Model 76 - Modular Card Cage
Reference Manual


Table of Contents

1.0 General Description
2.0 Detailed Description
3.0 Installation
4.0 Operation
5.0 Connector Pin Assignment
6.0 Help
Warranty



1.0 General Description

This manual describes the Series 76 Card Cage assemblies manufactured by TELEBYTE TECHNOLOGY, INC. Included in this manual are sections de-scribing the Model 76-1, 76-2, 76-3, 76-4, 76-6 and 76-7 Card Cages. Each Model 76 Card Cage includes a modular Power Supply Assembly, either the Model 76-A, 76-B, 76-C or 76-D Dual Redundant Supply, composed of two Model 76-E power sup-plies. These Card Cages are used to host a variety of modular components which include Asynchronous Short Haul Modems, Interface Converters and Synchronous Short Haul Modems.

NOTE: THE MODEL 76-1 IS NO LONGER MANUFACTURED.

2.0 Detailed Description

The Model 76-X is a standard rack mounted component either 5.25" or 7" high, 19" wide and 13" deep. It weighs approximately 13 lbs. with the power supply installed. The Models 76-4, 76-6 and 76-7 are 7" high.

Signal and power distribution is accomplished via a printed circuit backplane.

The Models 76-2/3/4/6 card cage accommodates 15 pluggable modules. One of these is the system power supply. The Model 76-A and 76-B power sup-plies develop semi-regulated DC voltages of approximately +18 and -18 Volts for distribution to the modules via the backplane.

Where necessary, Telebyte offers Card Cages with dual, redundant power supplies. When this option is exercised the Card Cage will only accommodate 12 plug-in modules. The option is identified as -DPS after the model number for the 76-2, 3, 4. The dual redundant version of the 76-6 is the 76-7. In ordinary operation both power supplies are on and share the load. If one of the supplies should fail the other automatically takes over.

The Model 76-C develops regulated voltages of +5, +12, -12 and an isolated 12 Volt source. The Model 76-D incorporates two Model 76-E power supply units, wired to form a redundant power supply system. The voltages developed are the same as those listed above for the Model 76-C.

Associated with each of the 14 module slots, 11 on the Model 76-7, are two RS-232 connectors and a grouping of eight receptacles which are designed to interface to two sets of the 4 wire lines (not on the 76-6 or -7). The Model 76-1 and 76-2 accept industry standard spade or lug terminals whose dimensions are .250 wide by .031 thick. A box of lug terminals is supplied with each card cage. The Model 76-3 accepts a 4 position connector which is supplied with the card cage. The Model 76-4 accepts a modular cable for each 4 wire line. The Models 76-6 and 76-7 have only two DB-25F connectors per slot position.

The RS-232 connectors support pins 2 and 3, TRANSMIT & RECEIVE DATA. On Models 76-1 and 76-2 pins 4 and 5 are connected together as are pins 6, 8, and 20. On the Models 76-3 and 76-4 pins 4, 5 and 6 are not connected, however, the lower RS-232 connector has pins, 4, 5, 6, 8, 15, 17, 20 and 24 wired to the module card connector.

The upper RS-232 connector supports pins 8 and 20. Pin 7, SIGNAL GROUND, is communed through to all the RS-232 connectors and common to power ground of the power supply module. Pin 1, FRAME GROUND, is un-terminated in the card cage.

The Models 76-6 and 76-7 provide support for all 25 pins of the DB-25 connectors. The utilization of the connector pins is a function of the card type being installed in the card cage.

Power input is via removable line cord and fused to support operation from 110 volts AC, 60 HZ, or 220 volts, 50 HZ. The selection of the operating input voltage to the power supply is determined by a switch on the Model 76-A/B power supply module. The Model 76-C and 76-D have moveable jumpers for changing the input voltage.

For Models 76-6 and 76-7 the connectors on the RS-232 connectors are a function of the module inserted into the slot.

3.0 Installation

3.1 Unpacking

Unpack the Model 76 Card Cage using caution in handling as the front door is fragile. Inspect the assembly for concealed damage. Should any damage be found please notify the carrier at once. The Power Supply is shipped in a separate box. It should also be inspected for damage.

