The DS26519 from Dallas Semiconductor reduces cost per port in channel service
units, data service units, multiplexers, switches, routers, channel banks, and
test equipment. This 16-port, T1/E1/J1 long- and short-haul transceiver doesn’t
need any mechanical relays for redundancy protection because it uses what Dallas
calls “hitless protection switching,” which presents high impedance
at transmit outputs and receive inputs whenever there’s no power.
Additionally, it offers software-selectable, internal receive- and transmit-side
termination for 75-Ω E1 coaxial, 100-Ω T1 twisted-pair, 110-Ω
J1 twisted-pair, or 120-Ω E1 twisted-pair applications. Performance monitoring
and diagnostics include a bit-error-rate tester; loss-of-signal indication;
analog, local, remote, and dual loopbacks; large error counters for BPV, CV,
CRC-6, CRC-4, and E-bit; in-band repeating-pattern generation/detection; and
JTAG.
Housed in a 484-pin heat-slug ball-grid array (HSBGA) package, the DS26519
costs $69.96 in sample quantities. The eight-port DS26518 comes in a 256-pin
BGA and costs $40.60.
Maxim Integrated Products
www.maxim-ic.com