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Installation Guidelines
Revised April 2000 DBS-EX23-530 2-3
Guidelines
Read the following guidelines before beginning ISDN installation.
Installation instructions begin on page 2-14.
Hardware Requirements
• The system configuration determines what cards and cables must be
purchased for ISDN. See “DBS Equipment” on page 1-8 for more
information.
• The installer must provide a Channel Service Unit (CSU) that complies
with FCC Part 15 and Part 68. The CSU is installed between the DBS and
the public network. The CSU provides alarm, diagnostic, and monitoring
functions, as well as network protection.
See “CSU Equipment” on page 1-9 for details on purchasing CSUs.
Maximums
• One ISDN card can be installed per cabinet; the ISDN card must be
installed in the “EC/TRK” slot.
• The number of ISDN cards that can be installed in two-cabinet systems
depends on the sizes of the connected systems. Table 2-1 shows ISDN
maximums for two-cabinet systems.
Note: The DBS 72 + DBS 40 combination does not support ISDN.
Table 2-1. EC/TRK slot usage for ISDN
System Size EC/TRK Slot
Usage for ISDN
Master Slave
DBS 40 + DBS 40 No Yes
DBS 72 + DBS 40 No No
DBS 72 + DBS 72 No Yes
DBS 96 + DBS 40 Yes Yes
DBS 96 + DBS 72 Yes Yes
DBS 96 + DBS 96 Yes Yes