DESCRIPTION

The Cisco E1/T1 ISDN PRI Network Module's integrated channel service unit (CSU) provides direct connection to the telecommunications network, thus allowing customers to consolidate customer premises equipment (CPE). This provides multifunction dial access aggregation, routing functionality, VPN and firewall security, and other capabilities right inside the Cisco router in power branch office environments. Both the 1-port and 2-port versions offer support for balanced and unbalanced E1 connectivity and conform easily to customers' specific applications. The Cisco E1/T1 ISDN PRI Network Modules also supply connectivity for internal digital modems.

PRODUCT FEATURES

• Enhanced flexibility
  The Cisco E1/T1 ISDN PRI network module (NM-xCE1T1-PRI) is software configurable between E1 or T1 operation, balanced or unbalanced E1 termination, and CSU/DSU. In addition, the same modules provide for balanced (120-ohm) and unbalanced (75-ohm) E1 termination.
• Support for G.703 unstructured E1 signaling
  International Telecommunications Union (ITU) signaling standard G.703 was previously available only on Cisco midrange routers through the VWIC-xFT-G.703 voice/WAN interface card, which did not support data PRI.
• Increased manageability and troubleshooting
  Critical loop back support makes the Cisco E1/T1 ISDN PRI network module easy to manage. The Cisco E1/T1 ISDN PRI network module has the capability to internally loop back the on-board framer chip towards the interface.
• Reliability
  Integrating the external E1/T1 terminating device (CSU/DSU) increases the overall system reliability. Possible points of failure are reduced by eliminating the power supply, additional fans, extra cabling, and other equipment that accompany a "two-box" solution.