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If I remember correctly you can have SFP or SFP+ in the uplink modules of C3750-X but all ports must be the same type. You cannot mix.
SFP, SFP+ or QSFP are all types of transceivers used to connect a switch or other network device to copper or fibre cable. They are most commonly used to add fibre ports. Which SFP transceiver you choose depends on the cable type, application, required optical range for the network and the desired data transmission rate. What is an SFP? The GLC-BX-D and GLC-BX-U SFPs also support Digital Optical Monitoring (DOM) functions according to the industry-standard SFF-8472 Multisource Agreement (MSA). This feature gives the end user the ability to monitor real-time parameters of the SFP, such as optical output power, optical input power, temperature, laser bias current, and transceiver supply voltage. The Cisco GLC-BX40-D-I, GLC-BX40-DA-I, and GLC-BX40-U-I SFPs operate on a single strand of standard SMF. INF-8077i: 10 Gigabit Small Form Factor Pluggable Module" (PDF). Small Form Factor Committee. August 31, 2005. Archived from the original (PDF) on March 17, 2017 . Retrieved March 16, 2017.SFP ports can accommodate both copper and fiber optic cable connections. The use of a copper or fiber optic cable depends on the data transfer capabilities of the SFP transceiver. The Cisco 10GBASE-LR module supports a link length of 10 kilometers on standard Single-Mode Fiber (SMF) (G.652). SFP-10G-LR-S does not support FCoE. Again, how about the SFP+ module and SFP module interconnectivity? Does SFP+ work with SFP? Can it work in the cases where an SFP+ module plugged in a 10Gb switch connects to an SFP module plugged in another gigabit switch? It depends on the types of module and transmission link. Most fiber 10G SFP+ optics can only run at fixed 10G/s, which explains why 10G SFP+ fiber transceivers can not auto-negotiate down to 1Gbps or less to support the SFP module. However, it is feasible in two cases.
SFP transceivers are right-handed: From their perspective, they transmit on the right and receive on the left. When looking into the optical connectors, transmission comes from the left and reception is on the right. [64] This post is an SFP compatibility guide , illustrating the transceiver compatibility issue among the most popular form factors - SFP SFP+ compatibility, SFP28 SFP+ compatibility, QSFP28 QSFP+ compatibility. BX (officially BX10)–1490nm/1310nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as BX-U and BX-D for uplink and downlink respectively, also for distances up to 10km. [21] [22] Variations of bidirectional SFPs are also manufactured which use 1550nm in one direction, and higher transmit power versions with link length capabilities up to 80km. As we utilize the SFP transceivers with CWDM/DWDM Multiplexers, the network capacity will increase because CWDM SFP transceivers transmit multiple data channels over separate wavelengths on the same fiber pair.The Cisco 10GBASE-LR Module supports a link length of 10 kilometers on standard Single-Mode Fiber (SMF,G.652). The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two devices. SFP-10G-BX40D-I transmits a 1330-nm channel and receives a 1270-nm signal. The SFP-10G-BX40U-I transmits at a 1270-nm wavelength and receives a 1330-nm signal. If you've ever had to connect devices using copper or fiber optic cables, you've probably encountered an SFP port.
In recent years, [ when?] SFP transceivers have been created that will allow 2.5Gbit/s and 5Gbit/s Ethernet speeds with SFPs with 2.5GBASE-T [28] and 5GBASE-T. [29] Connecting a UDM-SE to an ISP modem on the WAN and a computer on the LAN using the UACC-CM-RJ45-MG at 2.5/5/10Gbps speeds. SFP28 Modules SFP+ and SFP28 are two different types of transceiver form factors in the small form-factor pluggable (SFP) family. While SFP+ is an upgraded version of SFP, SFP28 is an enhanced version of SFP+. Consequently, SFP28 ports in network equipment such as switches and routers will accept all SFP28, SFP+, and SFP transceivers. However, what are the main differences between SFP+ and SFP28 and what are their core features? a b c d e SFF Committee (May 12, 2001), INF-8074i Specification for SFP (Small Formfactor Pluggable) Transceiver , retrieved April 30, 2020 Switch and router manufacturers implementing QSFP+ ports in their products frequently allow for the use of a single QSFP+ port as four independent 10 Gigabit Ethernet connections, greatly increasing port density. For example, a typical 24-port QSFP+ 1U switch would be able to service 96x10GbE connections. [55] [56] [57] There also exist fanout cables to adapt a single QSFP28 port to four independent 25 Gigabit Ethernet SFP28 ports (QSFP28-to-4×SFP28) [58] as well as cables to adapt a single QSFP56 port to four independent 50 Gigabit Ethernet SFP56 ports (QSFP56-to-4×SFP56). [59] Applications [ edit ] Ethernet switch with two empty SFP slots (lower left)SFF Committee. "QSFP+ 14Gb/s 4X Pluggable Transceiver Solution (QSFP14)" (PDF). p.5 . Retrieved June 22, 2016. A SFP-10G-BX40D-I device is always connected to a SFP-10G-BX40U-I device with a single strand of standard SMF with an operating transmission range up to 40 km. SFP+ can get up to 30m using an electrical signal. The more extended reach applications come with the use of an optical signal over either multi-mode fiber, which allows up to 300m, or single-mode fiber, which allows for over 100km of transmission.
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