Interface Pinouts

These modules may have either the UP/DOWN switch type or the ON/OFF slide switch type. Each type is illustrated below.

Switches

up down

1 2 3 4 CSU/DSU LINE

Figure D-1 Rear View of ATL-CSU/DSU Link Module with UP/DOWN Switches

Figure D-2 View of ATL-CSU/DSU Link Module with Sliding ON/OFF Switches

When connecting two bridge/routers back-to-back with CSU/DSU link modules, 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.

Switch number 1 determines whether the ATL-CSU/DSU link module will generate clocks or receive clocks. When switch 1 is down (on), the normal position, the module receives clock signals from the connected network. When switch 1 is up (up), the module will generate clocks. When a pair of routers are connected back-to-back with CSU/DSU link modules one module must be set to generate clocks and one module must be set to receive clocks.

On 64 Kbps units only, switch number 3 determines the mode of the ATL-CSU/DSU. When switch 3 is down (on), the ATL-CSU/DSU is in DDS (Digital Data Service) mode for normal connection to the 64 Kbps digital service. When switch 3 is up (off), the ATL-CSU/DSU is in LDM (Limited Distance Modem) mode for back-to-back connection with a null-modem cable.

On 56 Kbps units, the position of switch 3 is not a factor for back-to-back connection with a null-modem cable. Switch 1 must still be set as noted above.

A DSU/CSU crossover cable would be constructed as follows:	1 --> 7
	2 --> 8
	7 --> 1
	8 --> 2

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.