Site Preparation

The following tools should cover most typical CBA1048 installations:

• Screwdrivers:
  • Medium slot (3/16 to 1/4 inch)
  • Numbers 0, 1, and 2 Phillips
  • Number 2 Robertson square drive
  • Large slot (1/2 inch) - one with a very long shaft (>13 inches) will be handy for tightening the thumbscrews on the right side of the Wall- Mount Swing Rack, particularly in installations with limited clearance on the right side.
• Driver bits to fit the wood or machine screws, or masonry anchor screws that will be used in mounting the swing rack to a wall or other surface
• Power drill and drill bits of a type and size appropriate for screw pilot holes, and masonry anchor holes (depends on fastener selection)
• Nut driver, 5/16-inch
• Small torpedo level (6 to 12 inches long)
• Wire cutters and strippers
• Wire-wrap/unwrap tools
• Wire terminal crimping tool
• Scissors suitable for cutting paper
• Digital multimeter with test leads (one with only basic functions is OK)

Supplies

The following supplies should cover most typical CBA1048 installations (supplies are locally sourced):

• Fasteners - select screws, and masonry anchors of the appropriate size for the Wall-Mount Swing Rack weight (about 40 pounds (18.1 kg, maximum)) and wall material. Make sure that the screw heads are large enough so they do not pull through the mounting holes of the hinge leaf or of the mounting brackets.

  Note: It is a good idea to use the largest size fasteners that will fit through the mounting holes of the swing rack (1/4 inch). If lag screws are used, make sure they are threaded through their entire length.

• Scotchlok-type in-line splices and taps, and crimp end terminals (and appropriate crimping tools) to make DC supply connections
• Heavy-gauge (AWG 10 to 12) stranded grounding wire (green/yellow)
• 18 AWG stranded wire, red, black, and green
• Ring and spade crimp terminals (AWG 10 to 12 - yellow)
• Ring, spade, and butt splice crimp terminals (AWG 18 to 22 - red)
• Cable ties (Nylon and Velcro), vinyl electrical tape, painter’s masking tape
• Wire staples or other wire attachments appropriate to the wall material
• Sharpie or other fine-point permanent marker, carpenter pencil

Signal Wires and Cables

Various wires, cables, and jumpers may be needed to connect the CBA1048 plug-in cards to each other and to nearby equipment, depending on the services installed in the CBA1048. Determine what wires and cables will be needed beforehand and arrive at the site with them. A typical list appears below:

• Transport
  • Copper: 22 to 24 AWG wire
  • Fiber: Single-mode fiber cable, terminated appropriately
• Subscriber
  • Copper: 22 to 24 AWG shielded cable for POTS circuits terminated with RJ21 connectors
• Alarm output cable (optional): Copper, 4-pair typical

Unpacking and Checking

The Tellabs CBA1048 and related accessories to be installed may arrive in a single shipping container, in multiple containers, or fully assembled in a single box. When unpacking the boxes, check the contents against the installation work order and check each item for obvious shipping damage.

If a shortage or damage is found, contact the Tellabs Technical Assistance Center (TAC) immediately.

If all items are accounted for and in good condition, installation can proceed.

It is a good idea to unpack and check everything before arriving at the installation site, if possible.

Site Selection

The Tellabs 1048 CBA is typically installed in either a standard equipment rack using an optional equipment rack mounting bracket, or in the optional Wall- Mount Swing Rack accessory. In either case, the CBA1048 must be located within about five feet of a power source (AC or DC) and close enough to related equipment for available cabling to reach.

Site Requirements

The facility grounding system must comply with EIA/TIA-607 Grounding and Bonding Requirements for Telecommunications in Commercial Buildings, United States Department of Agriculture Rural Utilities Service (RUS) Bulletin 1751F-810, and/or local practices, as applicable.

When installed in a standard equipment rack, the CBA1048 and related accessories typically will be grounded to the rack. Ensure that the rack is properly connected to the facility grounding system.

When installed in the Wall-Mount Swing Rack, the CBA1048 and related accessories will be grounded to the swing rack, which must, in turn, be properly connected to the facility grounding system.

Grounding

The facility grounding system must comply with EIA/TIA-607 Grounding and Bonding Requirements for Telecommunications in Commercial Buildings, United States Department of Agriculture Rural Utilities Service (RUS) Bulletin 1751F-810, and/or local practices, as applicable.

When installed in a standard equipment rack, the CBA1048 and related accessories typically will be grounded to the rack. Ensure that the rack is properly connected to the facility grounding system.

