Shelf and Backplane Hardware
This chapter provides a description of Cisco ONS 15600 shelf and backplane hardware. Card and cable descriptions are provided in Chapter 2, "Card Reference."
To install equipment, refer to the Cisco ONS 15600 Procedure Guide.
Chapter topics include:
•Customer Access Panel
•Alarm, Timing, LAN, and Craft Pin Connections
•Power Distribution Unit
•Power and Ground Description
•Cards and Slots
Note The Cisco ONS 15600 assembly is intended for use with telecommunications equipment only.
Note The ONS 15600 is designed to comply with Telcordia GR-1089-CORE Type 2 and Type 4 equipment. Install and operate the ONS 15600 only in environments that do not expose wiring or cabling to the outside plant. Acceptable applications include Central Office Environments (COEs), Electronic Equipment Enclosures (EEEs), Controlled Environment Vaults (CEVs), huts, and Customer Premise Environments (CPEs).
1.1 Installation Overview
The ONS 15600 is a Network Equipment Building System III (NEBS III)-compliant, environmentally hardened shelf assembly that ships as a single shelf in a bay assembly for Release 6.0. The ONS 15600 comes with the power distribution unit (PDU), shelf, fans, and backplane already installed. The front door of the ONS 15600 allows access to the shelf assembly, fan-tray assembly, and cable-management area. The customer access panel (CAP) on the back of the shelf provides access to alarm contacts, external interface contacts, and timing contacts. Power and ground terminals are located on the top left and right sides of the bay.
Voltage to the alarm circuits should not exceed -48 VDC.
The ONS 15600 comes mounted in a custom, certified NEBS-2000 rack. The bay assembly, including the rack, fan trays, and PDU weighs approximately 500 pounds (226.8 kg) with no cards installed.
ONS 15600 OC-N cards have OGI connectors on the card faceplate; available connector termination types are SC, ST, and FC. Fiber optic cables are routed to the front of the OC-N cards.
The ONS 15600 is powered using -48 VDC power but may range from -40.5 to -72 VDC. Input power is accessible from the sides of the bay, and output power is accessible at the rear of the bay. Cisco supports dual office-power feeds only.
Install the ONS 15600 in compliance with your local and national electrical codes:
•United States: National Fire Protection Association (NFPA) 70; United States National Electrical Code
•Canada: Canadian Electrical Code, Part I, CSA C22.1
•Other countries: If local and national electrical codes are not available, refer to IEC 364, Part 1 through Part 7.
1.2 Bay Installation
In this chapter, the terms "ONS 15600" and "bay assembly" are used interchangeably. In the installation context, these terms have the same meaning. Otherwise, bay assembly refers to the physical steel enclosure that holds the shelves and power distribution unit (PDU), and ONS 15600 refers to the entire system, both hardware and software.
To install the ONS 15600, you must first unpack the bay assembly. Two custom ramps and two dollies are available to assist you with the removal of the bay from the shipping pallet and transportation to the installation location. Figure 1-1 shows the bay assembly with the dollies installed.
Figure 1-1 ONS 15600 with Dollies Installed
The ONS 15600 shelf measures 25 inches high, 19-9/16 inches wide, and 23 inches deep (63.5 cm H x 49.7 cm W x58.3 cm D). A maximum of three ONS 15600s can fit in a custom seven-foot equipment rack. The ONS 15600 that ships within a rack is 83-7/8 inches high, 23-5/8 inches wide, and 23-5/8 inches deep (213 cm H x 60 cm W x 60 cm D).
Note Cisco supports only one ONS 15600 shelf per bay in Software Release 6.0.
1.3 Front Door
The ONS 15600 features a door to the front compartment that you can open by releasing the latches on the bottom left and right sides of the door. The front door provides access to the shelf, cable-management tray, and fans (Figure 1-2).
