The DS21448 is a quad-port E1 or T1 line interface
unit (LIU) for short-haul and long-haul applications. It
incorporates four independent transmitters and four
independent receivers in a single 144-pin PBGA or
128-pin LQFP package. The transmit drivers
generate the necessary G.703 E1 waveshapes in
75Ω or 120Ω applications and the DSX-1 or CSU line
build-outs of 0dB, -7.5dB, -15dB, and -22.5dB for T1
applications.
Key Features
Applications/Uses
Four Complete E1, T1, or J1 LIUs
Supports Long- and Short-Haul Trunks
Internal Software-Selectable Receive-Side Termination for 75Ω/100Ω/120Ω
3.3V Power Supply
32-Bit or 128-Bit Crystal-Less Jitter Attenuator Requires Only a 2.048MHz Master Clock for E1 and T1, with the Option to Use 1.544MHz for T1
Generates the Appropriate Line Build-Outs With and Without Return Loss for E1, and DSX-1 and CSU Line Build-Outs for T1
AMI, HDB3, and B8ZS Encoding/Decoding
16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz Clock Output Synthesized to Recovered Clock
Programmable Monitor Mode for Receiver
Loopbacks and PRBS Pattern Generation/ Detection with Output for Received Errors
Generates/Detects In-Band Loop Codes, 1 to 16 Bits, Including CSU Loop Codes
8-Bit Parallel or Serial Interface with Optional Hardware Mode
Muxed and Nonmuxed Parallel Bus Supports Intel or Motorola
Detects/Generates Blue (AIS) Alarms
NRZ/Bipolar Interface for Tx/Rx Data I/O
Transmit Open-Circuit Detection
Receive Carrier Loss (RCL) Indication (G.775)
High-Z State for TTIP and TRING
50mARMSTransmit Current Limiter
JTAG Boundary Scan Test Port per IEEE 1149.1
Meets Latest E1 and T1 Specifications Including ANSI.403-1999, ANSI T1.408, AT&T TR 62411, ITU G.703, G.704, G.706, G.736, G.775, G.823, I.431, O.151, O.161, ETSI ETS 300 166, JTG.703, JTI.431, TBR12, TBR13, and CTR4
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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