Specifications
The RJA Series are low cost, high reliability, passive Matrices that are designed for analog voice
and digital communication applications. Two, four or six pins on RJ12 Jacks are switched using
reed relays. Each mainframe holds power supplies, a Control Module, up to 16 Switch Modules
and CL8 Display Modules. CL8 Modules control the switch module and show switch status.
RJA SERIES HIGH RELIABILITY MATRICES
RJA/128 MAINFRAMES
This unit furnishes two independent 16x4 matrices when filled
with 16 RJ/2(1x4) Switch Modules as shown in Fig. 1 on the
second page of this bulletin. Bandpass is DC to 30 MHz, and
Crosstalk is less than -60dB at 5 MHz.
RJA/16x8 MAINFRAME
This chassis holds 16 RJ/2(1x4) Switch Modules jumpered as
1x8s to form a 16x8 Matrix. Bandpass is DC to 25 MHz with
Crosstalk less than -60dB at 1 MHz.
Bussing together the four output pairs (0A & 0B, 1A & 1B, etc.)
of the two 16x4 matrices shown in Fig. 2 on the second page of
this bulletin creates a single 32x4 matrix with a Bandpass from
DC to 20 MHz and Crosstalk less than -60dB at 1 MHz.
RJ SWITCH MODULES
Each RJ Series Switch Module is built with eight Type S
Standard or Type M Mercury Reed Relays and two RJ12
Jacks. Either 2, 4 or 6 poles are switched. Each module
provides two 1x4 matrices as shown in Fig. 9, with optional
jumpers creating a 1x8 configuration.
RJ/2(1x4)-2 SWITCH MODULE
Eight 2 pole relays switch the inner pins on the RJ12 connec-
tors, and the outer four pins are wired as shields.
Similar to the above, this is built with 4 pole relays. The RJ12's
inner four pins carry signals while the outer two are shields.
RJ/2(1x4)-6 SWITCH MODULE
Fig. 9
01234567
A
B
RJ/2(1x4)-4 SWITCH MODULE
RJX SERIES HIGH RELIABILITY MULTIPLEXERS
RJX/8x1-ISO SWITCH MODULES
This module has eight, 4 or 8 pole Type S Reed Relays ar-
ranged in a 4x2 configuration. The Bandpass at -1dB is 80
MHz and Crosstalk is -40dB at 10 MHz.
RJX/32 MAINFRAME
This unit is 3.5" high and accepts up to four RJX Switch Mod-
ules. It can be configured as either a 32x1 Multiplexer or 16x2
Matrix. Bandpass as a 32x1 Multiplexer is -3dB at 35 MHz,
and Crosstalk is -40dB at 10 MHz.
RJX/128 MAINFRAME
This unit is 8.75" high and accepts up to 16 RJX Switch Mod-
ules and 16 Display Modules. Many different configurations
are possible, ranging from sixteen individual 1x8 multiplexers
up to either a 128x1 multiplexer or a 64x2 matrix. Bandpass
as a 128x1 mux is DC to 15 MHz at -3dB and Crosstalk is -
30dB at 10 MHz.
This module has eight, 4 or 8 pole Type S Standard Dry Reed
Relays arranged as an 8x1 multiplexer as shown in Fig. 10.
Bandpass is 80 MHz at -1dB and Crosstalk is -40dB at 10
MHz.
One CL8 Display Module is required for each Switch Module
only in the RJX/128 Mainframe.
RJX/4x2-ISO SWITCH MODULES
These are 19" rack mounting chassis, 3.5" high and 12"
deep. Signal connectors are RJ12 Telco Jacks. Three dif-
ferent matrices are offered.
RJA/32x4 MAINFRAME
This uses 6 pole relays and switches all pins on the RJ12s. It is
not available with Type M relays.
CL8 DISPLAY MODULES
0123
4567
COM
BACKPLANE
Fig. 10
One Display Module is required for each RJA Switch Module.
CL8 DISPLAY MODULES
RJA/128 EXPANSION CHASSIS
These chassis are the same as above but are powered and
controlled via a MESA Control Chassis as detailed in the
MESA Bulletin.
RJA/2(16x4) MAINFRAME
The RJX Series are low cost, passive Multiplexers. These systems are designed to switch communica-
tions signals such as analog voice and 10Base-T Ethernet. Signal connectors are RJ45 Jacks, and both
four and eight pole modules are available. The four wire versions switch Pins, 1, 2, 3 and 6 of the RJ45s.
Each Mainframe is built with power supplies, a Control Module and prewired motherboards that hold the
RJX Switch Modules. A full LED Display is included.
RJ-5