2-2
P
ROTEGÉ
® 616 I
NSTALLATION AND
M
AINTENANCE
M
ANUAL
, F
EBRUARY
2001
2. Cabling and MDF
Cabling and wiring used for the 616 system should
meet or exceed the following specifications.
2.1 Wiring Overview
Connections between CO lines, station instruments,
external equipment and the 616 board are made at
the Main Distribution Frame (MDF). See Figure 2-1.
For standard telephony wiring, the MDF usually
consists of a 3/4" wood backboard mounted on a
wall in the utility closet where the system switching
components will be installed. One standard 66M1-50
type terminal block is attached to the backboard for
the actual wire connections.
2.2 Station Wiring
Protegé station equipment requires unshielded,
twisted pair (UTP) 24-gauge cable. Each station uses
only one wire pair. For convenience in terminating,
however, two pair is recommended. The second pair
can be used as a backup connection if the first pair is
damaged. All unused pairs should be grounded at
the MDF.
The station cable runs must not exceed the lengths
listed in Table 2-2: Maximum Loop Distance and
Cable Resistance.
2.3 Interface Cable
The Protegé 616 KSU and 3x8 expansion board each
require one 25-pair amphenol-type (male-ended)
interface cable for terminating the CO lines and digi-
tal extensions. This cable may be purchased in a 2-3
foot length with a 66M1-50 block already terminated.
Alternatively, the cable can be prepared on site.
Instructions on preparing this cable are not included
in this manual.
2.4 Grounding Cables
Sprint Products Group highly recommends ground-
ing all unused cable pairs at the MDF to an earth
ground point.
2.5 Station Modular Jacks
Terminate station cable runs on modular jacks
mounted near where the station instrument will be
placed. Each station requires a 1-pair connection.
2.6 Terminal Block
Use one 66M1-50 style terminal block to terminate
the KSU interface cable for station and line connec-
tions. Terminate the KSU interface cable on the right
side of the block. Terminate the station and line
cables on the left side of the block. Each line and sta-
tion cable requires a two-wire connection. Use bridg-
ing clips to complete the connection after the
terminal block has been punched down.
Important:
Make sure that the system power is off while
making terminal block connections. Shorting punch block
terminals together can damage the KSU.
2.7 Phono Jack Connections
The KSU has two mono, 1/8" mini-phono jacks.
These can be used for external music source and
external paging. The music source's optimum input
level is 0 dB, 600 ohm input impedance. The external
paging source's optimum output level is 0 dB, 600
ohm output impedance.
Type of Extension
Digital
Analog
Loop Distance
1312 ft (400m)
1312 ft (400m)
Cable Resistance
70 ohms
70 ohms
Maximum Loop Distance
and Cable Resistance
Table 2 - 2: Maximum Loop Distance and Cable Resistance
