INSTRUCTION MANUAL
NPPA-TT-SD25
PATCH PANEL “Easy Patch” | 96 Bantam (TT) Jacks, 25 pin
D-subminiature

NEUTRIK AGNEUTRIK Zürich AG
Liechtenstein
Switzerland
Tel.: +423/237 24 24 Tel.: +41 44/736 5010
Fax: +423/232 53 93 Fax: +41 44/736 5011
www.neutrik.com
Draft. Nr.:
Update:NEUTRIK (UK) Ltd.
NEUTRIK USA INC.
Great Britain
USATel.: +44 1983/811 441 Tel.: +1 732/901 9488
Fax: +44 1983/811 439 Fax: +1 732/901 9608

BDA20617.01.2008

Data subject to change without prior notice. ©2007 NEUTRIK . ALL RIGHTS RESERVED.

NEUTRIK Tokyo Ltd.
Japan
Tel.: +81 3/3663 4733
Fax: +81 3/3663 4796

NEUTRIK France
NEUTRIK Vertriebs GmbHFranceGermany/Netherlands/Austria
Tel.: +33 1/4131 6750 Tel.: +49 8131/28 08 90
Fax: +33 1/4131 0511 Fax: +49 8131/28 08-30

NPPA-TT-SD25 Instruction ManualIndex
1. Electrical configuration.................................................................................................3
2. Replacement of Jack Pairs ..........................................................................................4
3. Reconfiguration by hand..............................................................................................5
4. Grounding variations ...................................................................................................7
5. Wiring ..........................................................................................................................86. Cable retention to the unit............................................................................................9
7. Channel identification ................................................................................................10
8. Technical data ...........................................................................................................119. Wiring Diagram..........................................................................................................12
10. Ordering Information................................................................................................13

Dimensional Drawing NPPA-TT-SD25

Front panel
Cable retention bar
Top coverPage 2 of 13NPPA-TT-SD25 Instruction Manual1. Electrical configuration
The Neutrik ”Easy Patch” is fitted with high quality, long life NJ3TTA double contact jacks (2 x48) 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 Uhigh) 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 anddigital audio signals.
The new generation of the Neutrik ”Easy Patch” is easily programmable for any out of fiveelectrical 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 pairwith 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) withprefabricated 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 consistingof two “Plug-in Units”.

Module consisting of 2 Jack Pairs

Remove Front Panel by unscrewing the 3 black cross-recessedscrews (M3x8 Taptite), remove the two side-stops.

Push out the channel identification strips.

Pull one module out of the casing using the supplieddisassembling 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 sothat the thicker body marked “left” is put on the left side withthe mark outside and readable.

To complete, push the new jack pairs into the casing again with the mark on the left side (Ifmore than one module are removed always assemble from the center to the right or left sideand be careful that the keys on the left side of the jack pairs find their guiding slots. If all jackpairs are removed start at the casing support in the center and assemble to the right and leftside). Slide in again the channel identification strips (best from the outside inwards) and fix thefront 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 ofnormalling bars.

The two jack pairs are separated by spreading apart the rearparts 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 bothends.
Attention: To ensure best contact conditions never reuse theconfiguration bars once being put in place! Always take new
ones! Keep the contacts and switches in place with the thumbwhile manipulating the normalling contacts.

Finally snap on the cover (Insert it first at one side and thensnap 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-DGroup 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 systemprovides the following alternatives to choose from:•Chassis Common:

All channel grounds (top & bottom row) areconnected via PCB and jumpers to the patch panelchassis.

•Sub-D-Group-Central:

Ground contacts of top and bottom row areconnected but separated from chassis.

•Sub-D-Group-Chassis Top or Bottom: Either top or bottom ground contacts are connectedto chassis.

25 pin Sub-D connector terminal (SD25)

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NPPA-TT-SD25 Instruction ManualJumper SettingGrouping

Arrangement on PCB(seen from mating side)

PCB(seen from front, removed jack pairs)

Pin-Header

Ground grouping
top row

Solder tobridge sleeve(phantom power)

Chassis Common

flexible foil

Ground grouping
bottom row

Sub-D-Group Central
Bridge sleeve
Sub-D-Group Chassis Top
Sub-D-Group Chassis Bottom

It's also possible to bridge the sleeve contactsof top and bottom row without grouping ofchannels!

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 thesechannels via the PCB bus (using solder bridges). This group is then connected onto the general technicalground. 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.

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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 cableties to the bar.
For large and heavy bundles there is an additional strain relief bar NPPA-S available. It isattached 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 thechannels and marked with the channel numbers 1-24 and 25-48 respectively.

Channel identification strips
Labeling strips

For the perfect management of the system and for individual identification according tocustomer’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.

Side Stop

Remove labeling strip

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NPPA-TT-SD25 Instruction ManualFor easy and perfect marking you can use our designation software “PatchLabel” which isavailable on our web site www.neutrik.com free of charge.

Print-Out software “Patch Label”

8. Technical data
8.1 ElectricalFrequency range:
Digital suitability:
Channel separation:
Insulation resistance:
Connector contact resistance:
Switch contact resistance:
Dielectric strength:

DC to > 50 MHz
Digital audio acc. to AES/EBU> 100 dB @ 10 kHz, 600 Ω terminated> 40 dB @ 6 MHz, 110 Ω terminated> 10 GΩ @ 500 V dc
< 20 mΩ< 25 mΩ1000 V dc

8.2 Mechanical
Lifetime:
Insertion / Withdrawal force:
Cable retention force:
Dimensions (rack mount):
Depth:
Weight:Temperature range:> 5.000 Insertion / withdrawal cycles< 10 N / > 8 N
70 N max per cable retention bar
482 mm (W) × 44 mm (H) (19” × 1 U)
178 mm (7”)
2.2 kg-30° C to +80° C

8.3 Materials
Jack housing:Jack contacts:
Casing:Front Panel:

PA 66 blend
CuSn6 – TRIBOR® plated(0.2 µm AuCo over 2 µm NiP)
Steel and aluminum, black coated
AlMgSi 0.5 F22

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NPPA-TT-SD25 Instruction Manual

Example channel 1 to 8, the other channels are identical.

9. Wiring Diagram

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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 speciallydesigned 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 barSpare 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•

NKTT0xPatch cable (available in different lengths and colours)

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