Configuring Multiservice IRIG-B Mode Port Parameters for CTP Bundles (CTP Menu)

Mode

Specifies that the bundle will run in IRIG-B mode.

Select IRIG.

Src/Dest

Specifies the direction of the circuit. Although the IP circuit connection through the network is full duplex, an IRIG-B circuit is a simplex application, and the interface can operate only in Rx or Tx mode and not both at the same time.

(Although the bundle is by default a full duplex IP connection, you can configure it for simplex to save network bandwidth.)

Specify yes or no to the question: Is this an IRIG-B source end (IRIG-B signal enters CTP)?

• Yes (y)—Sets direction to Rx. This end of the circuit recovers IRIG-B from the attached cable and generates IP packets toward the network.

• No (n)—Sets the direction to Tx. This end of the circuit accepts IP packets, extracts the IRIG-B data codes, and transmits IRIG-B signaling output onto the cable.

If the autonegotiation setting of the CTP Ethernet media and the far-end switch or router do not match, it is possible for the CTP Ethernet ports to be in a half-duplex state, although the duplex setting is not configurable and always assumed to be full-duplex on the CTP device. Starting with CTPOS Release 7.2, the half-duplex state at CTP network interface card (NIC) ports are acquired, regardless of the duplex setting configured on the far-end node. After the autonegotiation process is completed, if the CTP NIC cannot acquire full-duplex mode, then the interfaces are considered to be down and a log message is recorded in both the /var/log/messages directory and the syslog file stating that the interface is down due to a non-full duplex condition. You are prompted to verify the cable connection, speed, and duplex settings because the NIC link might be down.

IRIG Rate

Specifies the data rate on the IP connection.

Note the following about setting the IRIG rate:

• Unless network bandwidth is at a premium, we do not recommend that you change this value from the default of 16,000 bps.

• Although the IRIG information can be transported through the network at the minimum configured rate (1000 bps), a CTP bundle running at this rate is subject to high latency.

Enter a number from 1000 through 25,500 bps. The port speed must be a multiple of 100 bps.

Output High Level

This setting applies only if you set the direction of the port to Tx.

Specifies the high output level, which is measured in peak-to-peak voltage. This setting is based on a 50-ohm termination.

Enter a number from 0.00 through 7.85 volts peak-to-peak.

Output Low Level

This setting applies only if you set the direction of the port to Tx.

Specifies the low output level, which is measured in peak-to-peak voltage. This setting is based on a 50-ohm termination.

Enter a number from 0.00 through 7.85 volts peak-to-peak.