Figure 1-2 ONS 15600 Front Door
You can remove the front door of the ONS 15600 to provide unrestricted access to the front of the shelf. A label is pasted in a box in the center of the swing-down door that covers the fiber routers (Figure 1-3). This label designates the position of the rack and shelf in a lineup.
Figure 1-3 Bay Label
The front door also has a Class I laser warning (Figure 1-4).
Figure 1-4 Laser Warning Label
1.4 Rear Covers
The ONS 15600 has an optional plastic rear cover that is held in place with six 6-32 x 3/8 inch Phillips screws. This plastic cover provides additional protection for the cables and connectors on the backplane (Figure 1-5).
Figure 1-5 Plastic Rear Cover
Figure 1-6 shows the bus bar covers.
Figure 1-6 PDU Bus Bar Cover
1.5 Cable Routing
The narrow and wide cable routing modules (CRMs) can be installed on the sides of the bay to manage and contain the optical cables as they are routed away from the bay. You can use both types of fiber routing systems with overhead or under-floor cabling.
1.6 Customer Access Panel
The Customer Access Panel (CAP) is located in the middle of the rear of the shelf. The CAP provides an alarm pin field, timing, and LAN connections. The CAP plugs into the backplane using 2mm Hard Metric connectors with 752 pins and is held in place with one large captive bolt and multiple screws. Figure 1-7 shows the location of the CAP on the back of the shelf.
Note Only T1 (100 ohm) building integrated timing supply (BITS) is supported in Software R6.0.
Figure 1-7 Rear of the ONS 15600, Including the CAP
The ONS 15600 CAP provides the following:
•BITS T1 (100 ohm) interfaces via wire-wrap pins.
•Two Ethernet interfaces via RJ-45 connectors with internal transformer isolation.
•An EIA/TIA-232 craft interface via DB-9 connectors. This interface is surge-protected and provides EMI filtering. Two interfaces are provided for redundancy.
•Four audio alarm interfaces via a DB-15 connector that is surge-protected and EMI-filtered. The audio alarm indication is provided by the Timing and Shelf Controller (TSC) card and this interface can receive a signal to disable the audio alarm.
•Four visual alarm interfaces via a DB-15 connector that is surge-protected and EMI-filtered. The visual alarm indication is provided by the TSC card and the signal is connected to the PDU where LEDs indicate the alarm status and severity.
•Environmental (external) alarms and controls (16 inputs and 16 outputs) via wire-wrap pins. The interface is surge-protected and provides isolation by using an opto-isolator for alarm inputs and relays for alarm outputs. By connecting to different wire-wrap pins on the CAP, the alarm outputs can be configured for either normally open (NO) or normally closed (NC) operation. Alarms are initiated by shorting these contacts. The alarm input interface provides a pair of positive and negative wire-wrap pins.
The isolation and termination meet the intra-building lightning surge specified in Telcordia GR-1089. The CAP has -48 VDC monitoring with I2C interface and nonvolatile memory to store the CAP revision information.
Figure 1-8 shows the CAP faceplate.
Figure 1-8 CAP Faceplate and Connections
If the CAP fails, the node raises an EQPT alarm. You can replace the CAP on an in-service system without affecting traffic. To replace a CAP, refer to the Cisco ONS 15600 Troubleshooting Guide. Always replace the CAP during a maintenance window.
1.7 Alarm, Timing, LAN, and Craft Pin Connections
Always use the supplied ESD wristband when working with a powered ONS 15600 or any ONS 15600 components. Plug the wristband cable into one of the ESD jacks located on the lower-left outside edge of the bay assembly and at the bottom rear of the shelf.
The ONS 15600 has a backplane pin field located at the bottom rear of the shelf that is part of the CAP. The CAP provides 0.045 square inch (0.290 square centimeter) wire-wrap pins for enabling alarm inputs and outputs and timing input and output. This section describes the backplane pin field and pin assignments, as well as timing and LAN connections. See the "Customer Access Panel" section for more information.
