What is the Difference between 1G and 10G SFP+?

A 1G SFP module, also known as a 1 Gigabit Small Form-factor Pluggable (SFP), is a transceiver used in telecommunications and data communications applications. It is designed to support communication over optical fiber or sometimes copper network cables at speeds of up to 1 Gigabit per second (Gbps).

There are many types of 1G SFP optical modules, primarily single-mode and multi-mode. Single-mode modules are suitable for long-distance transmission, while multi-mode modules are suitable for shorter distances. Different brands and models of 1G SFP modules also vary in terms of maximum supported distance, wavelength, and interface type, requiring selection based on specific needs.

A 10G SFP module, also known as a 10Gb Small Form-factor Pluggable (SFP) transceiver, is an upgraded version of the standard SFP module, supporting data rates of up to 10 Gb/s. It typically consists of components such as a housing, an interface, an optical transceiver, and a circuit board. It connects to the SFP+ slot of network devices such as switches or routers to transmit data between multimode and single-mode optical fibers. Compared to 1G modules, it is designed to handle greater bandwidth and is ideal for high-speed data transmission applications.

1.1 Physical Identification

One of the primary ways to distinguish between 1G and 10G SFP modules is through physical identification. Manufacturers typically place clear markings on SFP modules to indicate their speed compatibility, such as "1G" or "10G." These labels are typically located on the front or top of the module, allowing for quick identification of the speed class.

1.2 Configuration Verification

Another method is to check the configuration settings of the SFP module in the network device. Network administrators can access the device's management interface and view the configured speed of the SFP port. This method provides direct information about the operating speed of the SFP module.

1.3 Optical Power Testing

Optical power testing is a practical method for distinguishing between 1G and 10G SFP modules. By measuring the optical power output of the SFP module using a power meter or optical time domain reflectometer (OTDR), technicians can determine whether the module is operating at 1G or 10G speeds. Higher optical power levels generally indicate 10G operation.

1.4 Spectrum Analysis

Spectrum analysis involves examining the spectral characteristics of the optical signal transmitted by the SFP module. Using an optical spectrum analyzer, technicians can analyze the signal's frequency content and identify patterns associated with specific data rates (such as 1G or 10G). This method provides a comprehensive understanding of the SFP module's operating characteristics.

2. What is the transmission distance of 1000BASE ZX?

2.1 1000BASE-SX

1000BASE-SX is a single-fiber 1000Mbps baseband transmission system. 1000BASE-SX also complies with the 802.3z standard and can only operate over multimode fiber.

1000BASE-SX uses 62.5/125μm multimode fiber and 50/125μm multimode fiber with a wavelength of 850nm. The maximum transmission distance using 62.5/125μm multimode fiber is 220m, while the maximum transmission distance using 50/125μm multimode fiber is 500m. 1000BASE-SX uses 8B/10B encoding.

The YXF-GE-M85L-05D is a high-performance, cost-effective module that supports data rates up to 1.25Gbps over multimode fiber and a transmission distance of up to 550m. The transceiver consists of two sections: the transmit section includes a laser driver and an 850nm VCSEL laser. The receive section includes a PIN photodiode with an integrated transimpedance preamplifier (TIA) and limiting amplifier. The module is hot-swappable to a 20-pin connector. The high-speed electrical interface is based on low-voltage logic circuitry with a nominal differential impedance of 100 ohms and is AC-coupled internally.

The optical output can be disabled using the LVTTL logic-high input TX_DIS. The transmit fault (Tx_Fault) output indicates that the module's transmitter has detected a fault condition related to laser operation or safety. The loss-of-signal (RX_LOS) output indicates the loss of the input optical signal at the receiver. The serial EEPROM in the transceiver allows users to access transceiver monitoring and configuration data via the two-wire SFP management interface. This interface uses a single address, A0h, and its memory map is divided into lower and upper memory areas. Basic digital diagnostic (DD) data is stored in the lower memory area, while specialized data is stored in a series of tables in the upper memory area.

2.2 1000BASE-LX

1000BASE-LX uses a long-wavelength laser signal source with a wavelength of 1270nm-1355nm.

1000Base-LX is a physical layer specification for Gigabit Ethernet over fiber-optic cabling, defined in IEEE 802.3z. The maximum reach over multimode fiber is 550m. LX stands for long wavelength. In contrast to 1000Base-SX, 1000Base-LX uses a long-wavelength laser (1310nm) across both multimode and single-mode fiber, whereas 1000Base-SX uses a short-wavelength laser across multimode fiber.

The YXF-GE-S31L-10D is a high-performance, cost-effective module that supports data rates up to 1.25Gbps over single-mode fiber and has a transmission distance of up to 10km. The transceiver consists of two parts: the transmitter section includes a laser driver and a 1310nm FP laser. The receive section includes a PIN photodiode with an integrated transimpedance amplifier (TIA) and limiting amplifier. The module is hot-swappable to a 20-pin connector. The high-speed electrical interface is based on low-voltage logic circuitry with a nominal differential impedance of 100 ohms and is AC-coupled internally.

The optical output can be disabled via the LVTTL logic-high input, TX_DIS. The transmit fault (Tx_Fault) output indicates that the module's transmitter has detected a fault condition related to laser operation or safety. The loss-of-signal (RX_LOS) output indicates the loss of the input optical signal at the receiver. The serial EEPROM in the transceiver allows users to access transceiver monitoring and configuration data via the two-wire SFP management interface. This interface uses a single address, A0h, and its memory map is divided into lower and upper memory areas. Basic digital diagnostic (DD) data is stored in the lower memory area, while specialized data is stored in a series of tables in the upper memory area.

2.3 1000BASE-ZX

1000Base-ZX (or 1000Base-ZX) is a Cisco-specified standard for Gigabit Ethernet communications. 1000BaseZX operates over standard single-mode fiber links with spans up to 43.5 miles (70 km). Using premium single-mode fiber or distributed mobile single-mode fiber, spans up to 62.1 miles (100 km) are possible. 1000BaseZX uses long-wavelength lasers (1550 nm). The 1000BASEZX GBIC is intended for use as a physical medium dependent (PMD) component for Gigabit Ethernet interfaces in various switch and router products. It operates at a signaling rate of 1250 baud and transmits and receives 8B/10B encoded data.

The YXF-GE-S55L-100D is a high-performance, cost-effective module that supports speeds up to 1.25 Gbps over single-mode fiber and transmission distances up to 100 km. The transceiver consists of two parts: the transmit section includes a laser driver and a 1550nm DFB laser. The receive section consists of a PIN photodiode, a transimpedance preamplifier (TIA), and a limiting amplifier. The module is hot-swappable to a 20-pin connector. The high-speed electrical interface is based on low-voltage logic circuitry, with a nominal differential impedance of 100 ohms. AC coupling is internally used in the module.

3. What is the dlfference between 1000BASE-lx lh and 1000BASE-zx interface?

1000BASE-LX/LH SFP optical modules comply with the IEEE 802.3z 1000BASE-LX standard and can be used in both single-mode and multimode applications. They can transmit up to 10 km with single-mode fiber and up to 550 m with multimode fiber. It's important to note that when using 1000BASE-LX/LH SFP optical modules with traditional multimode fiber, a mode conversion cable must be used on the transmitter side.

1000BASE-ZX SFP optical modules are also used in long-haul single-mode transmission applications, with a transmission distance of up to 70 km. If using 1000BASE-ZX SFP optical modules in applications with transmission distances significantly less than 70 km, an optical attenuator must be inserted in the link to prevent damage to the module's receiving end due to excessive optical power.