Cisco 3825 Hardware Installation Guide - Page 121

Chapter 6 Connecting ISDN BRI Network Modules 4- and 8-Port ISDN BRI U Network Modules BRI S/T Module LEDs Figure 6-4 shows LEDs for the 4-port BRI S/T network module. Figure 6-5 shows LEDs for the 8-port BRI S/T network module. Figure 6-4 4-Port ISDN BRI S/T Network Module LEDs BRI S/T BRI 3 BRI 2 BRI 1 BRI 0 H7267 EN B1 B2 B1 B2 B1 B2 B1 B2 BRI S/T LEDs Enable LED Figure 6-5 8-Port ISDN BRI S/T Network Module LEDs BRI S/T BRI 7 BRI 6 BRI 5 BRI 4 BRI 3 BRI 2 BRI 1 BRI 0 H7266 B1 B2 B1 B2 B1 B2 B1 B2 EN B1 B2 B1 B2 B1 B2 B1 B2 BRI S/T LEDs BRI S/T LEDs Enable LED All network modules have an enable (EN) LED. This LED indicates that the module has passed its self-tests and is available to the router. In addition, BRI S/T modules have two LEDs for each port. These LEDs indicate call activity on the two ISDN BRI B channels, as described in Table 6-1. Table 6-1 BRI S/T Network Module LEDs LED Meaning B1 Call active on B1 channel B2 Call active on B2 channel 4- and 8-Port ISDN BRI U Network Modules This section provides information about the following network modules for Cisco modular routers: • 4-port ISDN BRI with NT1 network module (NM-4B-U or CPANM-4B-U) (see Figure 6-6). This module connects to an ISDN WAN using a built-in NT1 device (also known as a U interface). It is also referred to as the 4-port BRI U network module. • 8-port ISDN BRI with NT1 network module (NM-8B-U or CPANM-8B-U) (see Figure 6-7). This module connects to an ISDN WAN using a built-in NT1 device (also known as a U interface). It is also referred to as the 8-port BRI U network module. OL-2485-20 Cisco Network Modules Hardware Installation Guide 6-3