DS3101 datasheet(11/149 Pages) DALLAS

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DS3101 Stratum 3/3E Timing Card IC

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5.4

Output Clock Features

11 output clocks

Five programmable-frequency CMOS/TTL output clocks drive any internally produced clock up 77.76MHz

Two programmable-frequency LVDS output clocks drive any internally produced clock up to 311.04MHz

Two sync pulses, 2kHz and 8kHz, can be disciplined by a 2kHz or 8kHz sync input

One 1.544MHz/2.048MHz output clock

One 64kHz composite clock output (AMI format)

Output clock rates include 2kHz, 8kHz, NxDS1, NxDS2, DS3, NxE1, E3, 19.44MHz, 38.88MHz, 51.84MHz,

62.5MHz, 77.76MHz, 125.0MHz, 155.52MHz, and 311.04MHz

Outputs at even divisors of 311.04MHz have less than 0.5ns peak-to-peak output jitter

5.5

Redundancy Features

Devices on redundant timing cards can be configured for master/slave operation

Clocks and frame syncs can be cross-wired between devices to ensure that slave always tracks master

Master/slave mode pin can auto-configure slave to track master with no phase build-out and wider bandwidth

Input clock priority tables can easily be kept synchronized between master and slave

5.6

Composite Clock I/O Features

Two composite clock receivers and one composite clock transmitter (all AMI format)

Compliant with Telcordia GR-378 composite clock, G.703 centralized clock, and G.703 Appendix II.1 Japanese

synchronization interfaces

Configurable for 50% or 5/8 duty cycle, 1V or 3V pulse amplitude, and 110

Ω/120Ω/133Ω termination

Received signals are monitored for LOS, AMI violations, presence/absence of the 8 kHz component, and

presence/absence of the 400Hz component (for G.703 Appendix II.1 option b)

Transmitter can generate or suppress the 8kHz component and/or the 400 Hz component (for G.703 Appendix

II.1 option b)

Composite clock receiver inputs can be configured as programmable-frequency CMOS/TTL inputs if composite

clock support is not needed

5.7

General Features

Operates from a single external 12.800MHz local oscillator (TCXO or OCXO)

On-chip local oscillator watchdog circuit

Microprocessor interface can be 8-bit parallel (Intel or Motorola, multiplexed or nonmultiplexed) or SPI serial

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