Table Of Contents
Synchronous and Asynchronous Mode Configurations
Platform Support for the NM-16A/S Feature
Configuring the Slow-Speed Interfaces for NM-16A/S
Configuring the ignore Command for NM-16A/S
Configuration Examples for NM-16A/S
NM-16A/S
The NM-16A/S is a slow-speed, high-density serial network module (NM) offering asynchronous and synchronous interfaces and flexible port configuration. The NM-16A/S offers:
•Synchronous interfaces that support a data rate of up to 128 kbps
•Asynchronous interfaces that support a data rate of up to 115.2 kbps
•Configurable data terminal equipment (DTE) and data circuit-terminating equipment (DCE)
Feature History for NM-16A/S
Release Modification12.2(15)ZJ
This feature was introduced.
12.3(2)T
This feature was integrated into Cisco IOS Release 12.3(2)T.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Contents
•How to Configure the NM-16A/S
•Configuration Examples for NM-16A/S
Prerequisites for NM-16A/S
This feature requires Cisco IOS Release 12.2(15)ZJ or Release 12.3(2)T or a later release.
Restrictions for NM-16A/S
The NM-16A/S is factory configurable and not field upgradable.
Information About NM-16A/S
To configure the NM-16A/S feature, you must understand the following concept.
•Synchronous and Asynchronous Mode Configurations
•Platform Support for the NM-16A/S Feature
Synchronous and Asynchronous Mode Configurations
The synchronous ports are addressed as interface serial slot/port. The asynchronous port, when configured, utilizes the tty line numbering scheme, which is linear and allows for 32 tty ports per network module slot. Table 1 shows the port number corresponding to tty line number.
Platform Support for the NM-16A/S Feature
This feature is supported on Cisco 2610XM, Cisco 2611XM, Cisco 2620XM, Cisco 2621XM, Cisco 2650XM, Cisco 2651XM, Cisco 2691, Cisco 3631, Cisco 3660, Cisco 3725, and Cisco 3745 routers.
This feature is not supported on the non-XM models of the Cisco 2610, Cisco 2611, Cisco 2620, Cisco 2621, Cisco 2650, Cisco 2651. This feature is not supported on the Cisco 3620, Cisco 3640, and Cisco 3640/A routers.
How to Configure the NM-16A/S
This section contains the following procedures:
•Configuring the Slow-Speed Interfaces for NM-16A/S
•Configuring the ignore Command for NM-16A/S
Configuring the Slow-Speed Interfaces for NM-16A/S
To specify the mode of a slow-speed serial interface on a router as either synchronous or asynchronous, use the following commands:
SUMMARY COMMANDS
1. enable
2. configure terminal
3. interface serial slot/port
4. physical-layer {sync | async}
5. clock rate {speed | line rate}
6. speed bps
7. ip address ip-address mask [secondary]
8. encapsulation encapsulation-type
9. load-interval seconds
10. exit
DETAILED COMMANDS
Configuring the ignore Command for NM-16A/S
Perform this task to configure the serial interface to ignore the specified signals as the line up/down indicator:
SUMMARY STEPS
1. enable
2. configure terminal
3. interface serial slot/port
4. ignore [dtr | rts]
or
ignore [dtr | local-loopback | rts]
or
ignore [cts | dsr]
or
ignore [cts | dcd | dsr]5. exit
DETAILED STEPS
What to Do Next
To verify that the slow-speed serial interface is configured correctly, enter the show interfaces serial privileged EXEC command to display the command settings for the router.
To enable the transition of the serial control leads to be reported on the console, use the debug serial lead-transition command in privileged EXEC mode.
Caution To avoid having the debug message flood the console screen with debug information, use these commands only when traffic on the IP network is low, so other activity on the system is not adversely affected.
