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- About Tom Randstrom
05-30-2019
Tom Randstrom
Member since
01-10-2007
Rising star
709
Posts
569
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111
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Cisco Designated VIPs 2011 Optical Networking
1
05-29-2019
08:01 PM
According the the transceiver data sheet, a GLC-BX40-D-I (or GLC-BX40-DA-I) device connects to a GLC-BX40-U-I device. Thus, you cannot connect use a GLC-BX40-U-I SFP on both sides of a fiber link.
... View more
Created by
Tom Randstrom
in Optical Networking
in Optical Networking
05-11-2019
02:09 PM
05-11-2019
02:09 PM
The same thing happens to me by reviewing the SFP DWDM's datasheet.: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/dwdm-transceiver-modules/product_data_sheet0900aecd80582763.html It indicates: "When shorter distances of single-mode fiber are used, it might be necessary to insert an optical attenuator in the link". Shorter than how much? For long reach optical transceivers, the transmitters optical output power is greater than the receiver's input power range. To use the DWDM transceiver you linked to, this module has a transmit output power of +4dBm (max) which the receiver's input range is -9 to -28dBm. To calculate the minimum attenuation required for this link to operate correctly: Transmit power (+4dB) minus Receiver input power (-9dBm) = Minimum link attenuation (+13dBm). Fiber loss is ~ 0.25dB/km (@1550nm). So, 13db / 0.25dB/km = 52km minimum link length. So if you are doing bench testing, it would be necessary to add a minimum of 13dB of attenuation to have the received power level to fall within the receiver's operating range (-9dBm to -28dBm). Let us know if you have additional questions.
... View more
03-19-2019
05:52 AM
OM1 and OM4 are both multi-mode fibers; OM1 has a 62.5um core and OM4 has a 50um core. What type of 10G SFP+ is installed in the switches? The SFP-10G-LRM transceiver module will operate over OM1 fiber when a mode conditioning patch cord is used on each end of the link. This mode conditioning cable may be the fiber you are seeing coming off the 10G SFP.
... View more
03-19-2019
05:31 AM
Yes, the GLC-SX-MMD is compatible with WS-X4724-SFP-E and WS-X4748-SFP-E. Cisco has a great tool for checking the compatibility of transceiver modules to Cisco equipment. It can be found at the following URL: https://tmgmatrix.cisco.com/home
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03-02-2019
06:41 PM
Have you tested the fiber optic link to characterize the total insertion loss? 120 km is a long fiber link which has many fiber splices, splice closures, and fiber bends that can introduce unwanted signal loss.
... View more
Created by
Tom Randstrom
in Optical Networking
in Optical Networking
11-17-2018
08:14 AM
11-17-2018
08:14 AM
The compatibility information link you provided indicates a sw rel of 16.4.1 for 4132 series.
... View more
08-26-2018
11:03 AM
The transceiver's max transmit power is 0.5dBm and the maximum receive power is 0.5dBm, so the minimum fiber length can be as short as required.
... View more
Created by
Tom Randstrom
in Optical Networking
in Optical Networking
04-25-2018
05:30 AM
04-25-2018
05:30 AM
The 1000BASE-LX/LH optics will operate properly in a back-to-back installation (no damage). But, the cost for the optic modules will be higher vs using a 1000BASE-SX modules.
... View more
Created by
Tom Randstrom
in Optical Networking
in Optical Networking
02-03-2018
04:05 PM
02-03-2018
04:05 PM
I was assuming 2 switches. I guess I am not understanding what you a trying to accomplish. It might be better for you to provide a little more information on the network you are trying to build and its application.
... View more
Created by
Tom Randstrom
in Optical Networking
in Optical Networking
02-03-2018
09:28 AM
02-03-2018
09:28 AM
Any standard Ethernet switch that supports an 1000BASE-LX/LH optical interface (SFP or fixed optics) will allow you to accomplish your networking needs.
