Ksu Wiring; Mdf (Main Distribution Frame); No Mdf - Comdial DX-80 Installation And Maintenance Manual

KSU Wiring

Note: System power should be OFF before plugging in the station cable or while servicing port connections
at the punch-down block (66M1-50). (Although each port is over-current protected, unnecessary shorting
should be avoided.)
The 408M/E, APM4 (Analog Port Module), COM4 (CO Line Module) and DPM8 (Digital Port Module) are equipped
with RJ-11 modular jacks for each of the interfaced ports. This connection scheme allows for two methods of
installation. The first method (traditional "MDF") is recommended whenever possible to allow for maximum
serviceability.

MDF (Main Distribution Frame)

Whenever the various ports of the DX-80 are extended to the MDF, modular ended cables must be
extended from the KSU module port to the MDF connection block. The installer has many choices when
completing these connections and it is left to the installer's discretion to use the most suitable industry
standard wiring practice for the particular installation.
Whenever field-crimped modular connectors are used, USE A QUALITY
Note:
CRIMPING TOOL to fasten the modular connector to the cable pair.
Use a cheap tool...expect bad connections!
Many third-party vendor products are available to aid in this installation procedure. The examples below are
readily available at communications equipment / accessories supply houses. Although this example denotes
product of The Siemon Company
make decisions for use based on his / her own assessment. (Comdial is not responsible for the performance
of any product provided by a third-party (outside) vendor.)
The examples in the following chart are 25 pair (UTP), USOC, 24 AWG cables pre-fitted with modular
connectors on one end of the cable and a male or female AMP
termination on a specially equipped, 66-block with mating AMP
Product Number
HYD-F-24U1-03
HYD-F-24U1-07
HYD-F-24U1-10
HYD-M-24U1-03
HYD-M-24U1-07
HYD-M-24U1-10
When the KSU wiring is complete, each port of the DX-80 system may individually be isolated for
independent maintenance needs. The wiring in place is then terminated onto a 66M1-50 – connector
block(s). From this connector block - ports are extended to station cables using standard jumper wire.

No MDF

Since the Comdial DX-80 is equipped with RJ-11 interfaces for all port connections, it is possible to route
station cables into the KSU directly without use of 66M1-50 connector blocks. Using quality modular
connectors and crimping tool, each terminal cable can be connected directly to the port required. This
method of installation although initially convenient and less expensive, is not recommended due to the
inherent lack of serviceability.
P7290 IMM
DX-80 I
NSTALLATION AND
®
, the installer is urged to investigate the various products available and
The Siemon Company® Hydra Cable Assemblies
Length (feet)
3
7
10
3
7
10
2-5
M M
AINTENANCE ANUAL
®
type connectors on the other end for
®
type connector.
Wiring Scheme - End 1
25-Pair, Female
25-Pair, Female
25-Pair, Female
25-Pair, Male
25-Pair, Male
25-Pair, Male