3.2 Power Supply

Moving two black upper tabs on the LEXAN door inward, rotate the door outward and down. The Power Supply module should be installed in the rightmost position of the card cage when the cage is viewed from the front. The backplane connector for the power supply on Models 76-1/2/3/4 are keyed to only accept a Model 76-A/B Power Supply. The 76-A and 76-B slides into the module position. The 76-C is installed, via thumbscrews, into the Model 76-6 Card Cage from the rear. The 76-C contains an internal, pluggable, jumper which must be positioned to either 110 or 220 Volts. It is shipped in the 110 Volt position.

Care should be exercised when inserting the power supply into the card cage. Make sure that the POWER switch is off (in the out position for Models 76A and B). Plug the card cage into the AC source and depress the POWER pushbutton switch. The Power On LED should illuminate.

CAUTION: FOR MODELS 76A AND B KEEP HANDS AND OTHER ARTICLES AWAY FROM THE BACKPLANE AT THE REGION OF THE POWER SUPPLY CONNECTOR. THERE IS EXPOSED HIGH VOLTAGE IN THIS AREA.

For dual power supply version repeat the above installing the second power supply.

3.2.1 MODEL 76-2DPS-308

As the colors of the cores in the mains lead of this equipment may not correspond with the colored markings identifying the terminals in your plug, proceed as follows:

The core which is colored green and yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol, or colored green or yellow.

The core which is colored blue must be connected to the terminal which is marked with the letter N or colored black.

The core which is colored brown must be connected to the terminal which is marked with the letter L or colored red.

3.3 I/O Interface-Models 76-1 and 76-2

After performing the visual inspection of the card cage it will be observed that each module position has two RS-232 connectors. These are termed A and B. The upper RS-232 connector is associated with the B Channel whereas the lower RS-232 connector is associated with the A Channel.

When viewed from the rear of the card cage the reader will see a number and a line (to the left of the number) below each group of connectors. These numbers refer to the module position in the card cage. Directly above each number is a column of SPADE LUG receptacles. The two twisted pairs for each channel should be connected to the proper LUG receptacles. A box of spade terminals has been included with the card cage for this purpose. The Telebyte part number for these terminals is 3035-0017. Ideally the wires should be crimped; if, however, a crimping tool is not available the terminals should be soldered. The terminal arrangement is the same as the RS-232 connectors, i.e., the upper four receptacles are associated with Channel B whereas the lower four receptacles are associated with Channel A.

NOTE: UPPER CONNECTORS ARE FOR THE B CHANNEL ONLY. LOWER CONNECTORS ARE FOR THE A CHANNEL ONLY.

The arrangement of the spade terminal receptacles is shown below.

R- X Channel B
R+ X
T+ X
T- X
R- X Channel A
R+ X
T+ X
T- X

3.4 I/O Interface-Model 76-3/4

The Model 76-3 Interface is similar to that described above, however A Channel connectors are above B Channel connectors. The connections to the 4 wire lines uses an insulation displacement connector and connector cover which are included with the card cage. These connectors are designed to interface to 22 or 24 gauge, standard wire. A tool is provided for the installation of the wires.

The Telebyte P/N for the 4-position connector is 3105-0027 and the P/N for the cover is 3110-0033. The installation tool is 4105-0001.

The wiring of the 4-position connectors is shown below.

FOR MODEL 85 ONLY
R+ X Channel A R+ X
R- X R- X
T- X T+ X
T+ X T- X
R+ X Channel B R+ X
R- X R- X
T- X T+ X
T+ X T- X

The Model 76-4 uses a separate RJ-11, 6 position, -4 wire, modular receptacles for each of the 4 wire lines coming from the remote modem. The wiring for these connectors is shown below.

Note: Model 76-4-166
The 76-4-166 is a 76-4 Card Cage modified to have redundant power supplies. The addition of the second power supply reduces the number of slots for dual card modems from 14 to 11.

Note: Model 76-4-167
The 76-4-167 is a Card Cage modified to have redundant power supplies, RJ-11 connectors reconfigured to a Telco style layout, and no connection between the A and B modems on any card.


The addition of the second power supply reduces the number of slots for dual card modems from 14 to 11.

