GE VMIACC-5595 Series Installation Manual
Introduction
The VMIACC-5595 is a managed hub, designed to operate with GE's VMIxxx-5565 Reflective Memory products. Without a hub device, the Reflective Memory nodes must be networked together in a daisy-chained loop. In the hub-less configuration, if one node becomes inoperable, the entire loop becomes disabled. When the VMIACC-5595 hub is incorporated into the network, the network is converted from a loop to a star configuration. In the star configuration, if one node becomes inoperative, that node is bypassed by the VMIACC-5595 and the remaining nodes on the network remain operational. When a network consists of a large number of nodes or if the nodes are widely dispersed over an area, the star configuration is easier to build and maintain.
The VMIACC-5595 automatically bypasses a port when it detects loss of signal or the absence of a valid synchronization pattern, allowing the remaining nodes to continue operating. Each port regenerates the serial optical signal, eliminating insertion losses and cable attenuation. Signal regeneration also reduces jitter.
The optical ports are implemented with Small Form-Factor Pluggable (SFP) transceivers (see Figure 1 on page 8). Only the required ports need to be populated.
The SFP transceivers can be a mix of multimode (short distance) or single-mode (long distance) transceivers. This feature permits cost savings in small networks, as well as system optimization. For larger networks, several VMIACC-5595 hubs can be cascaded, permitting a managed hub array with up to 256 nodes.
An RS232 port permits local monitoring and control of the Reflective Memory network using a standard PC serial port. The Ethernet port (10BaseT) can be used to monitor and control the hub from great distances through a Local Area Network (LAN) or with a Web browser.
The VMIACC-5595 is available as a 19-inch 1U rack-mountable enclosure or as a desktop enclosure. The universal power supply permits operation with nearly any international power standard. Figure 2 on page 9 is a functional block diagram of the VMIACC-5595 Hub Assembly.
The VMIACC-5595 can operate without the use of the Ethernet port or the RS232 port. When first activated, the VMIACC-5595 operates using the factory default configuration with each optical port in the auto bypass mode, and the bypass is based on detection of Loss of Signal (LOS).
Features
• Designed for use with GE's VMIxxx-5565 Reflective Memory products
• Provides up to 8 ports per hub assembly using Small Form-Factor Pluggable
• Hub assemblies can be cascaded up to the maximum 256-node limit
• Automatically bypasses disabled or disconnected nodes in a fiber-optic
• Automatic bypass controlled by the loss of signal or by the loss of sync pattern
• Each port regenerates the serial optical signal to eliminate link losses and to
• 10Base-T Ethernet TCP/IP port for remote access and control
• RS232 port for local access and control
• Available as either a 19-inch 1U rack mount or desktop enclosure
• Internal universal power supply
• Dark-on-Dark option turns off the board's transmitter controller if the receiver
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