Applications
GARD 8000 SYS RFL Electronics
May 1, 2013 2-19 973.334.3100
The Communication System Configuration settings include:
Line Interface. Configures type of communications of the module.
Line rate. 56 kbps, 64 – 768 kbps depending on type per interface.
o T1 will default the Line rate at 1.544 Mbps
o E1 will default the Line rate at 2.048 Mbps
o RS-232 Async Unit, two ports independently configured using one 64 kbps timeslot per
port, or share a single timeslot running at 19.2 kbps or below
o RS-449, X.21 and V.35 can be configured with data rates of 56 kbps, 64 kbps - 768
kbps
GARD 8000 Comms Subsystem. GARD 8000 has two 12 x 64 kbps internal comms buses and
the physical comms interface can be selected to use either of these two buses.
GARD 8000 Clock mode. Each internal bus needs one Master timing source provided via a
comms interface.
Timing. Timing source can be selected to be internal or loop (external). If this is configured for
internal the module will provide the communications clock. If configured for loop the module
will rely on an external clock source, a T1/E1 multiplexer or SONET/SDH system for example.
Framing. Defines the T1 or E1 framing protocol used. The protocols are:
o T1
SF - Super Frame
ESF - Extended Super Frame
o E1
CCS - Common Channel Signaling
Coding. Defines the T1 or E1 coding protocol used. The protocols are:
o AMI: T1/E1. Alternate Mark Inversion format represents a digital 1 as a square wave
and a digital 0 as a straight line. AMI is a bipolar format, each pulse alternates between
positive and negative polarity. Consecutive pulses of the same polarity constitute a Bi-
polar violation (BPV) and the signal is no longer valid.
o B8ZS: T1. Bipolar with 8-Zero Substitution uses intentional Bi-polar violations to
break up long strings of zeros. Any string of eight consecutive zeros is replaced with 2
intentional bi-polar violations before being transmitted.
o HDB3: E1. High Density Bipolar of Order 3. An excessive string of consecutive zeros
(>3) is replaced by a special code containing deliberate Bipolar Violations (BPV).
Line Build Out. Line build out on T1 and E1 interfaces adjusts the output characteristics of the
interface to match impedance characteristics of the cable. This is done by selecting either the
distance between the GARD 8000 chassis and the communications equipment, selecting a
desired attenuation level in dB or matching the output impedance for coaxial or twisted pair
cables. Setting the line build out for the distance from the GARD 8000 chassis to the
communications equipment will be sufficient for most applications.
TX/RX Clock Polarity. Defines the clock polarity of the RS-449/X.21/V.35 comms interface.
This can be set for (TX/RX):
o NORM / NORM
o NORM / INVERT
o INVERT / NORM
o INVERT / INVERT
2.5.1 T1/E1 AND E1 BNC
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