130 131
One-port Channelized
E1/T1 ISDN PRI Network
Module
Provides a single
channelized E1/T1 ISDN
PRI balanced (120 ohm)
or unbalanced (75 ohm)
connection
Serial and Legacy
Concentration
ISDN Concentration
3800 Series–123(11)T
2811, 2821, and 2851–
123(8)T
No reliance on other
network modules, WICs,
voice interface cards,
or advanced integration
modules
Cisco Channelized T1/E1 and ISDN
Network Modules
Two-port Channelized
E1/T1 ISDN PRI Network
Module
Provides a double
channelized E1/T1 ISDN
PRI balanced (120 ohm)
or unbalanced (75 ohm)
connection
Serial and Legacy
Concentration
ISDN Concentration
3800 Series–123(11)T
2811, 2821, and 2851–
123(8)T
No reliance on other
network modules, WICs,
voice interface cards,
or advanced integration
modules