Table Of Contents
Clock Configuration for Cisco 1751/1760 Routers
Clock Configuration for Data Only Images
T1/E1 Data Configuration Examples
Clock Configuration for Voice Images
TDM Clocking with a BRI VIC Present
TDM Clocking with a BRI VIC and a T1/E1 VWIC Present
TDM Clocking with a BRI VIC and a xDSL WIC Present
TDM Clocking with a T1/E1 VWIC and a xDSL WIC Present
TDM Clocking with a T1/E1 VIC, BRI VIC, and xDSL WIC Present
TDM Clocking with a T1/E1 VWIC
TDM Clocking with Two T1/E1 VWICs
Cisco Product Security Overview
Reporting Security Problems in Cisco Products
Obtaining Technical Assistance
Cisco Technical Support Website
Definitions of Service Request Severity
Obtaining Additional Publications and Information
Clock Configuration for Cisco 1751/1760 Routers
This document provides information for configuring clocking on the Cisco 1751 and 1760 routers. There are two methods for configuring clocking.
The first method is for data only configurations. This method is used when the router is executing data only images of the Cisco IOS software. These are images which do not support voice applications (the image names do not have a "v" in them). This method applies to the following Voice/WAN Interface Cards (VWICs).
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The second method is for voice-supporting images (those images that do have a "v" in their image names). For these images, this document provides information for configuring the time-division multiplexing (TDM) clock on interface cards that supply a TDM clock, specifically the following:
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Clock Configuration for Data Only Images
The Cisco 1- and 2-port T1/E1 multiflex interface cards support generic single- or dual-port T1 or E1 trunk interfaces for voice, data, and integrated voice/data applications. These cards provide basic structured T1 service, as well as structured and unstructured E1 services, and can be used as trunk interfaces for data services only, such as fractional n x 64 Kbps service for WANs.
clock source Command
The clock source command specifies the clock source for transmitted data for the T1 or E1 VWIC.
The command is used when the router has been put into the controller configuration mode for T1 or E1 for a specified port on the VWIC.
The syntax of the command is as follows:
clock source {line[primary]|internal} [independent]The line keyword (the default setting) specifies that the clock source is derived from the active line. The internal keyword specifies the free-running internal clock.
These rules apply to clock sourcing:
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T1/E1 Data Configuration
Follow these steps to configure your digital T1/E1 voice WAN interface card (VWIC) for WAN data traffic.
T1/E1 Data Configuration Examples
This section shows an example of clocking for a digital T1/E1 VWIC configured for Frame Relay to send WAN data traffic.
Figure 1 shows a diagram for the configuration example.
Figure 1 Configuration Example for T1/E1 WAN
T1 Configuration Example
This section shows a clocking configuration example for T1 for Router A, a Cisco 1751 router. (See Figure 1.)
card type t1 0controller T1 1/0framing esfclock source internallinecode b8zschannel-group 0 timeslots 1-24!This section shows the corresponding T1 clocking configuration for Router B, a Cisco 3600 series router. (See Figure 1.)
controller T1 1/0framing esflinecode b8zschannel-group 0 timeslots 1-24 speed 64!E1 Configuration Example
This section shows a clocking configuration example for E1 for Router A, a Cisco 1751 router. (See Figure 1.)
card type e1 0controller E1 1/0framing crc4clock source internallinecode hdb3channel-group 0 timeslots 1-31!This section shows the corresponding E1 clocking configuration for Router B, a Cisco 3600 series router. (See Figure 1.)
controller E1 1/0framing crc4linecode hdb3channel-group 0 timeslots 1-31!Verifying Controller Settings
The show controller t1/e1 command displays the status of T1 or E1 controllers, clock sources, and other settings for the ports. See the following examples for a T1 controller and an E1 controller, respectively.
