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Connection using GLC-BX

Matthew Loggan
Level 1
Level 1

Hi,

I would like to know if the following connection is correct for communicate two site using a SMF (Single Strand):

Catalyst 3850 -> GLC-BX-D ----> Single Strand of SMF <---- GLC-BX-U-> Catalyst 3850

One GLC-BX-D in one side of the link and one GLC-BX-U in the other side? that is correct?

I already have checked the compatibility of both transceivers with the C3850-NM-4-1G

Best Regards.

3 Replies 3

fiberstorejames
Level 1
Level 1

To tell the truth, GLC-BX-D and GLC-BX-U transceivers both work with single-mode fiber but they operate at different wavelength, so it might cause error. The above links are  for your reference ! 

Tom Randstrom
VIP Alumni
VIP Alumni

Below is taken from the Cisco SFP Modules for Gigabit Ethernet Applications Data Sheet:

1000BASE-BX10-D and 1000BASE-BX10-U SFP for Single-Fiber Bidirectional Applications

The 1000BASE-BX-D and 1000BASE-BX-U SFPs, compatible with the IEEE 802.3ah 1000BASE-BX10-D and 1000BASE-BX10-U standards, operate on a single strand of standard SMF.

A 1000BASE-BX10-D device is always connected to a 1000BASE-BX10-U device with a single strand of standard SMF with an operating transmission range up to 10 km.

The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two devices as depicted in Figure 2: 1000BASE-BX10-D transmits a 1490-nm channel and receives a 1310-nm signal, whereas 1000BASE-BX10-U transmits at a 1310-nm wavelength and receives a 1490-nm signal. As shown, the presence of a wavelength-division multiplexing (WDM) splitter integrated into the SFP to split the 1310-nm and 1490-nm light paths.

Figure 4.      Bidirectional Transmission of a Single Strand of SMF

C78-366584-06_Figure04

DPAR
Level 1
Level 1

Your connection is absolutely correct!

 

You required the different tx/rx transmissions provided by your "D" and "U" SPFs in order to properly communicate across a single fiber.  A very common mistake is to use the same type of SFP on a single (BiDi - BiDirectional) fiber.

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