The following two figures shows the dimensions of the air plenum relative to the cabinet or rack. The chassis can be installed with brackets in front position only. A minimum opening of This procedure installs the air plenum to orient the air flow from front-to- back direction in the ONS M6 shelf.
Security Level. Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement Before working on a chassis or working near power supplies, unplug the power cord on AC units. This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. When installing or replacing the unit, the ground connection must always be made first and disconnected last.
The air plenum is installed on a rack or a cabinet using thread-forming screws that remove any paint or non-conductive coatings inside the hole threads, and establish a metal-to-metal contact. Also, clean both surfaces outside the screw points that come in contact, so that they are free of paint and other nonconductive coating. Apply an appropriate antioxidant compound to the surfaces.
Depending on the rack or cabinet, complete the necessary task:. You have completed this procedure. Place the horizontal air plenum at the bottom of the shelf slot in the ANSI inch cabinet. Insert the wing head screws provided with the kit, and tighten to a torque value of Install the vertical air plenum to the left of the horizontal air plenum:.
Insert the vertical plenum in the free space between the horizontal plenum and cabinet. Install the wing head screws fom the internal side of the horizontal plenum as shown in the following figure. Install the vertical air plenum to the right of the horizontal air plenum. Follow step 3a to step 3c. Install the horizontal air plenum above the vertical plenums.
Install the inch standard brackets on both sides of the chassis in the front position. Check the length between the top and bottom horizontal air plenums where the chassis will be installed. The length must be not less than If the length is less, adjust the position of the top horizontal plenum. Install the ONS M6 empty chassis between the two horizontal plenums. Align the screws to fix the adapter plates to the shelf.
Insert the screws and tighten them to a torque value of Place the horizontal air plenum below the shelf slot in the ANSI inch cabinet or rack. Insert the vertical air plenum in the free space between the horizontal air plenum and cabinet. Install the wing head screws from the internal side of the horizontal plenum as shown in the following figure.
Install the vertical plenum to the right of the horizontal air plenum. Follow step 5a to step 5c. Place the horizontal air plenum above the shelf slot in the ANSI inch cabinet or rack. Install the wing head screws provided with the kit, and tighten to a torque value of Install ANSI inch standard brackets on both sides of the chassis in front position. Install the ONS M6 empty chassis between the horizontal plenums.
Install the ANSI inch adapter plates on the horizontal air plenums. Install the vertical air plenum to the left of the bottom horizontal plenum. Install the wing head screws from the internal side of the horizontal plenum and tighten the screws to a torque value of Follow step 4. Install the horizontal air plenum above the vertical air plenums. Install the pre-assembled air plenums in the ANSI inch rack or cabinet.
Install the empty ONS M6 chassis between the horizontal plenums. Place the horizontal plenum below the chassis slot in the ETSI cabinet. Place the horizontal plenum above the chassis slot in the ETSI cabinet. Install the standard brackets on both sides of the chassis in front position. The tables below summarizes the air flow performance of ONS M Prerequisite Procedures.
Stability hazard. The rack stabilizing mechanism must be in place, or the rack must be bolted to the floor before you slide the unit out for servicing. Failure to stabilize the rack can cause the rack to tip over.
This product requires short-circuit overcurrent protection, to be provided as part of the building installation. Install only in accordance with national and local wiring regulations.
Ensure that the protective device is rated not greater than: 40A and between This product relies on the building's installation for short-circuit overcurrent protection. Take care when connecting units to the supply circuit so that wiring is not overloaded. To prevent bodily injury when mounting or servicing this unit in a rack, you must take special precautions to ensure that the system remains stable.
The following guidelines are provided to ensure your safety:. To prevent airflow restriction, allow clearance around the ventilation openings to be at least:1 inch To comply with EN - Railway applications, Electromagnetic compatibility, a shielded cable must be used to connect to the EMS port. This cable must be less than 30 meters in length and not placed in the 3 meter boundary, as defined in EN, Table 2, note 1.
To comply with EN - Railway applications, Electromagnetic compatibility, DC power cables must be less than 30 meter long. Complete the necessary task as applicable:. Complete the necessary rack mounting task as applicable:. Connect the chassis to the office ground. This task verifies the shelf for AC power module installation. Verify the position of the mechanical locking system on the rear side of the chassis. To use the AC power module, the screw must be close to the AC silk-screen text see the following figure.
Loosen the screw and move it to the left position towards the AC silk-screen text. Tighten the screw again to a torque value of 4 in-lb 0. This task verifies the shelf for DC power module installation. To use the DC power module the screw must be close to the DC silk-screen text see the following figure. Loosen the screw and move it to the right position towards the DC silk-screen text. Return to your originating procedure NTP. Use only the fastening hardware provided with the ONS M6 to prevent loosening, deterioration, and electromechanical corrosion of the hardware and joined material.
