Applications
GARD 8000 SYS RFL Electronics
May 1, 2013 2-21 973.334.3100
A dual auxiliary channel module intended for creating up to two asynchronous RS-232 data
connections across another GARD 8000 communications interface. The two ports can be used
completely independently at any baud rate using one 64 kbps timeslot per port. If desired, both ports
can use a single timeslot when both heads are running at 19.2 kbps or below. The data is converted
from async to sync in compliance with V.14. The synchronous data is then transmitted to the far end
using V.110 framing. The head is always seen as an Aux Channel, providing a point to point link over
a higher speed GARD link. The module has two female D-sub 9 connectors.
2.5.3 RS-449, X.21, AND V.35
One common board is used for RS-449, X.21 or V.35 communications. The connector is a type DB37,
male. The choice of protocol is made on the Communications System Configuration web page.
The communication bandwidth can be set to 56 kbps single channel or 64 kbps for each channel
(1 through 12). Only use framing if the number of channels is greater than one and more than one
function is specified on the timeslot page for that comms head. For example, if two 64 kbps data
channels are to be used the data rate at the GARD is 128 kbps, and at the customer interfaced
equipment it is 192 kbps. Framing is required so that each individual channel can be identified, when
more than one channel is used.
2.5.4 G.703 CO-DIRECTIONAL
The G.703 co-directional communications interface uses one 64 kbps channel. The connector is a
DB15, male.
2.5.5 C37.94 SHORT HAUL FIBER
The short-haul fiber communications interface uses ST connectors and is intended for multimode
fibers up to 1 km (0.6 miles) in length.
The communication bandwidth is 64 kbps for each channel (1 through 12). Only use framing if the
number of channels is greater than one and more than one function is specified on the timeslot page for
that comms head. For example, if two 64 kbps data channels are to be used the data rate at the GARD
is 128 kbps, and at the customer interfaced equipment it is 192 kbps (‘n’ value of 3 for C37.94
interface). Framing is only available up to 11 timeslots for the C.37.94 interface. Framing is required
so that each individual channel can be identified, when more than one channel is used.
2.5.6 FIBER INTERFACES
There are 3 versions of fiber interfaces:
1300 nm LED for single mode or multimode fiber; typically up to 27 km (17 miles) with single
mode fiber.
1300 nm LASER, typically up to 59 km (37 miles) with single mode fiber.
1550 nm LASER, typically up to 90 km (56 miles) with single mode fiber.
All fiber interface versions are equipped with ST connectors.
The communication bandwidth is 64 kbps for each channel (1 through 12). Only use framing if the
number of channels is greater than one and more than one function is specified on the timeslot page for
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