The DS32506 (6 port), DS32508 (8 port), and DS32512 (12 port) line interface units (LIUs) are highly integrated, low-power, feature-rich LIUs for DS3, E3, and STS-1 applications. Each LIU port in these devices has independent receive and transmit paths, a jitter attenuator, full-featured pattern generator and detector, performance-monitoring counters, and a complete set of loopbacks. An on-chip clock adapter generates all line-rate clocks from a single input clock. Ports are independently software configurable for DS3, E3, and STS-1 and can be individually powered down. Control interface options include 8-bit parallel, SPI™, and hardware mode.
Key Features
Applications/Uses
Pin-Compatible Family of Products
Each Port Independently Configurable
Receive Clock and Data Recovery for Up to 457 meters (1500 feet) of 75Ω Coaxial Cable
Standards-Compliant Transmit Waveshaping
Uses 1:1 Transformers on Both Tx and Rx
Three Control Interface Options: 8/16-Bit Parallel, SPI, and Hardware Mode
Jitter Attenuators (One Per Port) Can be Placed in the Receive Path or the Transmit Path
Jitter Attenuators Have Provisionable Buffer Depth: 16, 32, 64, or 128 Bits
Built-In Clock Adapter Generates All Line-Rate Clocks from a Single Input Clock (DS3, E3, STS-1, 12.8MHz, 19.44MHz, 38.88MHz, 77.76MHz)
Per-Port Programmable Internal Line Termination Requiring Only External Transformers
High-Impedance Tx and Rx, Even When VDD = 0, Enables Hot-Swappable, 1:1 and 1+1 Board Redundancy Without Relays
Per-Port BERT for PRBS and Repetitive Pattern Generation and Detection
Tx and Rx Open and Short Detection Circuitry
Transmit Driver Monitor Circuitry
Receive Loss-of-Signal (LOS) Monitoring Compliant with ANSI T1.231 and ITU G.775
Automatic Data Squelching on Receive LOS
Large Line Code Performance-Monitoring Counters for Accumulation Intervals Up to 1s
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