Chapter 5: Installation
Installing a DEI
Page 5-54 Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008
DIGITAL EXPANSION INTERFACE (DEI)
The following sections provide processes and procedures required for installing digital interface
equipment.
Installing a DEI
This section describes installing the Inter-Tel Digital Expansion Interface (DEI) unit, the Digital
Endpoint Module (DEM-16), and the eight-port Single Line Module (SLM-8). Other digital
endpoint-related items are also discussed such as Single-Line Adapters (SLA) and supported
digital endpoint installations. Information on installing an external voice processing system is
also discussed.
Summary for Installing a New System or for Upgrading
Follow the new installation summary guidelines with any additions mentioned here. See “Pre-
Installation Checklist” on page 5-9.
• Run sufficient lengths of cable to any newly installed digital endpoints and to optional
equipment for connection to the MDF. See page 5-20. Allow for adequate strain relief.
Although CAT5e is recommended for new installations, existing CAT5 cabling is
acceptable. CAT5e provides better near-end crosstalk (NEXT) performance.
• Terminate the endpoint cables on modular jack assemblies [line jack units] at the endpoint
locations. See Table 5-7 for loop limits.
• On the MDF backboard, assemble any additional terminal blocks for digital endpoints,
including SLAs. See page 5-21.
o If any T1/PRI and/or E1/PRI trunks are to be installed, terminate them on eight-
conductor modular jack [line jack unit] assemblies at the MDF.
o Connect the trunks, endpoint cables, and module cables to the corresponding terminal
blocks. Connect T1/PRI and E1/PRI trunks to modular jack assemblies [RJ45 sockets].
o If installing any single line endpoints or non-T1 DID trunks (USA only), you may want
to attach the necessary SLAs and their corresponding modular jack [line jack unit]
assemblies on the MDF.
Table 5-7. Loop Limits for Digital and Single Line Endpoints
Endpoints
Port
Impedance
Loop Limit
(24 AWG)
From Base Server chassis:
• To a single line endpoint or playback device connected
to the built-in port
• To a single line endpoint or playback device driven by a
SLM-4 port
From DEI chassis: To a single line endpoint or playback
device driven by a SLM-8
600
Ω 2000 ft
(609 m)
REN 3.0
From DEI chassis:
• To digital endpoints
• To a digital endpoint equipped with PCDPM and MDPM
and connected to DSS unit(s) or SLA
62
Ω 1200 ft
(366 m)
From an MDPM: To a single line endpoint 195
Ω 3800 ft
(1158 m)
From an SLA: To single line endpoints or playback devices.
Supports facility code OL13C.
800
Ω 15,560 ft
(4742 m)
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