Specifications

Excalibur Multirate DAP Installation and Operation
3-22
Aggregate Transition Board Headers
The RS-232 Aggregate transition board has four headers, labeled X1 to X4, that come
from the factory set as follows. Do NOT change these settings.
Header Setting
Selection
X1 Out Not Used
X2 In Single Port
X3 Out Not Used
X4 In Single Port
The V.35 Aggregate transition board has six headers, labeled X1 to X6, that come from
the factory set as follows. Do NOT change these settings.
Header Setting
Selection
X1 Out Not Used
X2 In Single Port
X3 Out Not Used
X4 In Single Port
X5 Out Clear Secondary Channel
X6 In CMS
Digital Bridge Board
Central site versions of the Excalibur Multirate DAD operate with a Digital Bridge Board
(DBB). The DBB is a special transition board designed for the DAD and the EDRS Dial
Backup Resource (DBR). Two types of DBB are available: RS-232 and V.35. The
DBB plugs into the back of the Excalibur Card Carrier.
Switch and Header Settings
Each DBB has a 4-position switchbank, labeled S1, and four header sockets, labeled X3
to X6, that are preset to operate with the type of unit it is shipped with: singleport DAD,
multiport DAD, or DBR. Before you install the DBBs for the singleport DADs, verify
that these switches and headers are set as follows:
• Switchbank S1, Switches 1 to 4 should all be set On.
• Headers should be installed in the X3 and X5 sockets. Sockets X4 and X6
should be empty.
Figure 3-9 shows the locations of the switchbank and headers.