Common use of Monitor Clock (Optional) Clause in Contracts

Monitor Clock (Optional). The CFP4 module may supply either a transmitter monitor clock or a receiver monitor clock for 4 x 25 Gbit/s applications. This option is not available for 4 x 10 Gbit/s applications. The monitor clock is intended to be used as a reference for measurements of the optical input or output. If provided, the clock shall operate at a rate relative to the optical network lane rate of 1/8 or 1/32 of 25 Gbit/s. Another option is a clock at 1/40 or 1/160 the rate of (host) transmitter electrical input data for 4 x 25 Gbit/s. Clock termination is shown in Figure 4-1. Detailed clock characteristics are specified in Table 4-3. The user can select the source of the Monitor clock. MDIO register bits to select the source of the MCLK for CFP4 module is prepared in VR region. Please refer to Ref.[3] for details. Table 4-3: Optional Monitor Clock Characteristics Min. Typ. Max. Unit Notes Impedance Zd 80 100 120 Ω Frequency See Table 4-4: CFP4 Module Clocking Signals Output Differential Voltage VDIFF 400 1200 mV Peak to Peak Differential Clock Duty Cycle 40 60 % Table 4-4: CFP4 Module Clocking Signals Clock Name Status I/O M x 25 Gbit/s Default Host Lane Rate Optional Rate Datacom 100GBASE-SR4/LR4/ER4 /SR10 Telecom OTU4 REFCLK Optional I 1/160 (161.1328 MHz) or 1/40 (644.5313 MHz) 1/160 (174.7031 MHz) or 1/40 (698.8123 MHz) MCLK Optional O 1/8 (3.22266 GHz) or 1/32 (805.665 MHz) or 1/40 (644.5313 MHz) or 1/160 (161.1328 MHz) 1/8 (3.49406 GHz) or 1/32 (873.515 MHz) or 1/40 (698.8123 MHz) or 1/160 (174.7031 MHz) Clock Name Status I/O M x 10 Gbit/s Default Host Lane Rate Optional Rate Datacom 40GBASE-SR4/LR4/ER4 40GBASE-FR Telecom OC-768/STM-256,OTU3 REFCLK Optional I 1/64 of host lane rate 1/64 of host lane rate 1/16 of host lane rate Note: Multi-protocol modules are recommended to adopt the clock rate used in Telecom applications.

Monitor Clock (Optional). ‌ The CFP4 module may supply either a transmitter monitor clock or a receiver monitor clock for 4 x 25 Gbit/s applications. This option is not available for 4 x 10 Gbit/s applications. The monitor clock is intended to be used as a reference for measurements of the optical input or output. If provided, the clock shall operate at a rate relative to the optical network lane rate of 1/8 or 1/32 of 25 Gbit/s. Another option is a clock at 1/40 or 1/160 the rate of (host) transmitter electrical input data for 4 x 25 Gbit/s. Clock termination is shown in Figure 4-1. Detailed clock characteristics are specified in Table 4-3. The user can select the source of the Monitor clock. MDIO register bits to select the source of the MCLK for CFP4 module is prepared in VR region. Please refer to Ref.[3] for details. Table 4-3: Optional Monitor Clock Characteristics Min. Typ. Max. Unit Notes Impedance Zd 80 100 120 Ω Frequency See Table 4-4: CFP4 Module Clocking Signals Output Differential Voltage VDIFF 400 1200 mV Peak to Peak Differential Clock Duty Cycle 40 60 % Table 4-4: CFP4 Module Clocking Signals Clock Name Status I/O M x 25 Gbit/s Default Host Lane Rate Optional Rate Datacom 100GBASE-SR4/LR4/ER4 /SR10 Telecom OTU4 REFCLK Optional I 1/160 (161.1328 MHz) or 1/40 (644.5313 MHz) 1/160 (174.7031 MHz) or 1/40 (698.8123 MHz) MCLK Optional O 1/8 (3.22266 GHz) or 1/32 (805.665 MHz) or 1/40 (644.5313 MHz) or 1/160 (161.1328 MHz) 1/8 (3.49406 GHz) or 1/32 (873.515 MHz) or 1/40 (698.8123 MHz) or 1/160 (174.7031 MHz) Clock Name Status I/O M x 10 Gbit/s Default Host Lane Rate Optional Rate Datacom 40GBASE-SR4/LR4/ER4 40GBASE-FR Telecom OC-768/STM-256,OTU3 REFCLK Optional I 1/64 of host lane rate 1/64 of host lane rate 1/16 of host lane rate Note: Multi-protocol modules are recommended to adopt the clock rate used in Telecom applications.. 5 MECHANICAL SPECIFICATIONS‌