Polycom DOC2237A - Manual (Page 103)

MGC Hardware and Installation Manual
4-31
Net-2/Net-4/Net-8/Net-8L ISDN and Net-2/Net-4/Net-8 T1-CAS
Network Interface Module
The Net-2/Net-4/Net-8/Net-8L ISDN Network Interface module provides the
interface between the MGC unit and the ISDN network. The Net-2/Net-4/
Net-8 T1-CAS Network Interface module provides the interface between the
MGC unit and T1-CAS lines.
The Net-2/Net-4/Net-8 card connects to the IO-2, IO-4, and IO-8 cards
respectively. The IO-8 card contains connections of up to eight PRI spans, of
either an E1 or T1 line and it can work with both types simultaneously. When
the Net-2/Net-4/Net-8 card is used for T1-CAS lines, only T1 spans are
connected to the IO card.
Different types of ISDN and T1-CAS Network Interface Modules can be
installed. For more details, see “MGC Functional Modules Description” on
page 4-23.
The module’s front panel includes two, four or eight tri-color LEDs
(depending on the card’s configuration). Depending on the states of the LEDs
inputs, the LED can be off, green, red or yellow. The red and yellow states
indicate alarms.
The same type of card can be used to connect ISDN lines or T1-CAS lines.
However, you cannot connect ISDN lines and T1-CAS lines to the same network
card.
Stby
Fail
Active
Line 1
Line 2
NET-2
Stby
Fail
Active
Line 2
Line 3
Line 4
Line 1
NET-4
Stby
Fail
Active
Line 6
Line 7
Line 8
Line 3
Line 4
Line 5
Line 1
Line 2
NET-8