the external E1/T1 terminating device (CSU/DSU)

Integrating the external E1/T1 terminating device (CSU/DSU) increases the overall system reliability. Possible points of failure are reduced by eliminating the second power supply, additional fans, extra cabling, and other equipment that accompany a "two-box" solution. This increase in reliability allows service providers to more easily and cost-effectively meet the requirements of their customers' service-level agreements (SLAs) and provides utilities with maximum equipment uptime.

Platform Support

Refer to the software release notes or the Cisco IOS Software Upgrade Planner, or ask your local Cisco representative for information about minimum software and memory requirements. Table 1 shows the minimum Cisco IOS Software requirements for each platform.

Table 1. Minimum Cisco IOS Software Requirements

	Cisco CGR 2010
Minimum IOS Release	15.1(1)T
Minimum IOS Technology Package	IP Base

Table 2 shows the platform support and maximum number of Cisco Channelized T1/E1 and ISDN PRI Modules supported in each platform.

Table 2. Number of Cisco Channelized T1/E1 and ISDN PRI Modules per Platform

Type of Module	Cisco CGR 2010
1 port T1/E1 GRWIC	4
2 port T1/E1 GRWIC	4

Software and Management Features

Table 3 shows the number of DS-0 channels supported by Cisco Channelized T1/E1 and ISDN PRI GRWICs and Network Module. Each port can support up to 24 channels for T1 and 31 channels for E1.