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Cisco 819 Series Integrated Services Routers Software Configuration Guide
OL-23590-02
Chapter 8 Configuring the Serial Interface
Legacy Protocol Transport
Legacy Protocol Transport
Serial and synchronous/asynchronous ports are ideally suited to transport legacy traffic across a TCP/IP
network, facilitating network convergence. Legacy protocols supported by Cisco IOSR Software
include:
• Synchronous Data Link Control (SDLC) Protocol
• Binary Synchronous Communications Protocol (Bisync)
• X.25 Protocol
Figure 8-2 Network Convergence
The Cisco 819 ISRs use Cisco Smart Serial connectors. The supported cables are noted in Table 8-1.
Configuring Serial Interfaces
When the router receives an indication that the primary interface is down, the backup interface becomes
enabled. After the primary connection has been restored for a specified period, the backup interface is
disabled.
Even if the backup interface comes out of standby mode, the router does not enable the backup interface
unless the router receives the traffic specified for that backup interface.
Ta b l e 8-1 Smart Serial Cabling for Cisco 819 ISRs
Product Number Cable Type Length Connector Type
CAB-SS-V35MT V.35 DTE 10 ft (3m) Male
CAB-SS-V35FC 10 ft (3m) Female V.35 DCE 10 ft (3m) Female
CAB-SS-232MT EIA/TIA-232 DTE 10 ft (3m) Male
CAB-SS-232FC EIA/TIA-232 DTE 10 ft (3m) Female
CAB-SS-449MT EIA/TIA-449 DTE 10 ft (3m) Male
CAB-SS-449FC EIA/TIA-449 DTE 10 ft (3m) Female
CAB-SS-X21MT X.21 DTE 10 ft (3m) Male
CAB-SS-X21FC X.21 DTE 10 ft (3m) Female
CAB-SS-530MT EIA/TIA-530 DTE 10 ft (3m) Male
CAB-SS-530AMT EIA/TIA-232 DTE 10 ft (3m) Male