Cisco Systems 870 Router User Manual


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
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







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–123(11)T
2811, 2821, and 2851–
123(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–123(11)T
2811, 2821, and 2851–
123(8)T
No reliance on other
network modules, WICs,
voice interface cards,
or advanced integration
modules
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