Router#show controller t1 1/0T1 1/0 is up.Applique type is Channelized T1Cablelength is long gain36 0dbNo alarms detected.alarm-trigger is not setVersion info Firmware: 20011109, FPGA: 15Framing is ESF, Line Code is B8ZS, Clock Source is Internal.Data in current interval (130 seconds elapsed):0 Line Code Violations, 0 Path Code Violations0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail SecsRouter#show controller e1 1/0E1 1/0 is up.Applique type is Channelized E1 - balancedNo alarms detected.alarm-trigger is not setVersion info Firmware: 20011109, FPGA: 15Framing is CRC4, Line Code is HDB3, Clock Source is Internal.Data in current interval (17 seconds elapsed):0 Line Code Violations, 0 Path Code Violations0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail SecsClock Configuration for Voice Images
On a Cisco 1751 router, a maximum of two T1/E1 voice WAN interface card (VWIC) ports can be used for data, and a maximum of two T1/E1 VWIC ports can be used for voice. If the router has one WIC, only one T1/E1 VWIC port can be used for data. If the router has one or two VICs, only one T1/E1 VWIC port can be used for voice.
On a Cisco 1760 router, a maximum of two T1/E1 VWIC ports can be used for data, and a maximum of four T1/E1 VWIC ports can be used for voice. If the router has one WIC, only one T1/E1 VWIC port can be used for data. If the router has one or two VICs, only three T1/E1 VWIC ports can be used for voice. If the router has three VICs, only two T1/E1 VWIC ports can be used for voice.
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clock source Command
The clock source command specifies the clock source for transmitted data for the T1 or E1 VWIC.
The command is used when the router has been put into the controller configuration mode for T1 or E1 for a specified port on the VWIC.
The syntax of the command is as follows:
clock source {line [primary | bits] | internal} [independent]The line keyword (the default setting) specifies that the clock source is derived from the active line. The internal keyword specifies the free-running internal clock.
These rules apply to clock sourcing:
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tdm clock Configuration
The following conditions must be met before configuring TDM clock:
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tdm clock Command
The tdm clock global configuration command configures the clock source for the T1 VWIC, E1 VWIC, BRI VIC, ADSL, and G.SHDSL WICs. The complete syntax for various clock scenarios is shown in this section.
Exporting Clock
The following shows the command for exporting the clock.
tdm clock {T1 | E1} <slot/port> {voice | data | both} export linetdm clock {atm | bri} <slot/port> exportImporting Clock
The following shows the command for importing the clock.
tdm clock {T1 | E1} <slot/port> {voice | data | both} import {T1 | E1 | atm | bri | onboard} <slot/port> {line | internal}tdm clock {atm | bri} <slot/port> import {T1 | E1 | atm | bri | onboard} <slot/port>TDM Clock Auto Selection for BRI
The following command sets the TDM clock auto selection for BRI only.
tdm clock bri-autoParameter Definitions
This section identifies the tdm clock command parameters.
T1/E1 Multiflex Module
The following example shows how to use the internal onboard system clock as the source.
Router(config) # tdm clock T1 0/0 both import onboard internalThe following example shows how to use the external clock, provided by the network, as the source.
Router(config) # tdm clock T1 0/0 both export lineRouter(config) # tdm clock T1 0/1 both import T1 0/0 internalADSL and SHDSL Module
The following example shows how to use the internal onboard system clock as the source.
Router(config) # tdm clock atm 1/0 import onboardThe following example shows how to use the external clock as the source.
Router(config) # tdm clock atm 1/0 exportBRI NT/TE Module
The following example shows how to use the internal onboard system clock as the source.
Router(config) # tdm clock bri 0/0 import onboardThe following example shows how to use the external clock as the source.
Router(config) # tdm clock bri 0/0 exportPort Clocking Priority
If the configured export port is down, one of the import ports becomes an export port. The priority by which an import port becomes export port is as follows:
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no tdm clock Command
The no option for the tdm clock command turns off the TDM clock for the port. For example:
Router(config)# no tdm clock bri 3/1 import bri 3/0Router(config)# no tdm clock bri 3/0 exportOr
Router(config)# no tdm clock atm 0/0 import T1 0/0Router(config)# no tdm clock T1 0/1 both import T1 0/0 internalRouter(config)# no tdm clock T1 0/0 voice export lineshow tdm clock Command
The show tdm clock command displays the real-time TDM clock status; for example:
Router# show tdm clockPort Payload State TDM-Clock-type1/0 N/A up Export2/0 N/A up Import 1/02/1 N/A up Import 1/0Tdm-Clock Sourced Feed Back-Up0 1/0 2/0,2/1The show running-config command displays the configured TDM clock.
tdm clock bri-auto Command
The tdm clock bri-auto command selects the clock source for BRI ports automatically.
