All-rate DSU/CSU with embedded SNMP Asynchronous transfer from 2.4 to 57.6 kbps Synchronous transfer to 64 kbps Automatic rate adaption Point-to-point, point-to-multi-point, or Frame Relay EIA-232 and V.35 DTE interfaces SLIP/PPP or optional 10BaseT Ethernet Automatic switched backup for point-to-point circuits via optional 4-wire switched 56, V.34 modem, or 1 B+D ISDN BRI module Available bundled with ESP Ethernet module 1204005L1 ($99 extra,call for this option) Availability: Usually ships the same business day. Adtran DSU IV ESP 1204011L1 1204011L1$443.00 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.