Ethernet (copper) ==> 2960 w/ GLC-LH-SM (1000BASE-LX/LH) ==> Single Mode Fiber ==> 2960 w/ GLC-LH-SM (1000BASE-LX/LH) ==> Ethernet (copper)
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10-06-2017
06:41 PM
The below link provides a good overview of the implications of mixing fiber sizes (62.5um and 50um).
http://www.thefoa.org/tech/fib62-50.htm
... View more
Created by
Tom Randstrom
in Optical Networking
in Optical Networking
08-31-2017
07:02 PM
08-31-2017
07:02 PM
Some 3750 network modules are compatible with a 100Mbps SFP (such as GLC-GE-100FX) designed to be installed in a Gigabit SFP port. The link below provides switch compatibility information for the 100Mbps optical transceivers to switch modules. https://www.cisco.com/c/en/us/td/docs/interfaces_modules/transceiver_modules/compatibility/matrix/100MB_Tx_Matrix.html#_Toc473122774 A 1Gbps SFP cannot be directly connected to a 100Mbps SFP. Both ends of the link need to be either 100Mbps or 1Gbps. AT&T may rate-limit a 1Gbps interface to 100Mbps, which would require a 1Gbps transceiver at both ends of the link. I hope this helps!
... View more
08-17-2017
10:24 AM
Is this operating over multimode or singlemode fiber? Do you know what transceiver is on the other end of the fiber link? The 1000Base-LX transceiver's transmit specification is -3 to -9.5; so if you are receiving -1.6dBm, the transceiver at the far end probably isn't a 1000Base-LX module (or operating out of specification).
chrihussey provided one source for attenuators. make sure to match the fiber type.
... View more
08-11-2017
05:20 AM
According to the EoL Product Bulletin, "There is no replacement available for the Cisco ME 4600 Series Multiservice Optical Access Platform GPON Components at this time."
I would suggest reviewing some other GPON vendor's products.
... View more
07-27-2017
07:03 PM
10G optical transceivers do not negotiate to 1G speeds. Please provide additional details regarding the optical transceivers being utilized on each end of the link. I suspect there are higher layer issues causing the reduced through-put.
... View more
4 weeks ago
According the the transceiver data sheet, a GLC-BX40-D-I (or
GLC-BX40-DA-I) device connects to a GLC...
05-11-2019 02:09 PM
The same thing happens to me by reviewing the SFP DWDM's
datasheet.:https://www.cisco.com/c/en/us/pr...
03-19-2019 05:52 AM
OM1 and OM4 are both multi-mode fibers; OM1 has a 62.5um core and OM4
has a 50um core. What type of ...
03-19-2019 05:31 AM
Yes, the GLC-SX-MMD is compatible with WS-X4724-SFP-E and
WS-X4748-SFP-E. Cisco has a great tool for...
03-02-2019 06:41 PM
Have you tested the fiber optic link to characterize the total insertion
loss? 120 km is a long fibe...
Created by
Tom Randstrom
in Optical Networking
11-17-2018 08:14 AM
11-17-2018 08:14 AM
The compatibility information link you provided indicates a sw rel of
16.4.1 for 4132 series.
08-26-2018 11:03 AM
The transceiver's max transmit power is 0.5dBm and the maximum receive
power is 0.5dBm, so the minim...
Created by
Tom Randstrom
in Optical Networking
04-25-2018 05:30 AM
04-25-2018 05:30 AM
The 1000BASE-LX/LH optics will operate properly in a back-to-back
installation (no damage). But, the...
Created by
Tom Randstrom
in Optical Networking
02-03-2018 04:05 PM
02-03-2018 04:05 PM
I was assuming 2 switches. I guess I am not understanding what you a
trying to accomplish. It might ...
Created by
Tom Randstrom
in Optical Networking
02-03-2018 09:28 AM
02-03-2018 09:28 AM
Any standard Ethernet switch that supports an 1000BASE-LX/LH optical
interface (SFP or fixed optics)...
10-06-2017 06:41 PM
The below link provides a good overview of the implications of mixing
fiber sizes (62.5um and 50um)....
Created by
Tom Randstrom
in Optical Networking
08-31-2017 07:02 PM
08-31-2017 07:02 PM
Some 3750 network modules are compatible with a 100Mbps SFP (such as
GLC-GE-100FX) designed to be in...
08-17-2017 10:24 AM
Is this operating over multimode or singlemode fiber? Do you know what
transceiver is on the other e...
08-11-2017 05:20 AM
According to the EoL Product Bulletin, "There is no replacement
available for the Cisco ME 4600 Seri...
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| Date Registered | 01-10-2007 03:37 PM |
| Date Last Visited | 05-30-2019 12:44 AM |
| Total Messages Posted | 709 |
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Helpful Votes From
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Awards
Cisco Designated VIPs
2011 Optical Networking