When installed in the Wall-Mount Swing Rack, the CBA1048 and related accessories will be grounded to the swing rack, which must, in turn, be properly connected to the facility grounding system.

DC Power

When the CBA1048 is installed in a standard equipment rack, power will typically come from an existing -48-VDC supply in the room. The optional DC/Alarm Cable Assembly connects to an existing fuse or circuit breaker panel in or near the rack, fed from the existing -48-VDC supply.

The DC power supply must be able to provide up to a maximum of 11 amps for the CBA1048, installed plug-in cards, and the Fan Tray. Two separate -48-VDC power supplies/fuse panels can be used for power redundancy.

AC Power

When installed in the optional Wall-Mount Swing Rack, power for the CBA1048 will typically come from the optional Rectifier Shelf mounted in the top position of the swing rack. One or two Rectifier Modules can be installed in the Rectifier Shelf.

One standard AC line cord for each Rectifier Module installed connects the Rectifier Shelf to a nearby AC outlet. Each line cord is about 6 feet long. The optional DC/Alarm/Fuse Block Cable Assembly connects the CBA1048 backplane and Fan Tray to the Rectifier Shelf, and contains a fuse block with separate fuses for DC power A and DC power B.

Alarms

The CBA1048 collects the alarm output from the Fan tray and contains an alarm interface that uses normally-open alarm contacts rated 2 amps at 60 VDC. When a particular alarm condition exists, the CBA1048 closes the contact for that alarm. Wire-wrap pins on the rear surface of the backplane PCB allow external connections to the alarm contacts. Wiring from the CBA1048 alarm pins generally goes to a nearby alarm panel, which is sometimes part of a fuse or breaker panel.

Equipment Rack

Installing the CBA1048 in an equipment rack requires an optional Equipment Rack Mounting Bracket to fit in a standard rack (19" or 23") and uses 6 rack units of vertical space. While the CBA1048 is 4 RU high and the Fan Tray is 1 RU high, an additional 1 RU of empty space should be allowed below the Fan Tray to provide unobstructed airflow for the Fan Tray intake.

The typical equipment rack installation will use an existing -48-VDC power source and a nearby fuse or breaker panel. The installation location should be selected such that the DC Cable Assembly for the CBA1048 (about 6 feet long) will reach the fuse panel. Likewise, the installation location should be close enough to the other equipment to which it will be connected to allow available cable lengths to reach.

Wall Mount Swing Rack

The optional Wall-Mount Swing Rack can be attached to a wall or other surface that can support the 40-pound (18.1 kg) weight of the fully-loaded swing rack. A flat area of a wall that is approximately 14 inches tall by 29 inches wide is required. The installation location should be close enough to the other equipment to which it will be connected to allow available cable lengths to reach.

Typical swing rack installations will use -48-VDC power provided by a Rectifier Shelf and be cooled by a Fan Tray - both installed in the swing rack. The DC Power/Alarm/Fuse Block Cable assembly is intended for swing rack installations and includes a fuse block to protect the CBA1048 and Fan Tray.

Wall Materials

The ideal mounting surface is two layers of 3/4-inch plywood. This allows wood screws of adequate length to be used to hold the swing rack to the plywood. Other wood and wood-like materials may be suitable, but materials that do not hold screws well should be avoided (particle board, MDF).

Drywall should also be avoided unless the swing rack is attached to a piece of plywood, and the plywood is attached to a stud or studs (two studs are preferred) behind the drywall. Consider using countersunk machine hardware (nuts, washers, bolts) to attach the swing rack to the plywood so that the back surface of the plywood is flat.

Otherwise, use two layers of plywood and take care that the wood screws holding the swing rack to the plywood are not so long that they exit the rear surface of the plywood. Alternately, the ends of screws that exit the rear surface can be ground off.

Masonry may be suitable if it is sturdy, in good condition, and will hold anchors securely without cracking. Cured cast concrete and solid concrete blocks are best. Cinder block can be fragile and may crack when anchors are tightened.

Wall Area Required

The swing rack needs a clear, flat area on the wall (or other surface) that is about 14 inches tall and 29 inches wide to allow the rack to swing a full 90 degrees for best access to the rear of the CBA1048 backplane. The supplied paper template is this size when cut out with scissors.

There should be at least 19 inches of space in front of the wall to allow the rack to swing, and about an inch of empty space below the rack to allow good airflow into the Fan Tray intake.

In addition, the installation location should be within about 5 feet of an AC outlet (to power the Rectifier Module (s)) and be close enough to the other equipment to which it will be connected to allow available cable lengths to reach.