FEATURES
• Integrates 28 T1 framers, 21 E1 framers and a full featured M13 multiplexer with DS3 framer in a single monolithic device for terminating DS3 multiplexed T1 or E1 streams.
• Four fundamental modes of operation:
   • Up to 28 T1 streams M13 multiplexed into a serial DS3.
   • Up to 21 E1 streams multiplexed into a DS3 following the ITU-T G.747 recommendation (using the serial clock and data or H-MVIP system interfaces).
   • DS3 M13 Multiplexer with ingress or egress per link monitoring.
   • Unchannelized DS3 framer mode for access to the entire DS3 payload.
• Supports transfer of PCM data to/from 1.544 MHz and 2.048 MHz serial interface system-side devices. Also supports a fractional T1 or E1 system interface with independent ingress/ egress Nx64 Kbps rates. Supports a 2.048 MHz system-side interface for T1 mode without external clock gapping.
• Supports 8 Mbps H-MVIP on the system interface for all T1 or E1 links, a separate 8 Mbps H-MVIP system interface for all T1 or E1 CAS channels and a separate 8 Mbps H-MVIP system interface for all T1 or E1 CCS and V5.1/V5.2 channels.
• Supports a byte serial Scaleable Bandwidth Interconnect (SBI) bus interface for high density system side device interconnection of up to 84 T1 streams or 3 DS3 streams.
• Provides jitter attenuation in the T1 or E1 receive and transmit directions.
• Provides two independent de-jittered T1 or E1 recovered clocks for system timing and redundancy.
• Provides per-DS0 line loopback and per link diagnostic and line loopbacks.
• Provides an on-board programmable binary sequence generator and detector for error testing at DS3 rates. Includes support for patterns recommended in ITU-T O.151.
• Also provides PRBS generators and detectors on each tributary for error testing at DS1, E1 and NxDS0 rates as recommended in ITU-T O.151 and O.152.
• Provides robbed bit signaling extraction and insertion on a per-DS0 basis.
• Provides programmable idle code substitution, data and sign inversion, and digital milliwatt code insertion on a per-DS0 basis.
• Supports the M23 and C-bit parity DS3 formats.
• Standalone unchannelized DS3 framer mode for access to the entire DS3 payload.
• When configured to operate as a DS3 Framer, gapped transmit and receive clocks can be optionally generated for interface to link layer devices which only need access to payload data bits.

APPLICATIONS
• High density T1 interfaces for multiplexers, multi-service switches, routers and digital modems.
• High density E1 interfaces for multiplexers, multi-service switches, routers and digital modems.
• Frame Relay switches and access devices (FRADS).
• M23 Based M13 Multiplexer.
• C-Bit Parity Based M13 Multiplexer.
• Channelized and Unchannelized DS3 Frame Relay Interfaces.