Cisco GSR10-CSC Clock Scheduler Card for 12000 Series GSR Routers

Cisco GSR10-CSC Clock Scheduler Card for 12000 Series GSR Routers is a clock and timing board for Cisco routing equipment.

The timing board is the part nobody thinks about until circuits start erroring. It distributes the reference every card in the chassis locks to, and on a network carrying TDM circuits or mobile backhaul a degraded reference does not stop traffic: it produces slips and errors spread across many circuits at once, which get blamed on almost everything else first. If the node is a timing source for anything downstream, this board’s redundancy matters more than its price.

This listing carries no specification text, which is why this page describes the family rather than the exact configuration. Routers of the same model were frequently sold in several configurations differing in memory, interface cards, power supply and licensing, and those differences matter more than the model name does. We can pull the exact specification for this part number from the vendor’s own database before you order.

Three questions worth answering before any router purchase, whatever the model. What the throughput requirement actually is with your feature set enabled, rather than the datasheet figure measured without it. Whether the features you need are licensed as well as present, since on most platforms security and performance are separate entitlements. And how many slots or ports you will need in three years, because adding capacity is cheap and replacing a chassis is not.

Confirm the chassis, the software release and what is already fitted before ordering, because control processors are tightly tied to all three and a mismatched pair will refuse to form a redundant set. Tell us whether this is a spare, an upgrade or a second unit for redundancy and we will make sure it matches what is in the chassis.

Green Code Technologies is a supplier of Cisco, and we supply Huawei and Juniper networking alongside HPE, Dell, Samsung, Netgear, Ubiquiti and Asus. We would rather tell you a part is no longer supported, or that we need to check it, than take an order for something that will not do what you need.

The Cisco GSR10-CSC is a critical switch fabric component. It is designed for the Cisco 12000 Series Gigabit Switch Routers (GSR).

This module functions as a Clock Scheduler Card (CSC). It provides system timing, synchronization, and scheduling for the router’s switch fabric.

In the Cisco 12410 router, the switch fabric requires two CSC modules:

• One active CSC for operation
• One standby CSC for redundancy

The GSR10-CSC is part of a high-capacity switching system. It supports up to 200 Gbps switching fabric bandwidth, ensuring efficient packet forwarding in core networks.

This card plays a key role in:

• Synchronizing data flow across line cards
• Managing traffic scheduling within the switch fabric
• Maintaining system stability and performance

The module is typically used in carrier-grade environments, including:

• ISP core networks
• Large enterprise backbone infrastructure
• High-capacity routing deployments

⚠️ Note: The Cisco 12000 series (including this module) is End-of-Life (EOL) and mainly available in refurbished markets today.

Key Features:

• Clock Scheduler Card for Cisco 12000 (GSR) routers
• Provides timing and synchronization for switch fabric
• Supports high-capacity switching (up to 200 Gbps)
• Required in redundant pairs (active + standby)
• Ensures stable and efficient traffic scheduling
• Designed for carrier-grade core networks