![]() Check the LEDs on the CSU/DSU to see if CD is active, or insert a breakout box on the line to check for the CD signal.Telephone company problem-Line is down or line is not connected to CSU/DSU.Typically indicates that the router is not sensing a CD signal (that is, CD is not active).Serial x is down, line protocol is down (DTE mode) This is the proper status line condition. Table 15-1: Serial Lines: show interfaces serial Status Line Conditions - This table shows the interface status conditions, possible problems associated with the conditions, and solutions to those problems. Serial x is administratively down, line protocol is downįigure 15-1 Output of the HDLC show interface serial Command Serial x is up, line protocol is down (disabled) Serial x is up, line protocol is up (looped) You can identify five possible problem states in the interface status line of the show interfaces serial display (see Figure 15-1): Serial Lines: show interfaces serial Status Line Conditions Other fields shown in the display are described in detail in the section "Detailed Information on the show interfaces serial Command," later in this chapter. The following sections describe some of the important fields of the command output. ![]() This section describes how to use the show interfaces serial command to diagnose serial line connectivity problems in a wide area network (WAN) environment. Figure 15-1 shows the output of the show interfaces serial EXEC command for a High-Level Data Link Control (HDLC) serial interface. The output of the show interfaces serial EXEC command displays information specific to serial interfaces. Troubleshooting Using the show interfaces serial Command Conventionsįor more information on document conventions, see the Cisco Technical Tips Conventions. If you are working in a live network, ensure that you understand the potential impact of any command before using it. All of the devices used in this document started with a cleared (default) configuration. The information presented in this document was created from devices in a specific lab environment. This document is not restricted to specific software and hardware versions. Readers of this document should be knowledgeable of the following definitions. Troubleshooting Using the show interfaces serial Commandĭetailed Information on the show interfaces serial Command The chapter consists of the following sections: Note: The arrows indicate signal direction:ġAny pin that is not referenced is not connected.This chapter presents general troubleshooting information and a discussion of tools and techniques for troubleshooting serial connections. ![]() The table here shows the V.35 DTE cable pinouts (DB-60 to 34-Pin). This cable has a male DB-60 connector on the Cisco end and a male Winchester connector on the network end. The CAB-V35MT serial cable is used in the Cisco 7000 family, Cisco 4000 series, Cisco 3600 series, Cisco 2500 series, Cisco 1600 series, Cisco access servers, and AccessPro PC cards. The cable gender for this product (part number 72-0791-01) is male DB-60 to male Winchester 15 Pin, mode - DTE. Cisco advices not to exceed this maximum as it could result in loss of data. The table here lists the different V.35 speed and distance limitations:Ĭaution: The EIA,TIA-449 and V.35 interfaces support data rates up to 2.048 Mbps. Conventionsįor more information on document conventions, refer to the Cisco Technical Tips Conventions. If your network is live, make sure that you understand the potential impact of any command. The information in this document was created from the devices in a specific lab environment. There are no specific requirements for this document. ![]() This document explains the V.35 serial cable assembly and pinouts. ![]()
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