Category: Hitachi

– Integrated Managed Layer 2 Switch

– 24… 60 VDC supply voltage

– 4x 10/100 BaseT (RJ45. auto-negotiation)

– 2x SHDSL ports (for copper)

– Redundant topology via Spanning Tree Protocol (STP/ RSTP/ MSTP)

– 1x RS-232/ RS-485 and 1x RS-232 interfaces for tunneling of serial protocols

Applications

The DIN-rail mountable 500NMD02 is a managed www.cniacs.com plug-and-play Layer 2 switch offering

– 4 Fast Ethernet auto-negotiating RJ45 ports with automatic MDI/X (automatic cross detection and correction)

– Two 2-wire SHDSL ports for dedicated copper cabling

– 1 RS-232/ RS-485 interface and 1 RS-232 interface for serial protocol tunneling

The switch provides redundant topology via Spanning Tree Protocol (STP/ RSTP/ MSTP). It supports VLAN framing and serial data tunnelling.

Ethernet can be distributed within the station via the switch’s four RJ45 ports.

The SHDSL port can be used for interstation interconnections up to a maximum distance of 25 km (0.8 mm diameter copper cable).

The SHDSL interface connects to any EDS500 SHDSL-compatible device, including the 560NMS24 and 560NMS34. as well as any EFM-based SHDSL device.

Features

For documentation purposes, the Ethernet ports are labelled 1 to 4 and there are no specific uplink ports.

All ports are functionally identical, and the SHDSL port is connected via a pluggable threaded connector.

The link and speed status of each Ethernet port and SHDSL port is indicated by status indicators (see ‘Connectors and Indicators’).

The switch learns the Ethernet address by analysing incoming frames and stores it in a lookup table (up to 2048 entries).

used to forward frames only to the correct port. If it is a broadcast or multicast, or if the destination address is not found in the lookup table, the

then the received frame is forwarded to all ports other than the receiving port. If an incoming frame with a specific source address does not refresh the entry in the lookup table, the

entry with a specific source address is not refreshed, the entry will age out in a maximum of 304 seconds (by default, this value is configurable).

For IEEE 802.1Q VLAN frames, the switch can be configured in VLAN or transparent mode.

In transparent mode, the switch does not change any frames or frame TAGs; in VLAN mode, the switch can be configured to support multiple applications.

In VLAN mode, the switch can be configured to support multiple applications, such as trunking or access ports.

The switch can support quality of service if it uses IEEE 802.1p-compliant frame formats.

The switch can divide frames into up to four queues, which can be configured as priority-based or weighted fair queues.

The 500NMD02 uses a wide-range power supply and operates from 24 to 60 V. The 500NMD02 can be configured to operate on a wide-range power supply.

The components themselves, the Ethernet ports, the SHDSL connections, the RS-232 interface, and the Extended Bus Interface (Ext) are all hot-swappable.

Applications

The 560NMD01 Top Hat DIN-Rail Appliance is a managed Layer 2 switch.

It provides four Fast Ethernet RJ45 ports with automatic MDI/X (Automatic Cross Detection and Correction) and a 2-wire SDSL interface.

The SDSL interface can be used to connect sites with distances of up to 20 km (copper cable, 0.8 mm diameter).

Thanks to the (fast) Spanning Tree Protocol, the switch enables a redundant topology.

For documentation purposes, Ethernet ports are labelled with numbers 1-4. There are no special uplink ports. All ports are functionally identical.

The SDSL ports are externally www.cniacs.com connected via backplane or expansion connectors. The connection (link) and speed status of all Ethernet and SDSL ports is indicated by LEDs on the front panel.

The switch “learns” Ethernet addresses by analysing received frames.

The addresses learned in this way are stored in the address table (up to 2048 entries) and are used to forward the frames to the correct interface.

Frames are forwarded to all interfaces only if they are received with a wide or multicast address, or if the destination address is not found in the address table.

If an entry in the address table is not acknowledged by the corresponding received frame, it is deleted after a maximum of 304 seconds (default).

IEEE 802.1Q-compliant VLAN configuration is supported. Frames can be transparently forwarded or assigned to (access or trunk) VLANs.

The switch can support quality of service if IEEE 802.1p-compliant frame formats are used. The switch can divide outbound frames into up to four priority-controlled queues.

The device has a wide-range power supply, requiring a voltage between 24 and 60 V. The switch can be used with a wide range of power supplies.

The Ethernet interface, SDSL, RS232 (Con 0) and the expansion bus interface (Ext) can be plugged in during operation (hot-swap).