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Specifications
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
Cabling and the Main Distribution Frame (MDF)
SPECIFICATIONS
2
2. CABLING AND THE MAIN DISTRIBUTION FRAME (MDF)
2.1 Connections between the trunks, station instruments, external equipment, and the sta-
tion and trunk circuit cards are made at the Main Distribution Frame (MDF). The MDF is
made up of industry-standard, 66M1-50-type terminal blocks [237A Krone blocks in Europe]
and, if using T1 or E1/PRI cards, eight-conductor (RJ48C) modular jack assemblies [RJ45s in
Europe]. Bridging clips are used on all terminal blocks to complete the connections.
2.2 With a U.S. system, the MDF requires at least a 4 × 6-foot (1.2 × 1.8-meter), ¾-inch (2-
cm) plywood backboard. (Depending on the number of stations and trunks installed, a larger
backboard may be necessary.) This allows room to mount the terminal blocks, modular jack
assemblies, Single-Line Adapters (SLAs), AC transformers, and any optional peripheral equip-
ment.
A. STATION CONNECTIONS
2.3 Station cable is connected to the MDF at one end, and a modular connecting block at
the other end. The modular line cord of the telephone is then plugged into the connecting
block.
• For each Executive Display Phone, Professional Display Phone, Standard Display
Phone, Associate Display Phone, Axxess Basic Digital Phone, Eclipse Basic Digital
Phone, single-line set, Model 8500, 8520, and 8560 Phones, and playback device,
twisted single-pair (24 AWG, level-1, 24 gauge thickness or larger—smaller number
gauge = larger thickness) cable is run from the station location to the MDF.
NOTE: The Professional Display, Associate Display, and Eclipse Basic Digital Phones
are supported by U.S. software only.
• For each analog phone (including Executone phones), twisted three-pair (24 AWG,
level-1, 24 gauge thickness or larger -- smaller number gauge = larger thickness) cable
is run from the station location to the MDF.
NOTE: If desired, two- or three-pair twisted cable and four- or six-conductor modular jacks
may be used for all station connections. This allows the various types of station instruments to
be easily interchanged, if necessary. (If three-pair cable is used, extra terminal blocks and
cross-connect wiring techniques are required.)
2.4 For a complete list of station cabling requirements, see page 3-16.
2.5 Industry-standard, 25-pair telephone cable is used to connect the station blocks to their
corresponding station cards. Female 50-pin amphenol-type connectors on the cables attach to
the male connectors on the station cards in the chassis.
2.6 To help reduce EMI and RFI, it may be necessary to equip the trunk cables with ferrite
beads. (See page 3-26 for more information.) Two ferrite split beads (two half beads) are
installed on each 25-pair cable just below the amphenol-type connector. The part number for a
single split bead is 808.1195.
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