The GE VMIVME-5599 (VMIVME-5599 Automatic Fiber-Optic Bypass Switch) operates as a dedicated hardware component for maintaining network integrity within fiber-optic VMEbus communication rings. This module is designed to detect power loss at a network node and execute an automatic bypass, ensuring that the remaining nodes in the fiber-optic network continue to function without interruption. It provides both manual and remote operational controls to facilitate network maintenance and contingency management.

Hardware Specifications

Backplane bus communication velocity and firmware compatibility

The VMIVME-5599 integrates into the VMEbus backplane alongside high-speed reflective memory nodes such as the VMIVME-5576 and VMIVME-5588. To preserve deterministic network performance, the module's bypass switching latency must be synchronized with the network timing parameters defined in the host controller's configuration. Firmware flash compatibility is critical; users must ensure that the bypass logic is consistent with the communication protocols used by the reflective memory nodes to avoid packet loss during transition states. Proper mapping of the remote control pin on the P2 connector is required to enable automated diagnostic responses from the host CPU.

Frequently Asked Questions (FAQ)

Q: How does the module detect power loss for the bypass operation?

A: The module monitors its local power supply status. Upon detecting a loss of power, the internal switching mechanism activates to route the fiber-optic signal around the inactive node, thereby maintaining the continuity of the ring.

Q: Can the bypass be triggered without a power failure?

A: Yes, the module supports manual operation via a front panel switch and remote operation via a control pin on the P2 connector, allowing users to intentionally isolate a node for maintenance without breaking the fiber-optic loop.

Field Installation Guidelines

• Ensure the VMEbus chassis is powered down during initial installation to protect the fiber-optic transceiver and VME backplane pins.
• Seat the module in the same VMEbus backplane segment as the VMIVME-5576 or VMIVME-5588 nodes to ensure consistent bus timing.
• Utilize high-quality fiber-optic cables and perform careful cleaning of all optical interfaces to minimize signal insertion loss at the switch point.
• Verify the P2 connector wiring to ensure the remote control pin is correctly referenced to the controller's I/O signals.
• After installation, perform a bypass test—manually or via remote signal—to confirm that the fiber-optic ring remains active and stable when the node is isolated.