The following data-rate limitations apply to the slow-speed serial interfaces found on asynchronous and synchronous serial modules: Asynchronous and Synchronous Serial Module Data Rates Typically, EIA/TIA-449 and EIA/TIA-530 support 2-Mbps rates, and V.35 can support 4-Mbps rates. The recommended distance limits for EIA/TIA-449 shown in Table 3 are also valid for V.35, X.21, and EIA/TIA-530.
For instance, the recommended maximum rate for V.35 is 2 Mbps, but 4 Mbps is commonly used.īalanced drivers allow EIA/TIA-449 signals to travel greater distances than EIA/TIA-232 signals. If you understand and compensate for potential electrical problems, you may get good results at speeds and distances greater than those listed. Table 3 lists recommended maximum speeds and distances for each serial interface type. Generally, the slower the data rate, the greater the distance. About Data Rates and Distance LimitationsĪll serial signals are subject to distance limits, beyond which the signal degrades significantly or is completely lost. For further information, see the "Obtaining Documentation, Obtaining Support, and Security Guidelines" section. For ordering information, see the "Obtaining Documentation, Obtaining Support, and Security Guidelines" section.Īlthough manufacturing your own serial cables is not recommended (because of the small size of the pins on the DB-60 serial connector), cable pinouts are provided in the online document Cisco Modular Access Router Cable Specifications. Serial cables are not provided with the network module. EIA/TIA-530 and EIA/TIA-530A are available in DTE only. V.35 is available in either mode, with either gender at the network end.
For example, the network end of the EIA/TIA-232 serial cable is a DB-25 connector, the most widely used EIA/TIA-232 connector.Īll serial interface types except EIA/TIA-530 and EIA/TIA-530A are available in DTE or DCE format: DTE with a plug connector at the network end, and DCE with a receptacle at the network end. The network end of each cable provides the physical connectors most commonly used for the interface. The Smart Serial cable uses a 12-in-1 Smart Serial connector designed by Cisco. See the "12-in-1 Smart Serial Cables" section for instructions on connecting the surge protector cable.Ī standard serial cable uses a universal 60-pin plug at the network module or WAN interface card end. Tip A cable providing surge protection (CAB-SS-SURGE) is also available from Cisco Systems for use with the NM-16A/S network module. (Some devices have a jumper to select DTE or DCE mode.) If you cannot find this information in your documentation, see Table 1 to help you determine the proper device type. The documentation that accompanied the device should tell you whether it is DTE or DCE. DTE devices usually connect to DCE devices. A DTE device does not provide a clock signal. A DCE device provides a clock signal between the device and the router. Signaling standard required by the device About DTE and DCE DevicesĪ device that communicates over a synchronous serial interface is either a DTE or a DCE device.Type of connector, male or female, needed to connect to the device.Type of device-data terminal equipment (DTE) or data communications equipment (DCE)-you are connecting to.Obtaining Documentation, Obtaining Support, and Security Guidelines About Serial Connectionsīefore you connect a device to a serial port, you need to know the following:.4-, 8-, and 16-Port Asynchronous/Synchronous Serial Network Modules.16- and 32-Port Asynchronous Serial Network Modules.Asynchronous Network Module Interface Numbering.Connecting Asynchronous Network Modules to Asynchronous Devices.
This guide describes how to connect Cisco serial network modules to your network. Obtaining Documentation, Obtaining Support, and Security Guidelines
Connecting Cisco Serial Network Modules to the Network Table Of ContentsĬonnecting Cisco Serial Network Modules to the NetworkĪbout Serial Cables Used with Cisco 2600 Series, Cisco 3600 Series, Cisco 3700 Series, and Cisco MWR 1941-DC RoutersĪbout Data Rates and Distance LimitationsĪsynchronous and Synchronous Serial Module Data RatesĬonnecting Asynchronous Network Modules to Asynchronous DevicesĪsynchronous Network Module Interface NumberingĬisco 3600 Series and Cisco MWR 1941-DC Router 16- and 32-Port Interface NumberingĬisco 2600 Series and Cisco MWR 1941-DC Router Serial Interface NumberingĬonnecting the 4-Port Serial Module to a Networkġ6- and 32-Port Asynchronous Serial Network ModulesĤ-, 8-, and 16-Port Asynchronous/Synchronous Serial Network ModulesĪsynchronous/Synchronous Serial Module LEDs