When mounting the ONS M6 in a frame with a nonconductive coating such as paint, lacquer, or enamel either use the thread-forming screws provided with the ONS M6 ship kit, or remove the coating from the threads to ensure electrical continuity. Align the mounting bracket screw holes against the shelf screw holes. Repeat steps 1 through 3 for the mounting bracket on the opposite side. The following figure shows mounting the brackets for a inch Align the screw holes on the right front air deflector with the screw holes on the right side of the chassis.
Place the left back air deflector flush chassis as shown in Diagram 2 of Figure 1. Do not mount the left back deflector exhaust air deflector , if these cards are to be installed in the ONS M6 shelf:. Use the standard brackets directly to mount the ONS M6 shelf. Align the screw holes on the left back air deflector with the screw holes on the left side of the chassis. Place the inch mounting bracket flush in the front position see Diagram 1 of Figure 2 or in the middle position see Diagram 3 of Figure 2 against the right side of the chassis.
Align the screw holes on the inch mounting bracket with the screw holes on the right side of the chassis. Place the inch mounting bracket flush in the front position see Diagram 1 of Figure 2 or in the middle position see Diagram 3 of Figure 2 against the left side of the chassis. Align the screw holes on the inch mounting bracket with the screw holes on the left side of the chassis. Place the mounting bracket flush against the shelf as shown in the following figure.
Place the right front air deflector flush against the right side of the chassis see the following figure. Place the left front air deflector flush against the left side of the chassis.
Do not mount the left front deflector exhaust air deflector , if these cards are to be installed in the ONS M6 shelf:. Align the screw holes on the left front air deflector with the screw holes on the left side of the chassis.
Place the right front air deflector flush against the right side of the chassis see Diagram 1 of Figure 1. Place the left back air deflector flush against the chassis as shown in Diagram 2 of Figure 1.
Align the screw holes of the left back air deflector with the screw holes on the left side of the chassis. Place the mounting bracket flush in the middle position see Diagram 1 of Figure 2 or the front position see Diagram 3 of Figure 2 against the right side of the chassis. Align the screw holes on the mounting bracket with the screw holes on the left side of the chassis. Place the mounting bracket flush in the middle position see Diagram 1 of Figure 2 or the front position see Diagram 3 of Figure 2 against the left side of the chassis.
The front-to-top air deflector configuration must be used only for the bottom most chassis in the rack. Do not install a fan tray exhaust side deflector on a chassis that is installed above a chassis with a front-to-top air deflector configuration. The front-to-top deflector configuration can be operated at a maximum of 50C at m altitude. It is recommended to maintain a space of one RU between two chassis in a rack for cable management. To install the mounting bracket with air deflectors front-to-top in the front position, perform Step 3 through Step To install the mounting bracket with air deflectors front-to-top in the middle position, perform Step 12 through Step Align the screw holes on the right front air deflector with the screw holes on right side of the chassis.
Place a mounting bracket flush against the left and right side of the chassis see Diagram 2 of Figure 1. Align the screw holes on the mounting bracket with the screw holes on the side of the chassis.
Place the left top air deflector flush against the chassis as shown in Diagram 3 of Figure 1. Align the screw holes with the screw holes of the left top air deflector and the chassis see Diagram 4 of Figure 1.
See Diagram 4 of Figure 1. Place the right front air deflector flush against the right side of the chassis see Diagram 1 of Figure 2. Insert M4 pan-head screws and tighten them to a torque value of Place the mounting bracket flush in the middle position on the right front air deflector see Diagram 2 of Figure 2.
Align the screw holes on the mounting bracket with the screw holes on the right front air deflector. Insert M4 flat-head screws and tighten them to a torque value of Place the left top air deflector flush against the left side chassis as shown in Diagram 3 of Figure 2.
Align the screw holes on the left top air deflector with the screw holes on the left side of the chassis. Place the mounting bracket flush in the middle position on the left top air deflector see Diagram 4 of Figure 2. Align the screw holes on the mounting bracket with the screw holes on the left top air deflector.
Place the right front air deflector flush against the right side of the chassis see diagram below. Place the mounting bracket flush in the middle or front position of the right front air deflector see Diagram 1 of Figure 2 or Figure 3. Place the mounting bracket flush in the middle or front position on the left side of the chassis see Diagram 2 of Figure 2 or Figure 3.
This task allows one person to mount the shelf on a rack. Verify that the proper fuse and alarm panel has been installed in the top mounting space.
If a fuse and alarm panel is not present, you must install one according to manufacturer instructions:. Ensure that the shelf is mounted on the appropriate rack equipment:. Lift the shelf to the desired position in the rack. If the rack is empty, place the shelf at the bottom of the rack. The placement of the shelf is dependent on where you want to install the new equipment in the rack. Align the screw holes on the mounting brackets with the mounting holes in the rack.
