The Subscriber Connector (SC), also known as the Standard Connector or Square Connector, is a type

of fiber optic connector commonly used in data networking environments. It is frequently associated

with multi-mode fiber optic cables, which are typically used for short to medium-range connections

within data centers, campus networks, or building interconnections.

Here's a detailed look at each option:

1. Option A - straight-mode:

o

This is not a recognized type of fiber optic cable. Fiber optic cables are generally categorized

into single-mode and multi-mode, with no standard cable type called "straight-mode."

2. Option B - single-mode:

o

Single-mode fiber (SMF) is used for long-distance communication, typically involving lasers

and narrow core fibers. While SC connectors can technically be used with single-mode fiber, LC

(Lucent Connector) connectors are more common in modern single-mode applications due to their

compact size and improved performance for high-density connections.

3. Option C - dual-mode:

o

"Dual-mode" is not a correct term in fiber optics. Fiber optic cables are classified into single-

mode and multi-mode, but "dual-mode" is not used as a designation for any standard fiber optic

cable type.

4. Option D - multi-mode:

o

Correct. Multi-mode fiber (MMF) is commonly used with SC connectors. Multi-mode fiber is

designed for shorter distances, and SC connectors are a standard choice for multi-mode fiber

installations, especially in older infrastructure. Multi-mode fiber optic cables are commonly used

within data centers and enterprise LAN environments for intra-building or intra-campus links where

distances are generally shorter than with single-mode fiber.

Cisco Datacenter Networking Device Reference:

•

Cisco Network Switches and Modules: In data center environments, Cisco Nexus and Catalyst

switches often support SC connectors with multi-mode fiber for short to medium-distance

connections. Many Cisco SFP transceivers for multi-mode fiber are designed for SC or LC connectors.

•

Fiber Optic Cabling Standards: SC connectors remain a staple in multi-mode fiber

installations, particularly in legacy systems where this connector type was commonly used before the

industry shift toward smaller form factor connectors like LC for higher-density applications.

In summary, multi-mode fiber (MMF) is typically used with a Subscriber Connector (SC), as SC

connectors are common in multi-mode installations for data centers and enterprise environments.