We have over 300 tested used units in stock! All-rate DSU/CSU with embedded SNMP Synchronous loop and DTE rates from 2.4 Kbps to 57.6 Kbps Asynchronous DTE rates from 2.4 Kbps to 57.6 Kbps Automatic rate adaption Point-to-point, point-to-multipoint or Frame Relay EIA-232 and V.35 DTE interfaces SLIP/PPP or optional 10BaseT Ethernet module for SNMP management Derives timing from an internal oscillator, the network, or an external DTE device User-programmable via front panel keypad and LCD screen AC power Automatic switched backup for point-to-point circuits via V.34 modem (33.6 kbps) Availability: Usually ships the same business day. ADTRAN DSU IV ESP W/ V.34 DBU CARD 1204011L1 1204011L1Regular price: $300.00Now: $125.00 Call us if you have any questions about online store at 201-843-9363 x7025 or email * SHIPPING RATE INFORMATION: Press the "Order" Button, then press "Checkout" and enter your Shipping Address. The system will then calculate the shipping cost. You will always see a calculated total on our site before final checkout. When you see this total you will have the options to send order, cancel order, or go back and change options. The system calculation is not always correct. Therefore, we reserve the right to review the shipping cost, but if a change is needed, we will not ship until we receive confirmation from you.