User's Manual

DEC. 2011—EFT REVIEW DRAFT—CISCO CONFIDENTIAL
2-27
Cisco 1240 Connected Grid Router Hardware Installation Guide
OL-12345-01
Chapter 2 Router Hardware Description
Hardware Features Detailed Description
Figure 2-20 Router IRIG-B Timing Port
The router features a single IRIG-B timing port (see Figure 2-20), which provides serial formatted time
codes to an optional connected device. IRIG-B output provides standard time codes to so timing devices
can correlate time information with network devices. The router integrated GPS provides the time
information that is provided by this interface.
Note The IRIG-B timing port supports timing output only.
Specifications
USB Ports
Note Currently not supported. This hardware feature will be supported in a future software release.
Table 2-11 Supported IRIG Serial Time Code Formats
Format Modulations Carrier Frequency Code Expression Interface
B000 DC Level Shift (DCLS)
pulse-width coded
None BCD time of year,
CF and SBS
RS232/RS485
B120 Amplitude Modulation
(AM)
1kHz sine wave BCD time of year,
CF and SBS
50 ohms BNC
Specification Description
Connector type
SMB coaxial RF
Supported Code Formats
IRIG-B000 and B123