1.7.1 External Alarm and Control Contact Installation
The external (environmental) alarm contacts consist of the wire-wrap pin field and two D-Sub 15s. The alarm pin field supports up to 16 alarm inputs (external alarms) and 16 alarm outputs (external controls). The two D-Sub 15s support four audible alarms, four visual alarms, one alarm cutoff (ACO), a PDU Fail A, and a PDU Fail B.
By connecting to different wire-wrap pins on the CAP, the alarm outputs can be configured for either normally open (NO) or normally closed (NC) operation (see Figure 1-9). The alarm inputs consist of two wire-wrap pins on the CAP and the alarm outputs consist of three wire-wrap pins.
22.214.171.124 Visual and Audible Alarms
Visual and audible alarm contacts are provisioned as Critical, Major, Minor, and Remote. Figure 1-9 shows alarm pin assignments.
Figure 1-9 Alarm Pin Assignments on the CAP
Visual and audible alarms can be wired to trigger an alarm light at a central alarm collection point when the corresponding contacts are closed.
126.96.36.199 Alarm Cutoff and PDU Alarms
The PDU Alarm connection controls the visual alarm indicators on the front of the PDU. You can also activate the alarm cutoff (ACO) function by pressing the ACO button on the TSC card faceplate. The ACO function extinguishes all audible alarm indications, but the alarm is still raised in Cisco Transport Controller (CTC).
1.7.2 Timing Installation
The ONS 15600 backplane supports two 100-ohm BITS clock pin fields. Figure 1-10 shows the pin assignments for the BITS timing pin fields.
Note Refer to Telcordia SR-NWT-002224 for rules about provisioning timing references.
Note 64K and E1 timing are not used with SONET systems.
Figure 1-10 BITS Timing Connections on the CAP
See Chapter 6, "Timing" for more information.
1.7.3 LAN Installation
Use a straight-through LAN cable with the LAN port on the ONS 15600 CAP to connect the ONS 15600 to a hub, switch, or a LAN modem for remote access to the node. Use a crossover cable when connecting the CAP to a workstation. You can also use a straight-through or crossover LAN cable with the LAN port on the active TSC faceplate to connect directly to the local ONS 15600.
Note Do not use the LAN port on the active TSC for remote monitoring because you will lose connectivity to the node if the other TSC in the shelf becomes the active TSC.
1.7.4 TL1 Craft Interface Installation
To open a TL1 session using the craft interface on a PC, use the RJ-45 port on the active TSC card to access the system using a standard web browser. If a browser is not available, you can access the system using one of the two EIA/TIA-232 ports on the CAP. Each EIA/TIA-232 port supports VT100 emulation so that you can enter TL1 commands directly without using a web browser. Because the CAP EIA/TIA-232 port is set up as a data terminal equipment (DTE) interface, you must use a 3-pair swapping null modem adapter when you are working in a UNIX or PC environment so that the TXD/RXC, DSR/DTR, and CTS/RTS pins are swapped. Use a standard pin D-sub cable when connecting to a PC. Refer to the Cisco ONS 15600 TL1 Command Guide for more information.
Note Do not use the LAN port on the active TSC for remote monitoring because you will lose connectivity to the node if the other TSC in the shelf becomes the active TSC.
1.8 Power Distribution Unit
The PDU consists of a mounting chassis, A- and B-side power modules, an alarm module, and a rear I/O unit. The ONS 15600 PDU has LEDs that alert you to Critical, Major, Minor, and remote alarms on the node. Each module can support three 100A input power feeds, 48 VDC power load (based on a fully loaded ONS 15600 shelf). The PDU supplies six 50A power feeds to the shelves. (The PDU provided with the ONS 15600 is capable of supplying power to up to three shelves.)
A three-shelf bay at the minimum operational voltage of -36 VDC requires 69-A per feed (207 A total). A three-shelf bay at the nominal operational voltage of -48 VDC requires 52-A per feed (156 A total). Each of the three feeds should be protected by its own 100-A breaker. A bus bar system, rather than wiring, provides a reliable, low resistance path to the ONS 15600 shelf. Figure 1-6 shows the PDU output covers found at the top rear of the bay.