Using the Phillips Dynamometric screwdriver, install one mounting screw in each side of the assembly. Tighten the screw to a torque value of 22 in-lb 2. When the shelf is secured to the rack, install the remaining two mounting screws on either sides. This task allows two people to mount the shelf on a rack. If a fuse and alarm panel is not present, you must install one as per the instructions of the manufacturer:.
Have one person hold the shelf in place while the other person uses the Phillips Dynamometric screwdriver to install one mounting screw in each side of the assembly. Some optical input and output ports are monitored by means of photodiodes implemented both for power control and for safety purposes. An internal control manages VOA settings and functionality as well as photodiode detection and alarm thresholds.
The power at the main output and input ports is monitored through the use of "virtual photodiodes. This firmware calculates the power on a port, summing the measured values from all single channel ports and applying the proper path insertion loss then providing the TCC2 with the obtained value. COM Rx is the line input. The 15xx. Note For power specifications, refer to the "Card Power Requirements" section. Trx filter shape Each wavelength version of the card has a different part number.
Figure shows the AD-1C-xx. When the fibers are properly connected, the LED turns off. Table lists the AD-1C-xx. Rfx filter shape All SOP and within whole operating temperature range two connectors included.
VOA at minimum attenuation; all SOP and within whole operating temperature range two connectors included. See Table through Table for this information. The card bidirectionally adds and drops in two different sections on the same card to manage signal flow in both directions.
In this table, channel IDs are given rather than wavelengths. To compare channel IDs with the actual wavelengths they represent, see Table Figure shows the AD-2C-xx. Table lists the AD-2C-xx. There are eight versions of this card with eight part numbers. Figure shows the AD-4C-xx. Table lists the AD-4C-xx. COM Rx—xx. Rfx filter shape -1 dB bandwidth RfxBW 2.
Eight versions of this card with eight different part numbers—each version designed for use with one band of wavelengths—are used in the ONS DWDM system. This card can be used when there is asymmetric adding and dropping on each side east or west of the node; a band can be added or dropped on one side but not on the other.
Figure shows the AD-1B-xx. Table lists AD-1B-xx. All SOP and within whole operating environmental range; two connectors included. Table lists the range of wavelengths for the receive express band. Table AD-1B-xx. Two versions of this card with different part numbers—each version designed for use with one set of bands—are used in the ONS DWDM system. Figure shows the AD-4B-xx. Table lists the unit names, band IDs, channel IDs, frequencies, and wavelengths assigned to the two versions of the card.
Table lists AD-4B-xx. Table AD-4B-xx. Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. PDF - Complete Book 8. Updated: February 16, Chapter Contents 6. See the "4MD-xx. See the "AD-1C-xx. Go to this URL to visit the company store:. Both new and experienced users will benefit from these publications. Included are networking deployment and troubleshooting tips, configuration examples, customer case studies, tutorials and training, certification information, and links to numerous in-depth online resources.
You can access Packet magazine at this URL:. Current offerings in network training are listed at this URL:. Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. PDF - Complete Book 6. Updated: February 16, Chapter: About this Manual. Audience To use this publication, you should be familiar with Cisco or equivalent optical transmission hardware and cabling, telecommunications hardware and cabling, electronic circuitry and wiring practices, and preferably have experience as a telecommunications technician.
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Only unprotected traffic can be provisioned on a single-span link. Figure shows ONS s in a single-span link. Eight channels are carried on one span. The optical performance values are valid assuming that the sum of the OADM passive node insertion losses and the span losses does not exceed 35 dB. Figure Single-Span Link. A mesh network can be native or multiring. In a native mesh network Figure , any combination of four-degree and eight-degree mesh nodes can work together.
Four-degree mesh nodes transmit an optical signal in four directions, while an eight-degree mesh node transmits an optical signal in eight directions. In a mesh node, all wavelengths can be routed through four four-degree mesh node to eight eight-degree mesh node different optical line termination ports using a WXC-C card without any optical-electrical-optical OEO regeneration.
For nodes equipped with 32WSS cards, the maximum system capacity is 32 channels. Terminal sites are connected to the mesh network as a spur. In a multiring mesh network Figure , several rings are connected with four-degree or eight-degree mesh nodes. For nodes equipped with 32WSS cards, maximum system capacity is limited to 32 channels.
A terminal node is connected to a multiring node as a spur. Figure Multiring Network. The PSM card supports the following network topologies:. In this case, the maximum number of span links can be divided into three according to the DCN extension optical safety requirements.
