The main benefit of using CS connectors in a QSFP28-DD transceiver consists in giving the possibility to double the port density of a high throughput switch. Two CS connectors can fit in to the same front panel space of a QSFP-DD/OSFP transceiver as a single duplex LC connector or multimode MPO ribbon cable would usually fit. The CS connector is designed for 2x 100G/200G connections and is available in OM3, OM4, OM4+, and OM5 Multi-mode, as well as Single-mode varieties. It enables two duplexes in a single QSFP-DD/OSFP transceiver
#Duplex multimode lc connector definition Patch
Not to mix with SC connector, the CS connector was designed by Senko Advanced Components and introduced as a replacement for current duplex LC connectors which are too bulky for newer generations of transceiver interfaces and to increase the connector density in patch panels.Ĭompared to a standard duplex LC connector, the CS connector has a 40% width reduction, which is a high value proposition especially in data centres where space is at a premium. Less used but can be found is some specific SR8 transceivers. In this variant, one row of 16 fibres (all are used). Typically used for SR8 QSFP-DD/OSFP transceivers. The fibre density can be doubled by adding another row of 12 fibres. It is typically used with SR4 and PSM4 transceivers. The most common type of MPO connector has one row of 12 fibres, of which only 8 are used. MPO connector is a High-Density connector. This type is never used for optical transceiver connections. This may be useful when MPO Trunk cables are used to aggregate several duplex fibre pairs. On a 12-fiber cable this means the Position 1 on one terminal connects to Position 12 on the opposite terminal.ģ/ MPO Trunk Cable Type-C or Pairs flipped: Type-C cables has adjacent fibre pairs crossed, Position 1 on one terminal connects to Position 2 on the other end. There are three types present on the market:ġ/ MPO Trunk Cable Type-A or Straight: The individual fibre positions at each terminals are the same.Ģ/ MPO Trunk Cable Type-B or Reversed: The individual fibre positions are reversed. In order to accomplish a working optical connection, the transmitter of one device needs to be connected to the receiver of the other and vice versa. Typically, this means the fibres need to be crossed at some point along the link. Notice that optical transceivers always come with male connector meaning that only female MPO patch cords can be used to connect transceivers.Īn important property of MPO cabling is polarity. Unlike the SC or LC connector which are Male only, MPO connectors are coming in Male (with pins) and female (with guiding holes) versions. Originally a single row 12-fiber connector, there are now 8 and 16 single row fibre types that can be stacked together to form 24, 36 and 72 fibre connectors using multiple precision ferrules. Now there are several more suppliers investing and developing products with new features and fibre counts.
MPO can be used with Single Mode fiber and generally comes with APC (Angled Physical Contact) or with Multi Mode Fiber with UPC (Ultra Physical Contact). Over the years, the MPO connector family has evolved to support a wider range of applications and system packaging requirements. It has been standardized within the IEC 61754-7 and TIA 604-5. The “Multi Fiber Push On” has been the primary multiple fibre connector for high-speed telecom and data communications networks. The diameter of the ferrule is 1.25mm.Īvailable in simplex or duplex versions, LC connectors can be used with both single-mode and multi-mode fibre cables. One big advantage is the compact size (about half the size of an SC connector), which allows for higher port density on patch panels and transceivers. LC stands for Lucent Connector as it was originally developed by Lucent Technologies. Older form factors, like X2 and XENPAK, are coming with SC connectors only. This connector type is frequently used for Fast ethernet and Gigabit ethernet point-to-point connections using bidi SFP transceivers. The SC connector is also available with the ferrule polished at an angle (usually 8degrees) and is then called SC APC (green casing). SC connectors use a Æ2.5mm ceramic ferrule and come with a locking tab that enables push on / pull off mating mechanism for quick insertion and removal.Īvailable in simplex or duplex versions, SC connectors can be used with both single-mode and multi-mode fiber cables. SC for Subscriber Connector or Square Connector or even Standard Connector
This article will discuss the different types of connectors available on the market and which can be used with Skylane transceivers. Taking this fact into account, different types of fibre and optical connectors have to be used. Optical transceivers come in many form factors and for many different applications.
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