Router(config)# tdm clock bri-autoThis command cannot coexist with a tdm clock bri import | export command. If tdm clock bri-auto is configured, the lowest BRI slot/port in TE mode is selected as the export port, and all the other BRI ports are configured as import ports for this BRI port.
TDM Clock Default and Status
Table 1 shows the power-up default configuration of the TDM clock values for the Cisco 1751 router and Table 2 shows the power-up default configuration of the TDM clock values for the Cisco 1760 router. The status of the running TDM clock can be obtained by using the show tdm clock command.
TDM Clocking Scenarios
This section describes the timing scenarios that can occur when different combinations of WICs, VICs, and VWICs are used in the slots of the router.
TDM Clocking with a BRI VIC Present
The examples in this section show clocking for a router with a BRI VIC present in slot 0. The remaining slots might have other interface cards.
The following configuration sets up the clocking method shown in Figure 2.
Router(config)# tdm clock bri-autoFigure 2 None of the Ports Receives the Clock
The following configuration sets up the clocking method shown in Figure 3.
Router(config)# tdm clock bri-autoOr
Router(config)# tdm clock bri 0/0 exportRouter(config)# tdm clock bri 0/1 import bri 0/0Figure 3 Port 0/0 Receives the Clock
The following configuration sets up the clocking method shown in Figure 4.
Router(config)# tdm clock bri-autoOr
Router(config)# tdm clock bri 0/1 exportRouter(config)# tdm clock bri 0/0 import bri 0/1Figure 4 Port 0/1 Receives the Clock
The following configuration sets up the clocking method shown in Figure 5.
Router(config)# tdm clock bri-autoOr
Router(config)# tdm clock bri 0/0 exportRouter(config)# tdm clock bri 0/1 import bri 0/0Figure 5 Only the TE Port Receives the Clock
TDM Clocking with a BRI VIC and a T1/E1 VWIC Present
The examples in this section show clocking for routers with a BRI VIC and a T1/E1 VWIC present. Slot 0 has a T1/E1 card. Slot 1 has a BRI card. The remaining slots might have other cards that do not require TDM clocking.
The following configuration sets up the clocking method shown in Figure 6.
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 both import E1 0/0 lineRouter(config)# tdm clock bri-autoOr
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 both import E1 0/0 lineRouter(config)# tdm clock bri 1/0 import E1 0/0Router(config)# tdm clock bri 1/1 import E1 0/0Figure 6 T1/E1 Ports Receive the Clock
The following configuration sets up the clocking method shown in Figure 7.
Router(config)# tdm clock bri 1/0 exportRouter(config)# tdm clock bri 1/1 import bri 1/0Router(config)# tdm clock E1 0/0 both import bri 1/0 internalRouter(config)# tdm clock E1 0/1 both import bri 1/0 internalFigure 7 BRI Ports Receive the Clock
The following configuration sets up the clocking method shown in Figure 8.
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 both import E1 0/0 lineRouter(config)# tdm clock bri-autoOr
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 both import E1 0/0 lineRouter(config)# tdm clock bri 1/0 import E1 0/0Router(config)# tdm clock bri 1/1 import E1 0/0Figure 8 T1/E1 Ports Receive the Clock
TDM Clocking with a BRI VIC and a xDSL WIC Present
The examples in this section show clocking for routers with a BRI VIC and xDSL WIC present. The following parameters apply:
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The following configuration sets up the clocking method shown in Figure 9.
Router(config)# tdm clock bri-autoOr
Router(config)# tdm clock bri 0/0 exportRouter(config)# tdm clock bri 0/1 import bri 0/0Or
Router(config)# tdm clock bri 0/0 exportRouter(config)# tdm clock bri 0/1 import bri 0/0Router(config)# tdm clock atm 1/0 import bri 0/0Figure 9 BRI Ports Receive the Clock
The following configuration sets up the clocking method shown in Figure 10.
