Hitachi 500NMD01 Compact Modem

- Integrated Managed Layer 2 Switch

- 24... 60 VDC supply voltage

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

- 1x SHDSL port for copper lines

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

- 1x RS-232/ RS-485 interface for tunneling of serial protocols

Applications

The DIN-rail mountable 500NMD01 is a managed plug-and-play Layer 2 switch that offers

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

- 1 2-wire SHDSL port for dedicated copper cable

- 1 RS-232/ RS-485 interface for tunneling of serial protocols

The switch provides a 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 will age out in up to 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, such as trunks 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 queues or weighted fair queues.

The 500NMD01 uses a wide-range power supply that operates from 24 to 60 V. The switch can be configured to operate on a wide-range power supply.

The switch itself, the Ethernet ports, as well as the SHDSL connection, the RS-232 interface, and the Extended Bus Interface (Ext) are hot-swappable.

Topology

The 500NMD01 offers a total of five ports for use with end devices, switches, bridges, hubs and routers.

The switches can be easily constructed in star, ring, or line topologies.

Redundant topologies can be automatically detected and processed via Rapid Spanning Tree Protocol (RSTP) or Multiple Spanning Tree Protocol (MSTP).

This is fully backward compatible with the widely used Spanning Tree Protocol (STP).

Management and Configuration

Management and configuration of the 500NMD01 can be accomplished via Telnet, Secure Shell (SSH), SNMP, RS-232. or Web interface.

All methods can be used to read or write device parameters.

In addition, the interface and alarm status of the device can be monitored via IEC 60870-5-101 or -104.

Existing configurations can be saved and restored. The configuration can also be stored in an external configuration stick (500NMA01).

This makes it simple to swap devices without trained personnel.

By default, the 500NMD01 switch is configured with an IP address of 10.0.0.2. a subnet mask of 255.0.0.0. and a gateway of 10.0.0.1.

Connections for configuration purposes can be accepted over any interface. All Ethernet ports are in the administrative state by default.

The RS-232 interface is preconfigured for a baud rate of 57600. 8 data bits, no parity, and 1 stop bit (57600.8N1).

Any terminal software (e.g. HyperTerminal) can access the command line interpreter configured through this interface.