NEUTRIK NPPA-TT-SD25 User manual

NEUTRIK AG NEUTRIK Zürich AG NEUTRIK (UK) Ltd. NEUTRIK USA INC. NEUTRIK Tokyo Ltd. NEUTRIK France NEUTRIK Vertriebs GmbH
Liechtenstein Switzerland Great Britain USA Japan France Germany/Netherlands/Austria
Tel.: [phone] Tel.: [phone] Tel.: [phone] Tel.: [phone] Tel.: [phone] Tel.: [phone] Tel.: [phone]
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www.neutrik.com
Draft. Nr.: BDA206
Update: 17.01.2008
Data subject to change without prior notice. ©2007 NEUTRIK . ALL RIGHTS RESERVED.
INSTRUCTION MANUAL
NPPA-TT-SD25
PATCH PANEL “Easy Patch” | 96 Bantam (TT) Jacks, 25 pin
D-subminiature

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NPPA-TT-SD25 Instruction Manual
Index
1. Electrical configuration.................................................................................................3
2. Replacement of Jack Pairs ..........................................................................................4
3. Reconfiguration by hand..............................................................................................5
4. Grounding variations ...................................................................................................7
5. Wiring ..........................................................................................................................8
6. Cable retention to the unit............................................................................................9
7. Channel identification ................................................................................................10
8. Technical data ...........................................................................................................11
9. Wiring Diagram..........................................................................................................12
10. Ordering Information................................................................................................13
Dimensional Drawing NPPA-TT-SD25
Front panel
Cable retention bar
Top cover

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NPPA-TT-SD25 Instruction Manual
1. Electrical configuration
The Neutrik ”Easy Patch” is fitted with high quality, long life NJ3TTA double contact jacks (2 x
48) with drastically improved contact integrity. The NJ3TTA double contact jacks are gold plated
and prewired. The Neutrik ”Easy Patch” is an innovative and compact patching system (just 1 U
high) for 19” rack mounting. Robustly housed in black coated steel casing and featuring
precision aluminum fittings it is built to last. The Neutrik ”Easy Patch” is suitable for analog and
digital audio signals.
The new generation of the Neutrik ”Easy Patch” is easily programmable for any out of five
electrical configurations:
•half normalled bottom row
•half normalled top row
•full normalled
•parallel
•isolated
The programming feature allows to set all possible switching configurations inside the jack pair
with a specially designed mechanism and individually for each channel.
Configuration Chart
The standard configuration on ”Easy Patch” NPPA-TT-SD25 is half normalled bottom row.
Modules NJ3TTA-4-.x. consisting of two “Plug-in Units” (or four jacks NJ3TTA) with
prefabricated normalling are also available.

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NPPA-TT-SD25 Instruction Manual
2. Replacement of Jack Pairs
Each individual jack pair can be exchanged or re-configured without fuss even while the unit is
“on air”. For replacement or re-configuration just remove the easy accessible module consisting
of two “Plug-in Units”.
Module consisting of 2 Jack Pairs
Remove Front Panel by unscrewing the 3 black cross-recessed
screws (M3x8 Taptite), remove the two side-stops.
Push out the channel identification strips.
Pull one module out of the casing using the supplied
disassembling pliers

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NPPA-TT-SD25 Instruction Manual
Alternatively the jack pairs may be pulled out by the use of two
Bantam plugs (diagonally plugged in).
The two jack pairs have to be re-assembled in the right way so
that the thicker body marked “left” is put on the left side with
the mark outside and readable.
To complete, push the new jack pairs into the casing again with the mark on the left side (If
more than one module are removed always assemble from the center to the right or left side
and be careful that the keys on the left side of the jack pairs find their guiding slots. If all jack
pairs are removed start at the casing support in the center and assemble to the right and left
side). Slide in again the channel identification strips (best from the outside inwards) and fix the
front panel with the black cross-recessed screws. Don’t forget to insert the side-stops before
fixing the screws (see page 10).
3. Reconfiguration by hand
For easy and safe modification work we recommend our preconfigured jack pairs (NJ3TTA-4-*).
Please note, in case of emergency the normalling can by changed by hand by the use of
normalling bars.
The two jack pairs are separated by spreading apart the rear
parts to unlock the fixing mechanism till it is possible...

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NPPA-TT-SD25 Instruction Manual
...to slide the jack pairs against each other in axial direction.
Then remove the cover with a tiny grip at the side and carefully
Pull out the configuration bars you need to exchange
(preferably using a small screw-driver).
Insert new bars carefully by pressing them in parallel at both
ends.
Attention: To ensure best contact conditions never reuse the
configuration bars once being put in place! Always take new
ones! Keep the contacts and switches in place with the thumb
while manipulating the normalling contacts.
Finally snap on the cover (Insert it first at one side and then
snap slightly into the opposite groove with a light pressure on
the nose).

