Datasheet

DS21455/DS21458 Quad T1/E1/J1 Transceivers
12 of 269
2.4 Jitter Attenuator
 32-bit or 128-bit crystal-less jitter attenuator
 Requires only a 2.048MHz master clock for both E1 and T1 operation with the option to use
1.544MHz for T1 operation
 Can be placed in either the receive or transmit path or disabled
 Limit trip indication
2.5 Framer/Formatter
 Fully independent transmit and receive functionality
 Full receive- and transmit-path transparency
 T1 framing formats include D4, ESF, J1-D4, J1-ESF and SLC-96
 Japanese J1 support for CRC6 and yellow alarm
 E1 framing formats include FAS, CAS, and CRC-4
 Detailed alarm- and status-reporting with optional interrupt support
 Large path- and line-error counters for:
 T1 – BPV, CV, CRC6, and framing bit errors
 E1 – BPV, CV, CRC-4, E-bit, and frame alignment errors
 Timed or manual update modes
 User-defined Idle Code Generation on a per-channel basis in both transmit and receive paths
 Digital milliwatt code generation on the receive path
 ANSI T1.403-1998 support
 G.965 V5.2 link detect
 RAI-CI detection and generation
 AIS-CI detection and generation
 Ability to monitor one DS0 channel in both the transmit and receive paths
 In-band repeating-pattern generators and detectors
 Three independent generators and detectors
 Patterns from 1 bit to 8 bits or 16 bits in length
 RCL, RLOS, RRA, and RAIS alarms interrupt on change of state
 Flexible signaling support
 Software- or hardware-based
 Interrupt generated on change of signaling data
 Receive-signaling freeze on loss of sync, carrier loss, or frame slip
 Hardware pins to indicate carrier loss and signaling freeze
 Automatic RAI generation to ETS 300 011 specifications
 Expanded access to Sa and Si bits
 Option to extend carrier-loss criteria to a 1ms period as per ETS 300 233