The following is sample output from the debug serial lead-transition command:
Router# debug serial lead-transition
Router# debug condition interface serial 1/1
*Mar 1 00:17:15.040:slot(1) Port(1):DSR/DTR is Deasserted*Mar 1 00:17:15.040:slot(1) Port(1):CTS/RTS is Deasserted*Mar 1 00:17:47.955:slot(1) Port(1):DCD/Local Loop is Deasserted*Mar 1 00:17:47.955:slot(1) Port(1):DSR/DTR is Deasserted*Mar 1 00:17:47.955:slot(1) Port(1):CTS/RTS is DeassertedRouter# no shut down serial 1/1
*Mar 1 00:16:52.298:slot(1) Port(1):DSR/DTR is Asserted*Mar 1 00:16:52.298:slot(1) Port(1):CTS/RTS is Asserted*Mar 1 00:16:31.648:slot(1) Port(1):DCD/Local Loop is Asserted*Mar 1 00:16:31.648:slot(1) Port(1):DSR/DTR is Asserted*Mar 1 00:16:31.648:slot(1) Port(1):CTS/RTS is AssertedConfiguration Examples for NM-16A/S
The following is sample output from the show running-config command:
show running-config Example
interface Serial1/0ip address 10.1.0.2 255.255.255.0load-interval 30no keepaliveclockrate 128000fair-queueno cdp enable!interface Serial1/1ip address 10.2.0.2 255.255.255.0load-interval 30no keepaliveclockrate 128000fair-queueno cdp enable!interface Serial1/2ip address 10.3.0.2 255.255.255.0load-interval 30no keepaliveclockrate 128000fair-queueno cdp enable!interface Serial1/3ip address 10.4.0.2 255.255.255.0load-interval 30no keepaliveclockrate 128000fair-queueno cdp enable!interface Serial1/4ip address 10.5.0.2 255.255.255.0load-interval 30no keepaliveclockrate 128000fair-queueno cdp enable!interface Serial1/5ip address 10.6.0.2 255.255.255.0load-interval 30no keepaliveclockrate 128000fair-queueno cdp enable!interface Serial1/6ip address 10.7.0.2 255.255.255.0load-interval 30no keepaliveclockrate 128000fair-queueno cdp enable!interface Serial1/7ip address 10.8.0.2 255.255.255.0load-interval 30no keepaliveclockrate 128000fair-queueno cdp enable!interface Serial1/8physical-layer asyncip address 10.9.0.2 255.255.255.0encapsulation pppload-interval 60async mode dedicatedfair-queue 64 16 0!interface Serial1/9physical-layer asyncip address 10.10.0.2 255.255.255.0encapsulation pppload-interval 60async mode dedicatedfair-queue 64 16 0!interface Serial1/10physical-layer asyncip address 10.11.0.2 255.255.255.0encapsulation pppload-interval 60async mode dedicatedfair-queue 64 16 0!interface Serial1/11physical-layer asyncip address 10.12.0.2 255.255.255.0encapsulation pppload-interval 60async mode dedicatedfair-queue 64 16 0!interface Serial1/12physical-layer asyncip address 10.13.0.2 255.255.255.0encapsulation pppload-interval 60async mode dedicatedfair-queue 64 16 0!interface Serial1/13physical-layer asyncip address 10.14.0.2 255.255.255.0encapsulation pppload-interval 60async mode dedicatedfair-queue 64 16 0!interface Serial1/14physical-layer asyncip address 10.15.0.2 255.255.255.0encapsulation pppload-interval 60async mode dedicatedfair-queue 64 16 0!interface Serial1/15physical-layer asyncip address 10.16.0.2 255.255.255.0encapsulation pppload-interval 60async mode dedicated!endAdditional References
The following sections provide references related to NM-16A/S.
Related Documents
MIBs
RFCs
Technical Assistance
Glossary
ATM—asynchronous transfer mode.
cts—clear to send. Circuit in the EIA/TIA-232 specification that is activated when DCE is ready to accept data from a DTE.
DCE—data circuit-terminating equipment (ITU-T expansion). Devices and connections of a communications network that comprise the network end of the user-to-network interface. The DCE provides a physical connection to the network, forwards traffic, and provides a clocking signal used to synchronize data transmission between DCE and DTE devices. Modems and interface cards are examples of DCE. Compare with DTE.
dcd—data carrier detect. DCD is a signal from the DCE device that typically means that the DCE is ready to accept data. If the DCE device is a modem, the DCD signal traditionally refers to the modem having received a modulation carrier signal and is now able to pass data.
DDR—dial-on-demand routing.
dsr—data set ready. EIA/TIA-232 interface circuit that is activated when DCE is powered up and ready for use.
DTE—data terminal equipment. Device at the user end of a user-to-network interface that serves as a data source, destination, or both. DTE connects to a data network through a DCE device (for example, a modem) and typically uses clocking signals generated by the DCE. DTE includes such devices as computers, protocol translators, and multiplexers. Compare with DCE.
dtr—data terminal ready. EIA/TIA-232 circuit that is activated to let the DCE know when the DTE is ready to send and receive data.
HDLC—High-Level Data Link Control.
ISL—Inter-Switch Link.
LAPB—Link Access Procedure, Balanced.
NIM—network interface module.
PPP—Point-to-Point Protocol.
rts—request to send. EIA/TIA-232 control signal that requests a data transmission on a communications line.
SLIP—Serial Line Internet Protocol.
SMDS—Switched Multimegabit Data Services.
VIP—Versatile Interface Processor.
Note Refer to the Internetworking Terms and Acronyms for terms not included in this glossary.
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