Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
ON THIS PAGE
 

Connect ACX7348 to External Devices

SUMMARY You configure and manage the ACX7348 router using a dedicated management channel. The Routing Engine in the ACX7348 router has a console port that you connect to using an Ethernet cable with an RJ-45 connector.

Connect an ACX7348 Router to a Management Console

Each ACX7348 router has a console port with an RJ-45 connector. Use the console port to connect the device to a management console or to a console server.

To connect the ACX7348 router to a management console:

  1. Connect one end of the Ethernet cable to the console port (labeled CON).
  2. Connect the other end of the Ethernet cable into the console server (see Figure 1) or management console (see Figure 2).
Figure 1: Connect the ACX7348 Router to a Management Console Through a Console Server Connect the ACX7348 Router to a Management Console Through a Console Server
Figure 2: Connect the ACX7348 Router Directly to a Management Console Connect the ACX7348 Router Directly to a Management Console

Connect an ACX7348 Router to a Network for Out-of-Band Management

You can monitor and manage the ACX7348 router by using a dedicated management channel. Use the management ports to connect the ACX7348 router to a network for out-of-band management.

Note:

You cannot use the management ports to perform the initial configuration of the ACX7348 router. You must configure the management ports before you can successfully connect to the ACX7348 router using these ports. See Perform Initial Software Configuration for ACX7348 Routers.

To connect an ACX7348 router to a network for out-of-band management:

  1. Connect one end of the cable to the management port labeled MGMT on the ACX7348 router.
  2. Connect the other end of the cable to the management PC (see Figure 3).
Figure 3: Connect an ACX7348 Router to a Network for Out-of-Band Management Connect an ACX7348 Router to a Network for Out-of-Band Management

Connect to 1-PPS and 10-MHz Timing Devices

Each ACX7348 router has two DIN 1.0/2.3 female connector ports that support 1 pulse per second (1‑PPS) and 10-megahertz (10-MHz) inputs and outputs for interface to external timing devices.

Note:

Ensure that you use a cable of 3 m or less in length for the 10-MHz and 1-PPS connectors.

To connect the DIN-to-BNC coaxial cable to the external clocking input port:

  1. Connect one end of the DIN-to-BNC coaxial cable to either the 1-PPS connector or the 10-MHz connector on the router.
  2. Connect the other end of the DIN-to-BNC coaxial cable to the 1-PPS or 10-MHz measurement equipment.
    Note:

    Ensure that the 10-MHz or 1-PPS source network equipment contains a low-voltage complementary metal oxide semiconductor (CMOS) or is compatible with low-voltage (3.3 V) transistor-transistor logic (TTL).

Connect an ACX7348 Router to a GNSS Antenna

Global Navigation Satellite System (GNSS) capability is essential for the Grand Master (GM) clock functionality. The ACX7348 router supports an internal GNSS receiver. A GNSS receiver receives signals from a navigation satellite constellation. The GNSS receiver gains precise phase and time information by processing these signals and delivers the information across the network.

You must install a GNSS antenna to ensure optimal signal reception. Juniper supports the Furuno AU-217 antenna. For information about installing the AU-217 antenna, see GNSS Antenna AU-217 Installation Procedure.

Note:

The supported voltage values for the GNSS antenna are 3.3 V and 5 V. The default supported voltage for the antenna is 5 V.
Note:

To order the Furuno AU-217 antenna and related accessories, see Accessories for Juniper Customers.

Before you connect an ACX7348 router to the external GNSS antenna:

To connect an ACX7348 router to a GNSS antenna, refer the topology depicted in Figure 4.

Gain and Noise Figure Calculation

To calculate the total gain and noise figure (NF), see GNSS Antenna Installation Appendix on the Furuno data download page.

Antenna Cable Specifications

The following topology (Figure 4) depicts the antenna cable connections with connector types. Use this topology as an example to install the antenna cables.

Figure 4: Antenna Cable Connections

Juniper has tested this topology with the following cables:

  • LMR400 (10-m segment) from TE Connectivity. For more information, see Figure 5.

  • LMR400 (100-m segment) from TE Connectivity. For more information, see Figure 6.

  • RG-58 (1-m segment) from TE Connectivity. For more information, see Figure 7.

You must ensure that you install a surge protector to protect the GNSS receiver from lightning surges. This topology uses TVA-03C surge protectors. For more information about the surge protectors, see Coaxial lightning arrestor TVA-03.

Figure 5: LMR400 (10-m Segment) Cable Specifications LMR400 (10-m Segment) Cable Specifications
Figure 6: LMR400 (100-m Segment) Cable Specifications LMR400 (100-m Segment) Cable Specifications
Figure 7: RG-58 (1-m Segment) Cable Specifications RG-58 (1-m Segment) Cable Specifications
Table 1: Electrical Characteristics of the LMR400 Cable

LMR400

Impedance

50 Ω

Frequency

DC-3GHz

Voltage rating

335 Vrms

Dielectric withstanding voltage

> 1000 V

Insulation resistance

> 5000 MΩ
Table 2: Electrical Characteristics of the RG58 Cable

RG58

Impedance

50 ± 2 Ω

Capacitance

100 pF/m

Velocity Ratio

66 %

Resistance

Inner Conductor- 36, 5 Ω/Km

Braid- 14 Ω/Km
Tension

Sheath and Spark testing- 4,0 kV

Cabling Guidelines

Follow these guidelines when you install cables:

  • Examine the cable end points and connectors for any bends or damage.

  • Check the electrical continuity of the cable for both inner and outer conductors.

  • Check for any electrical short in cables.

  • Inspect the cable outer sheath for any damage.