The DS2153Q is a first-generation line interface unit for E1 lines that pioneered single-chip integration of multiple functions combining long- and short-haul and framing functionality with dual elastic stores and an 8-bit parallel control port. It is pin- and function-compatible with the DS2151Q, its T1 counterpart. It continues to provide an adaptable, single-chip interface unit at both central office and local E1 network interfaces.
The DS2153Q meets all E1 specifications, including ITU G.703, G.704, G.706, G.823, and I.431 as well as ETSI 300 011, 300 233, TBR 12, and TBR 13.Under processor control, the user can access the 71 8-bit internal registers to configure the DS2153Q to suit the application.
Complete E1 (CEPT) PCM-30/ISDN-PRI transceiver
LIU for clock/data recovery and waveshaping
32-bit or 128-bit jitter attenuator
Generates line build-outs for both 120Ω and 75Ω lines
Frames to FAS, CAS, and CRC4 formats
Dual elastic buffers connect to backplanes up to 8.192MHz
8-bit parallel control port for muxed or nonmuxed buses
Extracts/inserts CAS signals
Detects/generates remote and AIS alarms
Programmable output clocks for Fractional E1, H0, and H12
Independent transmit and receive functions
Full access to both Si and Sa bits
Three separate testing loopbacks
Counters for bipolar code, CRC4, and code FAS errors and Ebits