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock bri 0/0 import atm 1/0Router(config)# tdm clock bri 0/1 import atm 1/0Or
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock bri-autoFigure 10 DSL Port Receives the Clock
The following configuration sets up the clocking method shown in Figure 11.
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock bri 0/0 import atm 1/0Router(config)# tdm clock bri 0/1 import atm 1/0Or
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock bri-autoFigure 11 Only the DSL Port Can Receive the Clock
The following configuration sets up the clocking method shown in Figure 12.
Router(config)# tdm clock bri-autoOr
Router(config)# tdm clock bri 0/1 exportRouter(config)# tdm clock bri 0/0 import bri 0/1Or
Router(config)# tdm clock bri 0/1 exportRouter(config)# tdm clock bri 0/0 import bri 0/1Router(config)# tdm clock atm 1/0 import bri 0/1Figure 12 Only BRI TE Can Receive the Clock
The following configuration sets up the clocking method shown in Figure 13.
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock bri 0/0 import atm 1/0Router(config)# tdm clock bri 0/1 import atm 1/0Or
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock bri-autoFigure 13 DSL Port Receives the Clock
TDM Clocking with a T1/E1 VWIC and a xDSL WIC Present
The examples in this section show clocking for routers with a T1/E1 VWIC and xDSL WIC present. The following parameters apply:
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The following configuration sets up the clocking method shown in Figure 14.
Router(config)# tdm clock T1 0/0 both export lineRouter(config)# tdm clock T1 0/1 voice import T1 0/0 lineOr
Router(config)# tdm clock T1 0/0 both export lineRouter(config)# tdm clock T1 0/1 voice import T1 0/0 lineRouter(config)# tdm clock atm 1/0 import T1 0/0Figure 14 T1/E1 VWIC Ports Receive the Clock
The following configuration sets up the clocking method shown in Figure 15.
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock T1 0/0 both import atm 1/0 internalRouter(config)# tdm clock T1 0/1 voice import atm 1/0 internalFigure 15 DSL Port Receives the Clock
TDM Clocking with a T1/E1 VIC, BRI VIC, and xDSL WIC Present
The examples in this section show clocking for routers with a T1/E1, BRI VIC, and xDSL WIC present. The following parameters apply:
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The following configuration sets up the clocking method shown in Figure 16.
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 voice import E1 0/0 lineRouter(config)# tdm clock bri-autoOr
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 voice import E1 0/0 lineRouter(config)# tdm clock bri 2/0 import E1 0/0Router(config)# tdm clock bri 2/1 import E1 0/0Or
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 voice import E1 0/0 lineRouter(config)# tdm clock bri-autoRouter(config)# tdm clock atm 1/0 import E1 0/0Figure 16 T1/E1 Ports Receive the Clock
The following configuration sets up the clocking method shown in Figure 17.
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock E1 0/0 both import atm 1/0 internalRouter(config)# tdm clock E1 0/1 voice import atm 1/0 internalRouter(config)# tdm clock bri-autoOr
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock E1 0/0 both import atm 1/0 internalRouter(config)# tdm clock E1 0/1 voice import atm 1/0 internalRouter(config)# tdm clock bri 2/0 import atm 1/0Router(config)# tdm clock bri 2/1 import atm 1/0Figure 17 DSL Port Receives the Clock
The following configuration sets up the clocking method shown in Figure 18.
Router(config)# tdm clock bri 2/0 exportRouter(config)# tdm clock bri 2/1 import bri 2/0Router(config)# tdm clock E1 0/0 both import bri 2/0 internalRouter(config)# tdm clock E1 0/1 voice import bri 2/0 internalOr
Router(config)# tdm clock bri 2/0 exportRouter(config)# tdm clock bri 2/1 import bri 2/0Router(config)# tdm clock E1 0/0 both import bri 2/0 internalRouter(config)# tdm clock E1 0/1 voice import bri 2/0 internalRouter(config)# tdm clock atm 1/0 import bri 2/0Figure 18 BRI TE Ports Receive the Clock
TThe following configuration sets up the clocking method shown in Figure 19.
