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This chapter provides procedures you can use to install a subtended network that connects to a subtending host multiplexer chassis in a Cisco 6130 NI-2 DSL access multiplexer (DSLAM).
 | Warning Only trained personnel should install, replace, or service this equipment. |
For additional compliance and safety information, refer to the Regulatory Compliance and Safety Information for the Cisco 6100 Series System document.
For detailed information on the following, refer to the Cisco 6130 DSLAM with NI-2 User Guide:
In this guide, the term subtending refers to the host chassis, and subtended refers to the downstream chassis in a subtended network.
Subtending has two important functions:
The subtending host chassis is the one that is connected directly to the ATM backbone. You can have more than one subtending host chassis in your subtending tree. The chassis at the top of the subtending tree is a subtending host.
You can subtend a chassis to three levels and up to 12 chassis, all connecting through one subtending host chassis to the ATM backbone (see Figure 6-1).
Figure 6-2 shows a typical OC-3 daisy chain topology.
When you install a subtended network, be sure that you follow the installation procedures in proper sequence. Table 6-1 lists installation steps in the order in which they should occur. Subsequent subsections describe the installation steps.
 | Caution Proper ESD protection is required whenever you handle Cisco digital subscriber line access multiplexer (DSLAM) equipment. Installation and maintenance personnel should be properly grounded using ground straps to eliminate the risk of ESD damage to the equipment. Modules are subject to ESD damage whenever they are removed from the chassis. |
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| 1NI = network interface |
Install and cable the chassis using one of the following configurations:
Coaxial connections for DS3 cabling are located on the DS3 system I/O card. The transmit and receive DS3 BNC connectors on the host DS3 system I/O card are connected to the transmit and receive DS3 BNC connectors on the subtended DS3 system I/O card (Figure 6-3).
Use the following steps to cable the DS3 system I/O card for subtending:
Step 1 On the subtending host chassis backplane, attach one end of a BNC cable to the transmit DS3 BNC connector (TX1) on the DS3 system I/O card.
Step 2 On the subtended chassis backplane, attach the end of the BNC cable used in Step 1 to the receive DS3 BNC connector (RX) on the DS3 system I/O card.
Step 3 Repeat Steps 1 and 2 for each connection between a subtending host chassis and a subtended node chassis. If you have one subtending host chassis with two subtending node chassis, the second subtending node chassis connects to the TX2 and RX2 DS3 BNC connectors on the DS3 system I/O card.
Table 6-2 lists the connectors and their designations on the system I/O card.
| DS3 Connector | I/O Card Designation |
|---|---|
| Trunk 1 | |
| J14 |
| J12 |
| Subtend 2 | |
| J10 |
| J8 |
| Subtend 3 | |
| J6 |
| J4 |
For OC-3 subtending, the connections are made from the front of the host and the subtend OC-3 NI-2 module. To cable the Cisco 6130 NI-2 DSLAM for OC-3 subtending, perform the following steps:
Step 1 Locate the trunk transmit (top) and receive ports on the front of the OC-3 NI-2 module.
Step 2 Connect the OC-3 fiber-optic cable from the host transmit port on the OC-3 NI-2 module to the receive port on the subtend OC-3 module.
Step 3 Connect the OC-3 fiber-optic cable from the subtend transmit port on the OC-3 NI-2 module to the receive port on the host OC-3 module.
Figure 6-4 shows the subtending connections between two Cisco 6130 NI-2 DSLAMs.
With no module installed in any of the chassis, apply power to the system by
| Caution If the modules are installed when you apply power to the system, you could damage the modules and the chassis. |
The power connections from the chassis to the fuse and alarm panel are wired as shown in Figure 5-12 or Figure 5-13. The power connections from the fan tray to the fuse and alarm panel are wired as shown in Figure 5-15 or Figure 5-16.
| Caution Check the polarity of the -48 VDC connections to each chassis by attaching a voltmeter with the minus lead on -48 RTN and the plus lead on -48 V_A. Ensure that the meter reads between -36 VDC and -60 VDC. If your voltmeter shows a positive voltage, the power inputs might be reversed. If the voltmeter shows a negative voltage that is out of the -36 VDC to -60 VDC range, check the power supply for failure or check for a blown fuse in the fuse and alarm panel. |
Verify that the fans are operational by checking the LED on the front of each fan.
