Testing the TX Matrix Fiber-Optic Array Cables

To test the fiber-optic array cables, you use the fiber-optic array loopback adapter that is shipped with the TX Matrix router (see Figure 1).

Figure 1: Fiber-Optic Array Loopback Connector and Loopback Adapter

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
2. Remove the dust cover from the loopback adapter by loosening the two hex screws with a 2.5-mm hex Allen wrench and pulling off the cover. Temporarily store the dust cover in a dust-free resealable plastic bag.
3. Remove the dust cover from the fiber-optic array cable connector that connects to T640-SIB-0. To remove the dust cover, loosen the thumbscrew and captive screw on the connector. (Use the supplied small slotted screwdriver to loosen the captive screw.) Temporarily store the dust cover in a dust-free resealable plastic bag.

   Warning: Do not look directly into a fiber-optic array adapter or a connector at the end of a fiber-optic array cable attached to an adapter. The fiber optics emit laser light that can damage your eyes.

4. Align the loopback adapter with the cable connector, and carefully press it into the connector until it stops. The loopback adapter and the cable connector are keyed to ensure proper mating.

   Note: The optics in a fiber-optic array cable connector are spring loaded, so you must continue to apply force to the loopback adapter while securing it to the cable connector.

5. Using a 2.5-mm ball hex driver, at least 4 in. long, partially tighten the upper and lower hex screws on the loopback adapter. Alternate between the upper and lower hex screws until the loopback adapter is secured to the fiber-optic array cable connector.
6. Enable the TX-SIB adapter receivers.
   user@host> request chassis sib slot slot-number start-receiver interface-number scc

   The slot number can be from 0 through 4 and corresponds to the TX-SIB chassis slot. The interface number can be 0 through 3 and corresponds to the TX-SIB adapters labeled LCC0 through LCC3.

7. Verify that the RX LED next to the TX-SIB adapter is steadily lit green.
8. Disable the TX-SIB adapter receivers.
   user@host> request chassis sib slot slot-number stop-receiver interface-number scc

   The slot number can be from 0 through 4 and corresponds to the TX-SIB chassis slot. The interface number can be 0 through 3 and corresponds to the TX-SIB adapters labeled LCC0 through LCC3.

9. Using a 2.5-mm ball hex driver, at least 4 in. long, partially loosen the upper and lower hex screws on the loopback adapter. Alternate between the upper and lower hex screws until the loopback adapter is removed from the fiber-optic array cable connector.
10. Remove a dust cover from the dust-free resealable plastic bag, and reinstall it on the fiber-optic array cable connector. Align the dust cover with the cable connector, and carefully press them together until they stop. The cover and the cable connector are keyed to ensure proper mating. Secure the dust cover by tightening the thumbscrew and captive screw on the connector. (Use the supplied small slotted screwdriver to tighten the captive screw.)
11. Repeat Step 3 through Step 10 for the fiber-optic array cables destined to T640-SIB-1 through T640-SIB-4. If the RX LED next to each of the five TX-SIB adapters was steadily lit green, proceed to Step 17.
12. If the RX LED next to any of the five TX-SIB adapters was not steadily lit green, disable the adapter receivers.

    To disable the adapter receivers, issue the request chassis sib slot stop-receiver scc and request chassis sib slot stop-receiver commands on the TX Matrix router and T640 router. For example, if you are disabling the adapters on TX-SIB-0 and T640-SIB-0, issue the following commands on the TX Matrix router and T640 router:

    user@host> request chassis sib slot 0 stop-receiver 0 scc

13. Remove the loopback adapter, and clean it and the fiber-optic array cable connector. For cleaning instructions, see Cleaning the TX Matrix and T640 Fiber-Optic Components Overview.
14. After you have cleaned the fiber-optic array cable connector and the loopback adapter, reconnect them as described in Step 4 through Step 5.
15. Enable the TX-SIB adapter receivers.
    user@host> request chassis sib slot slot-number stop-receiver interface-number scc

    The slot number can be from 0 through 4 and corresponds to the TX-SIB chassis slot. The interface number can be 0 through 3 and corresponds to the TX-SIB adapters labeled LCC0 through LCC3.

16. Verify the state of the RX LED as described in Step 6 through Step 7. If the RX LED next to the TX-SIB adapter is not steadily lit green, contact your customer support representative for additional instructions. Do not proceed with the installation of the TX Matrix router until you have spoken to your customer support representative.
17. Remove a dust cover from the dust-free resealable plastic bag, and reinstall it on the loopback adapter. Align the dust cover with the loopback adapter, and carefully press them together until they stop. The cover and the loopback adapter are keyed to ensure proper mating.
18. Secure the dust cover by tightening the hex screws, then store the loopback adapter in the dust-free resealable plastic bag.