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This chapter describes how to connect Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) network modules for Cisco modular routers. It contains the following sections:
Unless specifically identified, references to PRI modules in this chapter include all these network modules.
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Note The Fast Ethernet-PRI modules described in "Connecting Fast Ethernet-PRI Network Modules," also provide a PRI interface. See that chapter for further information. |
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.
CT1/PRI and CT1/PRI-CSU modules receive and transmit data bidirectionally at the T1 rate of 1.544 Mbps.
This section provides information about the following network modules for Cisco modular routers:
To connect a CT1/PRI module to the network, use a DB-15-to-DB-15 T1 serial cable to connect the CT1/PRI port to a T1 channel service unit (CSU). (See Figure 8-3.) These ports are color-coded tan.
This section provides information about the following network modules for Cisco modular routers:
To connect a CT1/PRI CSU module to the network, use a straight-through RJ-48C-to-RJ-48C cable to connect the RJ-48C port to an RJ-48C jack. (See Figure 8-6.) These ports are color-coded tan.
This section provides information about the following network modules for Cisco modular routers:
CE1/PRI modules are available with one or two E1 ports and with balanced or unbalanced interfaces. These modules receive and transmit data bidirectionally at the E1 rate of 2.048 Mbps, and provide up to 30 virtual channels per E1 port. Each channel can be configured individually as a serial interface.
Jumpers on CE1/PRI modules can be used to connect or disconnect receive shield to ground. (See Table 8-1.) The default setting for balanced, 120-ohm CE1/PRI-B modules disconnects receive shield to ground. The default setting for unbalanced, 75-ohm CE1/PRI-U modules connects receive shield to ground. If you are experiencing ground loop problems with E1 cabling, you may want to try changing the jumper settings for the module.
| CE1/PRI Module Type | Default Setting | Function |
|---|---|---|
Balanced, 120 ohm | 2 and 3 | Disconnects receive shield from ground |
Unbalanced, 75 ohm | 1 and 2 | Connects receive shield to ground |
To connect a CE1/PRI-B (120-ohm) module to the network, use the appropriate cable to connect the CE1/PRI-B port to an E1 CSU. (See Figure 8-9, Figure 8-10, and Figure 8-11, showing DB-15, twinax, and RJ-45 CSUs, respectively.) These ports are color-coded tan.
This section provides information about the following network modules for Cisco modular routers:
Jumpers on CE1/PRI modules can be used to connect or disconnect receive shield to ground. (See Table 8-2.) The default setting for balanced, 120-ohm CE1/PRI-B modules disconnects receive shield to ground. The default setting for unbalanced, 75-ohm CE1/PRI-U modules connects receive shield to ground. If you are experiencing ground loop problems with E1 cabling, you may want to try changing the jumper settings for the module.
| CE1/PRI Module Type | Default Setting | Function |
|---|---|---|
Balanced, 120 ohm | 2 and 3 | Disconnects receive shield from ground |
Unbalanced, 75 ohm | 1 and 2 | Connects receive shield to ground |
To connect a CE1/PRI-U (75-ohm) module to the network, use the appropriate cable to connect the CE1/PRI-U port to an E1 CSU. (See Figure 8-14.) These ports are color-coded tan. The illustration shows a CSU with BNC connectors.
Figure 8-15 and Figure 8-16 show CT1/PRI network module LEDs.
Figure 8-17 and Figure 8-18 show CT1/PRI CSU module LEDs.
Figure 8-19 and Figure 8-20 show CE1/PRI module LEDs. These LEDs are the same for balanced and unbalanced modules.
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.
All PRI modules display four additional LEDs for each port. These LEDs are described in Table 8-3.
| LED | Meaning |
|---|---|
REMOTE ALARM | Local alarm at remote end of connection |
LOCAL ALARM | Loss of signal, loss of frame, or unavailability because of excessive errors |
LOOPBACK | Controller local loopback |
CARRIER DETECT | Carrier received on telco link |
If your Cisco 3600 series router contains an ISDN PRI network module and a digital modem network module (product numbers NM-6DM, NM-12DM, NM-18DM, NM-24DM, NM-30DM), your ISDN PRI network module may need to be upgraded to revision level -03 or higher. Earlier revisions of the ISDN PRI network module cannot send modem calls to the digital modem network module.
If your PRI module is the wrong revision, you see a message similar to this one when the router boots:
The PRI network module in slot 0 is incompatible with the digital modems installed in the router.
To determine the revision level, you can examine the network module itself (outside the router) or use the Cisco IOS show diag command. The label on the module board should show a part number beginning with 800- and ending with the revision level.
The output of the show diag command looks similar to the following:
Port adapter is analyzed Port adapter insertion time unknown Hardware revision 1.0 Board revision A0 Serial number 4152626 Part number 800-01236-01 Test history 0x0 RMA number 00-00-00 EEPROM format version 1 EEPROM contents (hex): 0x20: 01 26 01 00 00 3F 5D 32 50 04 CC 01 00 00 00 00 0x30: 50 00 00 00 96 11 04 17 FF FF FF FF FF FF FF FF
To order network module upgrades, see the "Cisco Connection Online" section.
Posted: Fri Jun 2 16:59:05 PDT 2000
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