20.1.3 1000BASE-X

(1) Connection interface

1000BASE-SX,1000BASE-LX,1000BASE-LH, and 1000BASE-BX are supported. The transmission speed and duplex mode settings are fixed at 1000 Mbit/s and full duplex.

1000BASE-SX

Used to connect between short distances (multi-mode, max 550m).

1000BASE-LX

Used to connect between medium distances (single mode, max 5km/ multi mode, max 550m).

1000BASE-LH

Used to connect between long distances (single-mode, max 70km).

1000BASE-BX

A low-cost interface that uses a single-core optical fiber for which different wavelengths are used for sending and reception.

Because the upstream and downstream wavelengths are different, a pair of transceivers must be provided for each upstream and downstream.

The Switch supports the 1000BASE-BX10-D and 1000BASE-BX10-U interfaces, prescribed in IEEE 802.3ah, and the 1000BASE-BX40-D and 1000BASE-BX40-U interfaces, which are vendor-specific interfaces.

1000BASE-BX10-D/1000BASE-BX10-U

Used to connect between medium distances (single-mode, max 10km).

1000BASE-BX40-D/1000BASE-BX40-U

Used to connect between long distances (single-mode, max 40km).

You can configure either of the modes shown below. Select the appropriate mode for the network to be connected. The default for the Switch is auto-negotiation.

• Auto-negotiation

• 1000BASE-X full duplex (fixed)

Auto-negotiation is a function for determining the optimum connection operation between switches by communicating with remote devices for full-duplex and flow control. If auto-negotiation does not resolve the problem, the Switch repeats the connection operation until a link connection is established.

(2) Connection Specifications

The table below describes the connection specifications for transmission speed and duplex mode (full or half) for a connection between the Switch and a remote device. For the physical specifications of 1000BASE-X, refer to the "Hardware Instruction Manual".

Table 20-9: Connection specifications

Remote device		Settings on the Switch
Method	interface	Fixed settings	Auto-negotiation
		1000BASE full duplex	1000BASE full duplex
Fixed settings	1000BASE half duplex	NG	NG
	1000BASE full duplex	1000BASE full duplex	NG
Auto- negotiation	1000BASE half duplex	NG	NG
	1000BASE full duplex	NG	1000BASE full duplex

(3) Notes on connection

• Make sure that the remote device (such as a switching hub) uses auto-negotiation or the fixed full-duplex mode setting.

• Operation is not guaranteed if a transceiver other than the one shown in the "Hardware Instruction Manual" is used.