Note Cisco supports only one ONS 15600 shelf per bay in Software R6.0.
1.9 Power and Ground Description
Ground the equipment according to Telcordia standards or local practices. The ground connection is located on the front of the bay's top horizontal rails. The ONS 15600 provides two #12 tapped holes to accommodate the grounding lug. The lug must be a dual-hole type and rated for at least 125-A capacity. Figure 1-11 shows the front and rear bay ground holes.
Figure 1-11 Front and Rear Bay Ground Holes
The main power connections are made at the PDU side terminals at the top of the bay. To install redundant power feeds, use four power cables and ground cables. For a single power feed, only two power cables and one ground cable (all rated for at least 125-A capacity) are required. Use a conductor with low impedance to ensure circuit overcurrent protection. The ground conductor must have the capability to safely conduct any faulty current that might be imposed.
Cisco recommends the following wiring conventions, but customer conventions prevail:
•Red wire for battery connections (-48 VDC)
•Black wire for battery return connections (0 VDC)
•The battery return connection is treated as DC-I, as defined in Telcordia GR-1089-CORE, issue 3
The ONS 15600 shelf has redundant -48 VDC power terminals on its backplane. The terminals are labeled A FEEDS and B FEEDS and are located at the top left and right sides of the shelf behind clear plastic covers.
1.10 Fan-Tray Assembly
The fan-tray assembly is located at the top of the ONS 15600 shelf front compartment. The fan-tray assembly has three removable drawers that hold two fans each and fan-control circuitry for the ONS 15600 (Figure 1-12). You should only need to access the fans if a fan fails.
Figure 1-12 Fan-Tray Assembly
1.10.1 Air Filter
The ONS 15600 contains a reusable air filter that is made of an open-cell polyurethane foam that is flame retardant and fungi resistant. The air filter is located above the three fan trays (Figure 1-13). This disposable filter is designed to be cleaned using only mild detergents. You can order air filter replacements from Cisco Systems (P/N 700-13116-05). Keep spare filters in stock. Refer to the Cisco ONS 15600 Procedure Guide for information about replacing the fan-tray air filter.
Inspect the air filter every 30 days, and clean the filter every three to six months. Replace the air filter every two to three years. Avoid cleaning the air filter with harsh cleaning agents or solvents.
Do not operate an ONS 15600 without a fan-tray air filter. A fan-tray filter is mandatory.
Figure 1-13 Air Filter and one Fan Tray Pulled Out
1.10.2 Fan Speed and Failure
If one or more fans fail on the fan-tray assembly, replace the fan tray where that fan resides. You cannot replace individual fans. The red FAN LED on the front of the fan tray turns on when one or more fans fail. For fan-tray replacement instructions, refer to the Cisco ONS 15600 Procedures Guide. The red FAN LED clears after you install a working fan tray.
If both fans in the center fan tray are inoperative, you must replace the fan tray within five minutes of failure to avoid affecting traffic because CTC software will shut down one of the single shelf cross-connect (SSXC) cards.
The ONS 15600 requires at least one working fan in each of the three fan trays. When a single fan in a tray fails, Cisco recommends replacing the tray with a fully working tray as soon as possible.
Note Each fan tray contains two fans. The FAN LED indicates if one or both fans fail in that fan tray.
Fan speed is determined by card temperature sensors that report temperature data to the active TSC card. The sensors measure the input and output air temperature for each card. Fan speed options are low, medium, and high. For example, if a card exceeds permissible operational temperature, the fan speed increases appropriately. At initial turn-up, the default fan speed is high until the node initializes. If both TSC cards fail, the fans automatically shift to high speed. If a single TSC fails, the active TSC will still control the fan speed. Table 1-1 shows the power requirements for an individual fan in a fan tray.