The re-configuration of the RJ-11 connectors have changed from the layout as shown in the previous figure to a configuration as shown below. The disconnection of the A and B modems disables the ability to use a synchronous card in this cage.


NOTE: When the Model 79 is used in the 76-3 the backplane designation for T+ becomes T- and T- becomes T+.

3.5 I/O Interface-Model 76-6 & 76-7

The Model 76-6/7 Interface is two RS-232 connectors. Since these connectors also plug into the module the connections are determined by the module.

3.6 Cable Interface
3.6.1 Digital Interface

The digital interface for all Card Cages is a female DB25 type, industry standard, 25 pin connector. Any device such as a computer, terminal or printer may be connected via a cable that terminates at the backplane with a DB25 male connector.

3.6.2 Analog Interface
(Does not apply to Model 76-6 or 76-7)

The analog interface requires two twisted pairs per modem channel for proper full duplex of half-duplex operation. Simplex operation (one way only) requires only one twisted pair. Cables should be high quality and at least 24 gauge stranded twisted pair and color coded to facilitate installation and repair. Solid conductor wire should not be used on long distances at data rates over 1200 Baud. When installation involves electrically noisy environments an outside shield is recommended. Connect as shown below.


4.0 Operation

4.1 Model 76-A/B/C Power Supply

The Model 76-A/B Power Supply incorporates a push-push switch while the 76-C/E incorporates an illuminated rocker for POWER ON. Depressing this switch turns on power and causes the POWER LED to illuminate. The power supply also has a LAMP TEST momentary pushbutton switch. When depressed a common bus on the backplane will switch from ground to approximately +14 Volts DC. Any module installed in the card cage will sense this voltage change and cause all of its front panel LED's to illuminate.

The Model 76A and B power supply has an internal slide switch which selects the input voltage range, 115 or 230, that the power supply will operate from. This switch should be set to the proper position before the unit is turned on. The Model 76-C and E has an internal jumper for setting the input voltage.

CAUTION: SET INPUT VOLTAGE SELECTOR SWITCH JUMPER BEFORE PROCEEDING.

4.2 Model 76-A Power Supply
(No longer manufactured, for info only)

This unit is used to power up to 14 Model 75 or 85 Short Haul Modems or up to eight Model 78 Current Loop Converter Modules or eight Model 79 Dual Short Haul Modems with Handshake.

4.3 Model 76-B Power Supply

The Model 76-B has additional power capability to supply an entire card cage of all available modules designed for each respective cage.

5.0 Connector Pin Assignment

5.1 Backplane

5.1.1 AC Power (All expect 76-6/7)

The backplane contains three lug terminal receptacles on the extreme left side when viewed from the rear. The upper lug is FRAME (EARTH) GROUND. The next two lugs are the line connections for the AC input and are labeled L1 and L2.

CAUTION: THE AC TERMINAL RECEPTACLES ON THE BACKPLANE CARRY HIGH VOLTAGE. THE USER IS CAUTIONED ABOUT THE POTENTIAL SHOCK HAZARD. KEEP HANDS AND TOOLS AWAY FROM THESE POINTS.

The backplane of the card cages are equipped with the facility of grounding Signal Ground to Power Ground. The card cages are shipped without the grounds tied together. If the systems wiring requires this connection it may be installed by adding a short piece of wire with a lug on each end between the Power Ground lug receptacles on the left side of the backplane.

When using Model 83 Short Haul Modems it is recommended that the jumper between Power Ground and Frame Ground be installed.

5.1.2 RS-232 Connectors

The Model 76-1 Card Cage (no longer manufactured) is a reduced capacity version of the Model 76-2 in that it only provides the capability of supporting eight modules of the Model 75 Dual Short Haul Modem. The Model 76-1 is no longer available.

For the 76-1 and 76-2 the upper row of RS-232 connectors is the B channel whereas the lower RS-232 connectors are the A channel. To the right of each column of RS-232 connectors is a column of lug terminal receptacles. There are two groups of four to allow terminating the two sets of twisted pairs required for the two modems in a Model 75. The upper four receptacles are for the B channel whereas the lower four receptacles are for the A channel.