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 voice import E1 0/0 lineRouter(config)# tdm clock bri-autoOr
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 voice import E1 0/0 lineRouter(config)# tdm clock bri 2/0 import E1 0/0Router(config)# tdm clock bri 2/1 import E1 0/0Or
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 voice import E1 0/0 lineRouter(config)# tdm clock bri-autoRouter(config)# tdm clock atm 1/0 import E1 0/0Or
Router(config)# tdm clock E1 0/0 both export lineRouter(config)# tdm clock E1 0/1 voice import E1 0/0 lineRouter(config)# tdm clock bri 2/0 import E1 0/0Router(config)# tdm clock bri 2/1 import E1 0/0Router(config)# tdm clock atm 1/0 import E1 0/0Figure 19 T1/E1 Ports Receive the Clock
The following configuration sets up the clocking method shown in Figure 20.
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock E1 0/0 both import atm 1/0 internalRouter(config)# tdm clock E1 0/1 voice import atm 1/0 internalRouter(config)# tdm clock bri-autoOr
Router(config)# tdm clock atm 1/0 exportRouter(config)# tdm clock E1 0/0 both import atm 1/0 internalRouter(config)# tdm clock E1 0/1 voice import atm 1/0 internalRouter(config)# tdm clock bri 2/0 import atm 1/0Router(config)# tdm clock bri 2/1 import atm 1/0Figure 20 DSL Port Receives the Clock
TDM Clocking with a T1/E1 VWIC
The examples in this section describe the timing topologies that can result when slot 0 is a T1/E1 interface and all other slots are empty. Slot 0 is shown in the examples, but the configurations apply to a T1/E1 interface in any slot.
The following configuration sets up the clocking method shown in Figure 21:
Router(config)# tdm clock T1 0/0 voice import onboard
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Figure 21 Single T1 Port Providing Clocking
The following configuration sets up the clocking method shown in Figure 22:
Router(config)# tdm clock T1 0/0 voice export lineFigure 22 Single T1 Port Receiving Clocking from Line
The following configuration sets up the clocking method shown in Figure 23.
Router(config)# tdm clock T1 0/0 voice export lineRouter(config)# tdm clock T1 0/1 voice import t1 0/0 lineFigure 23 Dual T1 Ports Receiving Line Clocking
The following configuration sets up the clocking method shown in Figure 24.
Router(config)# tdm clock T1 0/0 voice export lineRouter(config)# tdm clock T1 0/1 voice import t1 0/0 internalFigure 24 Dual T1 Ports, One Receiving Clocking and One Providing Clocking
The following configuration sets up the clocking method shown in Figure 25.
Router(config)# tdm clock T1 0/0 voice import onboard internalRouter(config)# tdm clock T1 0/1 voice import onboard internalFigure 25 Dual T1 Ports, Both Ports Provide Clocking to the Line
TDM Clocking with Two T1/E1 VWICs
The examples in this section describe the timing topologies that can result when there are T1/E1 interfaces in any two slots. The following parameters apply:
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The following configuration sets up the clocking method shown in Figure 26.
Router(config)# tdm clock T1 0/0 voice export lineRouter(config)# tdm clock T1 1/0 voice import t1 0/0 lineFigure 26 Dual T1 Ports Receiving Line Clocking
The following configuration sets up the clocking method shown in Figure 27.
Router(config)# tdm clock T1 0/0 voice export lineRouter(config)# tdm clock T1 1/0 voice import t1 0/0 internalFigure 27 Dual T1 Ports, One Receiving Clocking and One Providing Clocking
The following configuration sets up the clocking method shown in Figure 28.
Router(config)# tdm clock T1 0/0 voice import onboardRouter(config)# tdm clock T1 1/0 voice import onboardFigure 28 Dual T1 Ports, Both Ports Providing Clocking to the Line
Related Documentation
This document provides updated information on Cisco 1- and 2-port T1/E1 multiflex interface cards. This information supplements the Cisco Interface Cards Hardware Installation Guide.
Use this document with the following guides:
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http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/1700/index.htm
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