The fans should be operational before you install the modules.
| Caution It is important that the chassis cooling fans run continuously. The system could suffer thermal damage if the fans stop running for more than 30 minutes. |
| Warning The power supply circuitry for the Cisco DSLAM equipment can constitute an energy hazard. Before you install or replace the equipment, remove all jewelry (including rings, necklaces, and watches). Metal objects can come into contact with exposed power supply wiring or circuitry inside the DSLAM equipment. This could cause the metal objects to heat up and cause serious burns or weld the metal object to the equipment. |
| Warning Do not reach into a vacant slot or chassis while you install or remove a module or a fan. Exposed circuitry could constitute an energy hazard. |
| Caution Proper ESD protection is required each time you handle Cisco DSLAM equipment. Installation and maintenance personnel should be properly grounded using ground straps to eliminate the risk of ESD damage to the equipment. Modules are subject to ESD damage each time they are removed from the chassis. |
If the chassis ships with modules installed, reseat the modules to verify the power connection. To reseat the modules, complete the following steps:
Step 1 Lift up on the ejector tab.
Step 2 As you lift up the ejector tab and gently apply pressure to the bottom of the faceplate, push the module into the slot.
Step 3 Push on the faceplate of each module to fully seat the module.
Step 4 After the module is fully seated in the slot, press down on the ejector tab to secure the module.
Step 5 After the brief self-test, verify that the STATUS LED is solid green.
Step 6 Using the same procedure, install the remaining modules.
| Caution Proper ESD protection is required each time you handle Cisco DSLAM equipment. Installation and maintenance personnel should be properly grounded using ground straps to eliminate the risk of ESD damage to the equipment. Modules are subject to ESD damage each time they are removed from the chassis. |
Install the Cisco 6100 NI-2 series modules in the following order to verify the power connection:
| Caution Installing the modules in the chassis with the power leads reversed can damage the modules. |
| Warning The power supply circuitry for the Cisco DSLAM equipment can constitute an energy hazard. Before you install or replace the equipment, remove all jewelry (including rings, necklaces, and watches). Metal objects can come into contact with exposed power supply wiring or circuitry inside the DSLAM equipment. This could cause the metal objects to heat up and cause serious burns or weld the metal object to the equipment. |
| Warning Do not reach into a vacant slot or chassis while you install or remove a module or a fan. Exposed circuitry could constitute an energy hazard. |
To install the chassis's ATU-C and NI-2 modules, follow these steps in the order shown:
Step 1 To install the ATU-C modules in the chassis, complete the following:
(a) Vertically align the module edge with the module guides at the top and bottom of slot 1 of the chassis.
(b) Lift up on the ejector tab.
(c) As you lift up the ejector tab and gently apply pressure to the bottom of the faceplate, push the module into the slot.
(d) Push on the faceplate of each module to fully seat the module.
(e) After the module is fully seated in the slot, press down on the ejector tab to secure the module.
(f) After the brief self-test, verify that the STATUS LED is solid green.
(g) Use the same procedure to install the remaining xTU-C modules. The xTU-C modules are installed in slots 1 through 8, 13 through 28, and 31 through 38.
Step 2 To install the NI-2 module in the chassis, complete the following:
(a) Inspect the NI-2 module. Verify that the daughter board is fully seated on the main board.
(b) Verify that slots 10 and 11 of the chassis have no bent pins.
(c) Vertically align the module edge with the module guides at the top and bottom of slot 10 of the chassis.
(d) Lift up on the ejector tabs.
(e) As you lift up the ejector tabs and gently apply pressure to the faceplate, push the module into the slot. Push on the faceplate of each module to fully seat the module.
(f) After the module is fully seated in slot 10, press down on the ejector tabs to secure the module.
For additional information on connecting the NI-2 module to the network, see the "Connect the NI-2 Module to the Network" section.
The blank faceplate installation is similar to the module installation.
See the "Install Blank Faceplates in Open Slots" section for installation steps.
For more information on NEBS requirements, refer to the Regulatory Compliance and Safety Information for the Cisco 6100 Series System document.
The NI-2 module provides three types of network connections:
See the "Connect the NI-2 Module to the Network" section in "Installing a Cisco 6130 NI-2 DSLAM with a POTS Splitter" for installation procedures and additional information for the OC-3c and DS3 network connections.
To achieve NEBS compliance, verify that the chassis front door is attached to the chassis and closed (see the "Close the Chassis Front Door" section in "Installing a Cisco 6130 NI-2 DSLAM with a POTS Splitter").
You can order and install an optional rear door for the back of the chassis. The rear door attaches to the back of the chassis and restricts access to the backplane and cable connectors. To keep cables from interfering with the opening of the rear door, the cables that come down from the top of the rack can be tie wrapped to the door-mounting brackets.
See the "Install the Rear Door (Optional)" section for instructions.
Posted: Mon Mar 6 07:10:03 PST 2000
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