Appendix D

Interface Pinouts

Pinout Information

Each link interface available is described with detailed information on pin designation. Standard interface cables will provide correct connections to modems, datasets, or DSU/CSUs.

When connecting two bridge/routers back-to-back without modems, a null-modem cable is required to crossover the pins on the links. Crossing over the pins allows two bridge/routers both configured as DTE interfaces to be connected together. With this configuration, both bridge/routers will provide clocking for the links, and each bridge/router must have a link speed defined.

Link Clocking Information

All of the link interfaces on the router act as DTE devices, this means that they may be directly connected to DCE devices (modems, etc.) with the DCE devices providing the clocking for the link. The link speed is controlled by the DCE device. Setting the link speed on the router will not result in a speed change on the link.

Some DCE devices allow the DTE devices connected to them to supply a clock signal which is then routed back to the transmit clock pins on the DCE interface. This clock is then received by the router link interface. By using this method, the router may be in control of the link speed. The link speed may also be controlled by the router when a null- modem cable is used to connect two routers in a back-to-back configuration.

Changing the link speed within the menu system of the router changes the clock output speed that is generated on the DTE Terminal Timing pins (external clocking pins) on the link interfaces.

ATL-CSU/DSU Link Module Information

The router is currently produced with LXT CSU/DSU interface modules; however, the earlier model ATL CSU/DSU module is still compatible with the router and may be used with it. Note that ATL master mode signaling is not compatible with the current standard 64K master mode signaling; therefore, for back to back connections, an ATL unit will only operate at 64K when connected to another ATL unit. If one interface is an ATL unit and the other is not, back to back operation must be set to 56K.

The ATL-CSU/DSU link module is normally configured to receive clock from the connected network. When two ATL-CSU/DSU link modules are to be used on a leased line in a back-to-back set-up, one of the modules must provide the clock.

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Black Box LR5200A-R2, LR5100A-T manual Pinout Information, Link Clocking Information, ATL-CSU/DSU Link Module Information
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LR5200A-R2, LR5100A-T specifications

The Black Box LR5100A-T and LR5200A-R2 are advanced network media converters designed to facilitate seamless data transmission across various media types. These devices are particularly valuable for organizations seeking high-performance solutions for extending network communications beyond traditional limits.

The LR5100A-T is an Ethernet media converter that operates over twisted pair cabling, efficiently converting 10/100/1000 Mbps Ethernet signals into fiber optic signals. This capability allows businesses to harness the long-distance advantages of fiber optics while maintaining compatibility with existing Ethernet infrastructure. With a broad range of supported distances, users can effectively communicate over distances up to 100 kilometers, depending on the type of fiber optic cable used and the transmission rate.

In contrast, the LR5200A-R2 emphasizes compatibility with a wider range of fiber types and supports both multimode and single-mode fiber connections. It also provides auto-negotiation capabilities, which enable it to automatically detect and configure to the optimal speed of connected devices, streamlining setup and enhancing user experience.

One of the key features of both the LR5100A-T and LR5200A-R2 is their rugged design, making them suitable for deployment in harsh environments. They are engineered to withstand extreme temperatures and are resistant to vibration, ensuring reliability in challenging settings. Additionally, both models adhere to industry standards, ensuring interoperability with a diverse array of networking equipment.

Notably, these converters come equipped with LED indicators that allow for real-time monitoring of device status, simplifying network management and troubleshooting. This feature ensures that technicians are promptly alerted to any connectivity issues, significantly reducing downtime.

Powering options for both models include standard AC power supplies or Power over Ethernet (PoE), allowing for flexible deployment scenarios without the need for additional power outlets. This flexibility can be a crucial factor in environments where power availability may be limited.

With their blend of performance, durability, and advanced features, the Black Box LR5100A-T and LR5200A-R2 media converters represent a solid choice for organizations looking to future-proof their network infrastructure while ensuring high levels of connectivity and reliability. Whether extending existing networks or implementing new solutions, these devices provide the necessary tools for effective communication in today’s digital world.
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