Vanguard Managed Solutions Vanguard 6500 PLUS - Manual (Page 25)

About the 6500
PLUS
1-17
Hardware
6500 PLUS Integral DSU
Introduction The 6500 PLUS Integral DSU option is intended for use in installations
requiring connection to a DDS interface, conforming to AT&T 62310 or ANSI
T1E1.4/91-006, and running at a rate of 56 kbps. At present, this optional DSU
interface is only available with VanguardMS 6500
PLUS enclosures using a 25-pin D
connector interface.
The DSU option normally uses clocking derived from the network interface, but may
also be configured to originate the clocking, thus providing the standard DSU and
CSU loopbacks. Installation of the DSU option requires a hardware and software
upgrade to the base 6500
PLUS product.
Hardware
Components The DSU option consists of two hardware modules, the Data Interface Module
(DIM) and the External Interface Module (EIM).
DIM The DSU DIM is a small (approximately 1 in. x 3.5 in.) circuit card installed as a
daughtercard onto the 6500
PLUS processor card. The DIM module provides the
proper power to the EIM and also performs the data translation functions.
EIM The EIM, shown in Figure 1-7, contains the telco interface circuitry portion of the
option.The EIM has an 18 in. cable with a 25-pin connection for interface with the
6500
PLUS unit, and an RJ-48S jack for connection to the DDS line.
Example of an EIM Figure 1-7 shows the EIM.
Figure 1-7. External Interface Module (EIM)
DSU Interface The DIM and EIM modules work cooperatively to provide a DSU interface and must
be installed together for proper operation. These devices are only intended for use
with VanguardMS 6500
PLUS equipment.
DB25 Connector
18-inch Cable
RJ-48S Jack