The performance data is a general guideline based upon the network topology, node type, client cards, fiber type, number of spans, and number of channels. Table Supported Topologies and Node Types. SMF 1. E-LEAF 2. TW-RS 3. Amplifier software uses a control gain loop with fast transient suppression to keep the channel power constant regardless of any changes in the number of channels. Amplifiers monitor the changes to the input power and change the output power proportionately according to the calculated gain setpoint.
The shelf controller software emulates the control output power loop to adjust for fiber degradation. In constant gain mode, the amplifier power out control loop performs the following input and output power calculations, where G represents the gain and t represents time. In a power-equalized optical system, the total input power is proportional to the number of channels.
The amplifier software compensates for any variation of the input power due to changes in the number of channels carried by the incoming signal. Amplifier software identifies changes in the read input power in two different instances, t1 and t2, as a change in the traffic being carried. The letters m and n in the following formula represent two different channel numbers. Amplifier software applies the variation in the input power to the output power with a reaction time that is a fraction of a millisecond.
This keeps the power constant on each channel at the output amplifier, even during a channel upgrade or a fiber cut. The per-channel power and working mode gain or power are set by automatic node setup ANS. The provisioning is conducted on a per-side basis. Starting from the expected per-channel power, the amplifiers automatically calculate the gain setpoint after the first channel is provisioned.
An amplifier gain setpoint is calculated in order to make it equal to the loss of the span preceding the amplifier itself. After the gain is calculated, the setpoint is no longer changed by the amplifier. Amplifier gain is recalculated every time the number of provisioned channels returns to zero. If you need to force a recalculation of the gain, move the number of channels back to zero.
Amplifiers are managed through software to control changes in the input power caused by changes in the number of channels. The software adjusts the output total power to maintain a constant per-channel power value when the number of input channel changes. Changes in the network characteristics have an impact on the amplifier input power.
Changes in the input power are compensated for only by modifying the original calculated gain, because input power changes imply changes in the span loss. As a consequence, the gain to span loss established at amplifier start-up is no longer satisfied, as shown in Figure In Figure , Node 1 and Node 2 are equipped with booster amplifiers and preamplifiers.
The input power received at the preamplifier on Node 2 Pin2 depends on the total power launched by the booster amplifier on Node1, Pout1 n where n is the number of channels , and the effect of the span attenuation L between the two nodes.
Span loss changes due to aging fiber and components or changes in operating conditions. The power into Node 2 is given by the following formula:. The phase gain of the preamplifier on Node 2 GPre-2 is set during provisioning in order to compensate for the span loss so that the Node 2 preamplifier output power Pout-Pre-2 is equal to the original transmitted power, as represented in the following formula:. In cases of system degradation, the power received at Node 2 decreases due to the change of span insertion loss from L to L'.
As a consequence of the preamplifier gain control working mode, the Node 2 preamplifier output power Pout-Pre-2 also decreases. The goal of APC at the shelf controller layer is simply to detect if an amplifier output change is needed because of changes in the number of channels or to other factors. If factors other than changes in the number of channels occur, APC provisions a new gain at the Node 2 preamplifier GPre-2' to compensate for the new span loss, as shown in the formula:.
Generalizing on the above relationship, APC is able to compensate for system degradation by adjusting working amplifier gain or variable optical attenuation VOA and to eliminate the difference between the power value read by the photodiodes and the expected power value.
The expected power values are calculated using:. Channel distribution is determined by the sum of the provisioned and failed channels. Information about provisioned wavelengths is sent to APC on the applicable nodes during circuit creation. Information about failed channels is collected through a signaling protocol that monitors alarms on ports in the applicable nodes and distributes that information to all the other nodes in the network.
ASE calculations purify the noise from the power level reported from the photodiode. Each amplifier can compensate for its own noise, but cascaded amplifiers cannot compensate for ASE generated by preceding nodes. The ASE effect increases when the number of channels decreases; therefore, a correction factor must be calculated in each amplifier of the ring to compensate for ASE build-up.
APC is a network-level feature that is distributed among different nodes. An APC domain optically identifies a portion of the network that can be independently regulated. An optical network can be divided into several different domains, with the following characteristics:.
Inside a domain, the APC algorithm designates a master node that is responsible for starting APC hourly or every time a new circuit is provisioned or removed. If corrections are needed in different nodes, they are always performed sequentially following the optical paths starting from the master node.
Any power level fluctuation within the threshold range is skipped since it is considered negligible. Because APC is designed to follow slow time events, it skips corrections greater than 3 dB. This is the typical total aging margin that is provisioned during the network design phase.
After you provision the first channel or the amplifiers are turned up for the first time, APC does not apply the 3 dB rule. In this case, APC corrects all the power differences to turn up the node. To avoid large power fluctuations, APC adjusts power levels incrementally.
This is applied to each iteration until the optimal power level is reached. For example, a gain deviation of 2 dB is corrected in four steps.
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