><FONT SIZE=2>On Tuesday, 30 December 2003, LOM wrote:</FONT>
<BR><FONT SIZE=2>> We have a Nortel Passport 7480 with STM1 single mode ATM interfaces,</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> We will have 2 M7i Juniper in a very short time also they will have </FONT>
<BR><FONT SIZE=2>> OC3 Single Mode ATM2 interfaces,</FONT>
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<P><FONT SIZE=2>>From </FONT>
<BR><FONT SIZE=2>><A HREF="http://www.juniper.net/products/ip_infrastructure/modules/100045.html" TARGET="_blank">http://www.juniper.net/products/ip_infrastructure/modules/100045.html</A></FONT>
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<P><FONT SIZE=2>SMIR optical interface</FONT>
<BR><FONT SIZE=2> * Connector: SC duplex connector</FONT>
<BR><FONT SIZE=2> * Length: maximum distance 9.3 miles / 15 km</FONT>
<BR><FONT SIZE=2> * Wavelength: 1,260 to 1,360 nm</FONT>
<BR><FONT SIZE=2> * Average Launch Power: -15 to -8 dBm</FONT>
<BR><FONT SIZE=2> * Receiver Saturation: -8 dBm</FONT>
<BR><FONT SIZE=2> * Receiver Sensitivity: -28 dBm</FONT>
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<P><FONT SIZE=2>> We want to connect 7480 with M7i , as I didn't make a connection like </FONT>
<BR><FONT SIZE=2>> before that I want to ask if we should use attenuator</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> between two interfaces. In single mode interfaces with 1-2 meter fiber </FONT>
<BR><FONT SIZE=2>> patch do we need attenuator ?</FONT>
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<P><FONT SIZE=2>You need to find these specs for the Nortel Passport also and check if the max launch power (-8 dBm for Juniper) stays within the receiver specs of the other side (-28 / -8 dBm for Juniper).</FONT></P>
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<P><FONT SIZE=2>-- Niels</FONT>
<BR><FONT SIZE=2>_______________________________________________</FONT>
<BR><FONT SIZE=2>juniper-nsp mailing list juniper-nsp@puck.nether.net <A HREF="http://puck.nether.net/mailman/listinfo/juniper-nsp" TARGET="_blank">http://puck.nether.net/mailman/listinfo/juniper-nsp</A></FONT>
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