Table 1-1 Power Requirements for an Individual Fan
Min at 48 V (ambient temperature less than 25 degrees C)
Max at 48 V (ambient temperature greater than 25 degrees C)
1.11 Cards and Slots
When a card is inserted in a card slot, it will contact the shelf backplane but is not fully installed until the ejectors are fully closed.
1.11.1 Card Slot Requirements
The ONS 15600 shelf has 14 card slots numbered sequentially from left to right. Slots 1 to 4 and 11 to 14 are reserved for optical (OC-N) traffic cards. These slots can host any of the ONS 15600 optical cards. Slots 6/7 and 8/9 are dedicated to SSXC cards, and Slots 5 and 10 house the TSC cards. Each card is keyed to fit only in an appropriate slot for that card. Unused card slots should be occupied by a filler card (blank faceplate).
Do not operate the ONS 15600 with a single TSC card or a single SSXC card installed. Always operate the shelf with one active and one redundant standby TSC card and two SSXC cards.
Shelf assembly slots have symbols indicating the type of cards that you can install in them. Each ONS 15600 card has a corresponding symbol. The symbol on the card must match the symbol on the slot.
Table 1-2 shows the slot and card symbol definitions.
Table 1-2 Slot and Card Symbols
Any optical card (OC-48 and OC-192)
TSC slot; only install ONS 15600 cards with a square symbol on the faceplate
SSXC slot; only install ONS 15600 cards with a cross symbol on the faceplate
Refer to Chapter 2, "Card Reference," for more information about ONS 15600 cards.
All physical connections to the optical cards are made through OGI connectors on the card faceplate. Table 1-3 lists the number of ports and the line rates for ONS 15600 optical cards.
Table 1-3 Card Ports and Line Rates
OC48/STM16 LR/LH 16 Port 1550; OC48/STM16 SR/SH 16 Port 1310
4 physical interfaces; 4 ports per interface, totalling 16 OC-48 ports per card
2488.32 Mbps (STS-48, STS-48c)
OC192/STM64 LR/LH 4 Port 1550;
OC192/STM64 SR/SH 4 Port 1310
4 physical interfaces; 1 port per interface, totalling 4 OC-192 ports per card
9.95 Gbps (STS-192, STS-192c)
1.11.2 OGI Cables
The ONS 15600 faceplate has OGI connectors that terminate in either SC, ST, or FC connectors. Figure 1-14 shows the OGI to SC cable breakout for the OC-48 card.
Figure 1-14 OGI Cable Breakout
Figure 1-15 show the OGI pin breakout for the OC-48 card.
Figure 1-15 OGI Pin Breakout
1.11.3 Optical Card Cable Routing
The ONS 15600 has a cable-management tray with discrete fiber routing paths for each optical card's cables. Each fiber routing path has a plastic cable latch for securing the cables in the fiber routing path. You can rotate the cable latch into two positions, open or closed; make sure that the cable latch is always completely open before you insert or remove the optical cables. Make sure all fiber-optic cables are disconnected from a card before you remove it.
1.11.4 Card Replacement
To replace an ONS 15600 card with another card of the same type, you do not need to make any changes to the database; remove the old card and replace it with a new card. You can use the CTC Change Card feature to replace a card with a new card while maintaining all existing provisioning. To replace a card with a card of a different type, delete the original card from CTC, physically remove the card, and replace it with the new card.
Removing any active/working card from the ONS 15600 can result in traffic interruption. Use caution when replacing cards and verify that only inactive or standby cards are being replaced. If the active card needs to be replaced, switch it to standby prior to removing the card from the node.
Note An improper removal (IMPROPRMVL) alarm is raised whenever a card pull is performed, unless the card is deleted in CTC first. The alarm will clear after the card replacement is complete. If the alarm does not clear, refer to the Cisco ONS 15600 Troubleshooting Guide "Alarm Troubleshooting" chapter for more information.