Cisco 1941-DC-A Hardware Installation Guide - Page 125
Connecting ISDN PRI NetworkModules
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CH A P T E R 7 Connecting ISDN PRI Network Modules This chapter describes how to connect Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) network modules for Cisco modular routers and contains the following sections: • Channelized T1/E1 PRI Network Modules with G.703, page 7-2 • Channelized T1/ISDN PRI Network Modules, page 7-6 • Channelized T1/ISDN PRI with CSU Network Modules, page 7-7 • Channelized E1/ISDN PRI Balanced (120-Ohm) Network Modules, page 7-9 • Channelized E1/ISDN PRI Unbalanced (75-Ohm) Network Modules, page 7-11 • PRI Module LEDs, page 7-13 • Online Insertion and Removal with a Cisco PRI Network Module (Cisco 3660 and Cisco 3745 Only), page 7-17 • Upgrading ISDN PRI Network Modules, page 7-17 Note Unless specifically identified, references to PRI modules in this chapter include all these network modules. Note Cisco Fast Ethernet-PRI network modules also provide a PRI interface. See Chapter 4, "Connecting Fast Ethernet-PRI Network Modules," for further information. Note Do not install an ISDN BRI network module in the same chassis as an ISDN 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. CT1/PRI modules are available with or without a built-in channel service unit (CSU), and with one or two ports. CT1/PRI modules connect to an external CSU; CT1/PRI-CSU modules connect directly to the network. Each T1 module provides up to 24 virtual channels per T1 port. Each channel can be configured individually as a serial interface. OL-2485-20 Cisco Network Modules Hardware Installation Guide 7-1
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