20.1.5 40GBASE-R

This section describes an Ethernet interface that uses a 40GBASE-R optical fiber cable.

<Structure of this section>

(1) Connection interface

40GBASE-SR4,40GBASE-LR4, and 40GBASE-CR4 are supported. The line rate supports 40Gbit/s, full-duplex, fixed-connection or auto-negotiated connection.

40GBASE-SR4

Used for short-distance connections. Only full-duplex fixed connections are supported (multi-mode, transmission length: max 150m*).

40GBASE-LR4

Used for medium-distance connections. Only full-duplex fixed connections are supported (single-mode, transmission distance-max 10km*).

40GBASE-CR4

Used for short-distance connections. Only auto-negotiated connections are supported. (Transmission range: max. 5m*)

#: The maximum distance depends on the cable used. For the transmission distance for each cable, refer to the "Hardware Instruction Manual".

(2) Connection Specifications

The following table describes the connection specifications for each connection interface. For the physical specifications of 40GBASE-R, refer to the "Hardware Instruction Manual".

Table 20-9: Connection specifications
Remote device		Connection interface of the Switch
Method	interface	40GBASE-SR4 40GBASE-LR4	40GBASE-CR4
Method	interface	40GBASE full-duplex fixed	40GBASE full duplex Auto-negotiation
Fixed settings	40GBASE full duplex	40GBASE full duplex	NG
Auto- negotiation	40GBASE full duplex	NG	40GBASE full duplex

Legend: NG: A connection is not possible

(3) Notes on connection

Operation is not guaranteed if a transceiver other than the one shown in the "Hardware Instruction Manual" is used.
When QSFP + is used, it takes 3 to 5 seconds to determine the line type of the operation-command show interfaces after the transceiver is inserted.
When using a direct attach cable, it takes 3 to 5 seconds for the line type of the operation-command show interfaces to be determined after the transceiver is inserted. It also takes 5 to 8 seconds to link up.