Cisco C3725 Dial Bdl 4xBRI ST 1E2W 12DM IP IOS 3725MBUNDLE-4B-S/T Data Sheet

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Cisco 3700 Series routers, installed with digital modem network modules and PRI/BRI interfaces, offer the most

flexible, scalable, manageable, and high-performance dial-access solutions available in the market today.

Cisco 3700 Series PRI modem bundles use either a one- or two-port PRI network module in combination with digital

modem network modules to offer support for up to 60 remote modem users at speeds of up to 56 Kbps. The Cisco

3700 PRI bundles support 24, 30, 48, or 60 integrated digital modems. Additional WICs and AIMs can be ordered

to increase performance. The benefits of these bundles include ease of ordering (only one SKU), the ability to support

remote users at the maximum connection speeds available, and the inclusion of feature-rich Cisco IOS Software.

Cisco 3725 BRI bundles use either a four- or eight-port BRI network module together with a digital modem network

module to provide connectivity for up to 16 concurrent remote users. Additional WICs and AIMs can be ordered to

increase performance. The benefits of this bundle include ease of ordering (only one SKU), the ability to support

remote users at the maximum connection speeds available, and the inclusion of the feature-rich Cisco IOS Software.

Cisco 3700 Series bundles can take incoming Integrated Services Digital Network (ISDN) or voice (modem) calls and

automatically switch them to the appropriate internal circuitry. The PRI/BRI switching is based on Q.931 messaging

in the ISDN D channel. This out-of-band signaling channel provides a way for the telephone network to label each

call by call type. When an incoming call is labeled “voice” by the telephone network, the Cisco 3700 Series dial

bundle directs it to one of its modems. A call labeled “ISDN data” is directed to one of its High-Level Data Link

Control (HDLC) controllers. This feature allows one phone number to work for both modem and ISDN users. R2

and CT1 interfaces also support this switching ability. BRI WICs do not support this “call switching” feature.

Cisco 3700 Series dial bundles provide complete centrally managed modem capabilities, key requirements for

branches and enterprises building midsize dial-in pools. The digital modems can be managed via the same Simple

Network Management Protocol (SNMP)-based tools used to manage the rest of the network, providing network

managers with one solution at a central management point. Optional enhanced modem management (Management

Modem Technology License [MMTL]) capabilities allow for the gathering of modem statistics, real-time

call-in-progress, monitoring modem activity log, modem hard/soft busy out, and the ability to accomplish modem

firmware upgrades.

The installed modems can be used by LAN users for dial-out and fax-out applications, using third-party applications

such as clients available from Tactical Software. The modems can be assigned as dial-in, dial-out, or both. Dial-out

support allows LAN users to use the modems during the day for outgoing calls and use the same modems in the

evening for incoming calls from home users. The ever-expanding numbers of remote users can be easily

accommodated with dial bundle’s support for multilink multichassis Point-to-Point Protocol (PPP), allowing dial-in

pools of lines to span numerous Cisco 3700 Series routers. This option gives users flexible, scalable bandwidth

options by bonding channels together to provide amalgamated bandwidth. Through the use of Layer 2 Forwarding

(L2F) technology and the exclusive Cisco Stack Group Bidding Protocol (SGBP), the Cisco 3700 Series can grow to

meet the requirements of fast-growing and frequently changing dial environments. Since the essential building block

is a relatively small investment, enterprises and branch offices can scale from very small to larger installations.