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Accessories
DBU Module
Model # Part #  Description
4-Wire Switched 56 DBU Module 1204001L1 Modular 4-wire Switched 56 Dial Backup card, works in DSU IV ESP, TSU ESP, Express 5200 series, DSU IQ, TSU IQ, TSU IQ+ and IQ Probe. NOT COMPATIBLE WITH THE IQ 710.
V.34 DBU Card 1204002L2 Modular V.34 Dial Backup card, works in DSU IV ESP, DSU IQ, TSU IQ, TSU IQ+, IQ Probe and Express 5200 series. Replaces 1204002L1. NOT COMPATIBLE WITH THE IQ 710.
ISDN BRI DBU Module 1204004L1 Modular BRI ISDN (2B+D) Dial Backup card, works in DSU IV ESP, TSU ESP, Express 5200 series, DSU IQ, TSU IQ. TSU IQ+ and IQ Probe. NOT COMPATIBLE WITH THE IO710.
External DCE Module 1204006L1 Modular External DCE card, allows for DBU using an external DCE device Express 5200 series, TSU ESP, TSU IQ, TSU IQ+ or IQ Probe. DB25 interface that supports EIA-232 or V.35 (requires 1200193L1 or 1200194L1 V.35 adapter cable). NOT COMPATIBLE WITH THE 10 710.
IQ 710 V.34 DBU Module 1204002L3 Modular V.34 Dial Backup card, works in IQ 710.
IQ 710 ISDN BRI DBU Module 1204004L2 Modular BR! ISDN (2B+D) Dial Backup card, works in !Q 710.
IQ 710 External DCE Module 1204006L2 Modular External DCE card, allows for DBU using an external DCE device in IO 710.
IO 710 ISDN PRI DBU Module 1204008L2 Modular Primary Rate ISDN Dial Backup card, works in IQ 710.

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