MX240 SCBE-MX Description

The Enhanced Control Board for the MX-Series Universal Router (SCBE-MX) serves the carrier Ethernet services router and carrier Ethernet transport markets that require higher-capacity traffic support demanding greater interface density (slot and capacity scale), as well as improved services. The upgraded SCB is supported on MX960, MX480, and MX240 routers. Here are some key attributes of the SCBE-MX:

• 160 Gbps/slot bandwidth with redundant fabric support, and improved fabric performance by using the next-generation fabric (XF) chip

• A central clocking module and a centralized clocking architecture that supports clock cleanup and distribution. The Stratum 3 clock module performs clock monitoring, filtering, and holdover in a centralized chassis location

• Full performance with fabric redundancy for higher capacity line cards such as 16x10GE and MPC3

The Routing Engine installs directly into a slot on the SCBE-MX (see Figure 1).

Figure 1: SCBE-MX

SCBE-MX Slots

You can install one or two SCBEs. The SCBE-MXs install horizontally into the front of the chassis in the slots labeled 0 and 1. If any slots are empty, you must install a blank panel.

SCBE-MX Redundancy

If two SCBE-MXs are installed, one SCBE-MX functions as the master SCBE-MX and the other as its backup. If the master fails or is removed, the backup restarts and becomes the master.

SCBE-MX Components

Each SCBE-MX consists of the following components:

• I2C bus logic, used for low-level communication with each component

• Component redundancy circuitry

• Control Board/Routing Engine mastership mechanism

• Gigabit Ethernet switch that is connected to the embedded CPU complex on all components

• External clock interface—Allows BITS or GPS clock source input to the centralized timing circuit, or allows centralized timing to be output to BITS or GPS

• Switch fabric—Provides the switching functions for the DPCs, FPCs, and MPCs

• Control field-programmable gate array (FPGA)—Provides the Peripheral Component Interconnect (PCI) interface to the Routing Engine

• 1000Base-T Ethernet controller—Provides a 1-Gbps Ethernet link between the Routing Engines

• Circuits for chassis management and control

• Power circuits for the Routing Engine and SCBE

• LEDs—Provide status of the SCBE and clocking interface

SCBE-MX LEDs

The FABRIC ACTIVE, FABRIC ONLY, and OK/FAIL LEDs indicate the status of the SCBE-MX. The BITS, GPS, and UTI LEDs, located next to the EXT CLK port, indicate the status of the respective clocking interface. Table 1 describes the functions of the SCBE-MX LEDs.