Cisco 3825 Hardware Installation Guide - Page 119

CH A P T E R 6 Connecting ISDN BRI Network Modules This chapter describes how to connect Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) network modules for Cisco modular routers and contains the following sections: • 4- and 8-Port ISDN BRI S/T Network Modules, page 6-1 • 4- and 8-Port ISDN BRI U Network Modules, page 6-3 • Upgrading ISDN BRI Network Modules, page 6-6 Unless specifically identified, references to BRI modules in this chapter include all ISDN BRI network modules. Note Do not install an ISDN BRI network module in the same chassis as an ISDN Primary Rate Interface (PRI) network module unless you are using Cisco IOS Release 11.3(3)T or later. Earlier Cisco IOS releases do not support this configuration. Tip To determine whether your router supports a specific network module, see Table 1-6 on page 1-16. 4- and 8-Port ISDN BRI S/T Network Modules This section provides information about the following network modules for Cisco modular routers: • 4-port ISDN BRI network module (NM-4B-S/T or CPANM-4B-S/T) (see Figure 6-1). This module connects to an ISDN WAN through an external Network Termination 1 (NT1) device (also known as an S/T interface). It is also referred to as the 4-port BRI S/T network module. • 8-port ISDN BRI network module (NM-8B-S/T or CPANM-8B-S/T) (see Figure 6-2). This module connects to an ISDN WAN through an external NT1 device (also known as an S/T interface). It is also referred to as the 8-port BRI S/T network module. OL-2485-20 Cisco Network Modules Hardware Installation Guide 6-1