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NPPA-TT-SD25 Instruction Manual
4. Grounding variations
The patch panel is terminated with 12 Sub-D connectors each of them corresponding to groups
(Sub-D groups) of 8 channels.
Grouping of individual channels
The ground contacts of top and/or bottom jacks of each channel can be connected to a Sub-D
Group by linking the circuit using the corresponding solder pads.
In the shipping condition each channel offers individual grounding (floating channel). For
grounding/grouping options solder pads are offered. Jack pairs have to be removed.
Each Sub-D group is configured by its own jumper block. The flexible grounding system
provides the following alternatives to choose from:
•Chassis Common: All channel grounds (top & bottom row) are
connected via PCB and jumpers to the patch panel
chassis.
•Sub-D-Group-Central: Ground contacts of top and bottom row are
connected but separated from chassis.
•Sub-D-Group-Chassis Top or Bottom:Either top or bottom ground contacts are connected
to chassis.
25 pin Sub-D connector terminal (SD25)

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NPPA-TT-SD25 Instruction Manual
Jumper Setting
Arrangement on PCB
(seen from mating side)
Chassis Common
Sub-D-Group Central
Sub-D-Group Chassis Top
Sub-D-Group Chassis Bottom
Grouping
PCB
(seen from front, removed jack pairs)
flexible foil
Bridge sleeve
It's also possible to bridge the sleeve contacts
of top and bottom row without grouping of
channels!
Grounding Variations
Note:
Phantom powered microphones
In general it is not recommended to run phantom power through patch panels.
In the case it is required to patch phantom powered microphones, all of the shields (SLEEVE contacts)
from this device must be tied together. This can be accomplished by grouping the grounds of these
channels via the PCB bus (using solder bridges). This group is then connected onto the general technical
ground. Because of the missing SLEEVE normalling contact it is necessary to wire internally the ground
(sleeve) contact of the top and bottom row of each channel. If this is critical with respect to possible
ground loops make the connections via patch cable instead of using the normalling feature.
Pin-Heade
r
Ground grouping
top row
Ground grouping
bottom row
Solder to
bridge sleeve
(phantom power)

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NPPA-TT-SD25 Instruction Manual
5. Wiring
12 Sub-D connectors with 25 pins each enable fast and easy wiring even with the patch panel
installed in the rack.
The pinout is equivalent to "Tascam DA-88 Analog I/O printout".
Rear front for wiring
6. Cable retention to the unit
The built in cable retention bar is at the back of the casing. Simply attach the cables with cable
ties to the bar.
For large and heavy bundles there is an additional strain relief bar NPPA-S available. It is
attached to the casing with four screws.
Cable retention bar

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NPPA-TT-SD25 Instruction Manual
7. Channel identification
The front panel is equipped with channel identification strips located in the center of the
channels and marked with the channel numbers 1-24 and 25-48 respectively.
For the perfect management of the system and for individual identification according to
customer’s needs there are two large and separate labeling strips, one for the bottom and one
for the top row.
To write on the paper you have to unscrew one of the outer fixing screws of the front panel.
Then pull out the side-stop, the transparent foil and the paper strip itself.
After marking is done assemble the parts in reversed sequence.
Remove labeling strip
Channel identification strips
Labeling strips
Side Stop

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NPPA-TT-SD25 Instruction Manual
For easy and perfect marking you can use our designation software “PatchLabel” which is
available on our web site www.neutrik.com free of charge.
Print-Out software “Patch Label”
8. Technical data
8.1 Electrical
Frequency range: DC to > 50 MHz
Digital suitability: Digital audio acc. to AES/EBU
Channel separation: > 100 dB @ 10 kHz, 600 Ωterminated
> 40 dB @ 6 MHz, 110 Ωterminated
Insulation resistance: > 10 GΩ@ 500 V dc
Connector contact resistance: < 20 mΩ
Switch contact resistance: < 25 mΩ
Dielectric strength: 1000 V dc
8.2 Mechanical
Lifetime: > 5.000 Insertion / withdrawal cycles
Insertion / Withdrawal force: < 10 N / > 8 N
Cable retention force: 70 N max per cable retention bar
Dimensions (rack mount): 482 mm (W) ×44 mm (H) (19” ×1 U)
Depth: 178 mm (7”)
Weight: 2.2 kg
Temperature range: -30° C to +80° C
8.3 Materials
Jack housing: PA 66 blend
Jack contacts: CuSn6 – TRIBOR®plated
(0.2 µm AuCo over 2 µm NiP)
Casing: Steel and aluminum, black coated
Front Panel: AlMgSi 0.5 F22

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NPPA-TT-SD25 Instruction Manual
9. Wiring Diagram
Exam
p
le channel 1 to 8, the other channels are identical.

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NPPA-TT-SD25 Instruction Manual
10. Ordering Information
10.1 Standard supply
The compact Neutrik "Easy Patch” NPPA-TT-SD25 consists of:
•Black coated steel casing with aluminum fittings
•2 x 48 highly integrated NJ3TTA jacks with gold plated double contacts and specially
designed normalling mechanism (standard: half normalled bottom row)
•Integrated internal pre-wiring with selectable flexible grounding system
•12 x 25 pin D-subminiature terminals
•1 built–in cable retention bar
•Spare normalling configuration bars
48 Normal 1: “short”, bridges 5 contacts
96 Normal 2: “medium”, bridges 6 contacts
48 Normal 3: “long” , bridges 7 contacts
•1 Disassembling pliers
•1 Instruction Manual
10.2 Options and Accessories
Order Information for Pre-configured jack pairs and Accessories:
•NJ3TTA-4-HNB blocks of 2 channels; half normalled bottom row
cover identification color: clear
•NJ3TTA-4-HNT blocks of 2 channels; half normalled top row
cover identification color: yellow
•NJ3TTA-4-FN blocks of 2 channels; full normalled
cover identification colour: green
•NJ3TTA-4-P blocks of 2 channels; parallel
cover identification color: red
•NJ3TTA-4-I blocks of 2 channels; isolated
cover identification color: orange
•NPPA-S optional Strain relief bar
•NKTT0x Patch cable (available in different lengths and colours)