5.2 Power Supply

The power supply connections are not normally of concern to the user since he does not interface with them; they are provided here for reference purposes only.

76-A/B
A +18VDC OUT 1 +18VDC OUT
B GROUND 2 GROUND
C -18VDC OUT 3 -18VDC OUT
D LAMP TEST BUS 4 FUTURE EXP BUS
E GROUND 5 GROUND
F NC 6 NC
H NC 7 NC
J NC 8 NC
K AC INPUT 1 9 AC INPUT 2
L AC INPUT 1 10 AC INPUT 2

76-C/E
9 9 LAMP TEST
8 8 GROUND
7 -12
6 GROUND
5 +12
4 +5
3 +12 ISOLATED
2 NOT USED
1 -12 ISOLATED

5.3 Backplane Module Interface
Models 76-1 and 76-2

The backplane module interface is not normally the concern of the user since he does not directly interface with it; the information is provided here as a reference for future service.

A +18VDC INPUT 1 +18 VDC INPUT
B GROUND 2 GROUND
C -18VDC INPUT 3 -18VDC INPUT
D LAMP TEST BUS INPUT 4 FUT EXP INPUT
E TRANSMIT DATA IN A 5 REC DATA IN A
F TRANSMIT DATA IN B 6 REC DATA IN B
H R+ IN CHANNEL B 7 R- IN CHANNEL B
K R+ IN CHANNEL A 9 R- IN CHANNEL A
L T- OUT CHANNEL A 10 T+ OUT CHAN A

5.4 Backplane Module Interface
Models 76-3 and 76-4

The backplane module interface is not normally the concern of the user since he does not directly interface with it, the information is provided here as a reference.

L=Lower
U=Upper

LT+ 15 S LT-
LR- 14 R LR+
UT+ 13 P UT-
UR- 12 N UR+
U8 11 M U20
U3 10 L U2
L24 9 K L8
L20 8 J L6
L5 7 H L17
L4 6 F L3
L15 5 E L2
(BUS)SPARE 4 D LT(LAMP TEST)
-V 3 C -V
GND 2 B GND
+V 1 A +V

5.5 Backplane Module Interface
Model 76-6/7

The backplane module interface is not normally the concern of the user since he does not directly interface with it, the information is provided here as a reference.

GND 6 F LAMP TEST
-12 5 E -12
GND 4 D GND
+12 3 C +12
+5 2 B +5
+VI 1 A +VI

6.0 Help

If any assistance is required please visit our  Technical Support Center.
 

Warranty

Telebyte warrants the equipment to be free from defects in material and workmanship, under normal and proper use and in its unmodified condition, for 12 months, starting on the date it is delivered for use. TELEBYTE's sole obligation under this warranty shall be to furnish parts and labor for the repair or replacement of products found by TELEBYTE to be defective in material or workmanship during the warranty period. Warranty repairs will be performed at the point of manufacture. Equipment approved for return for warranty service shall be returned F.O.B. TELEBYTE factory and will be redelivered by TELEBYTE freight prepaid, except for non- continental U.S.A. locations. These deliveries will be sent COD freight and import/export charges.

THE ABOVE WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, STATUTORY OR OTHERWISE, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TELEBYTE SHALL NOT BE LIABLE FOR ANY DAMAGES SUSTAINED BY RESELLER OR ANY OTHER PARTY ARISING FROM OR RELATING TO ANY EQUIPMENT FAILURE, INCLUDING, BUT NOT LIMITED TO CONSEQUENTIAL DAMAGES NOR SHALL TELEBYTE HAVE ANY LIABILITY FOR DELAYS IN REPLACEMENT OR REPAIR OF EQUIPMENT.

Out of warranty equipment may be returned to the Greenlawn, NY customer service facility prepaid as described above. Return shipping charges will be billed to the customer. The repaired unit will have a 90 day warranty. In those cases where "NO TROUBLE" is found, a reduced charge will be billed to cover handling, testing and packaging.

Whether in or out of warranty a Return Material Authorization number (RMA) is necessary
and can be obtained by visiting our Technical Support Center. Reference RMA number on the outside container.

Document No. 0315-0023/Rev. J

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