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Wide Bank 28 Diagnostic Center

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Frequently-Asked Questions



I lost my password. How do I get the password cleared?   return to top

A: All Carrier Access products requiring a password clear must be sent to the Repair Center for a nominal fee of $250.00 per controller card. Units sent to Carrier Access are entitled to our routine refurbishment process, which includes:

Note: For about the same price, you may be able to cover your unit under a contract, allowing you to receive extended warranty (including the password clear) and 24x7 technical support. For more information, please visit our Customer Care Support Services Center.

How can I tell if my Wide Bank 28 is software-updatable?  return to top

A: At the CLI, if you enter the command "load" without receiving an error message, then your unit can be updated via TFTP or XMODEM. If you do receive an error, your unit contains EPROM software and cannot be updated via TFTP or XMODEM. Units that cannot be updated in the field can be updated by Carrier Access for a nominal fee.

Where do I get SNMP MIBs?  return to top

A: MIBs are available to download from the Carrier Access web site.

Are the external alarm contacts normally open or normally closed?  return to top

A: Wide Bank 28 external alarm contacts are normally open.

Are the Wide Banks field programmable?  return to top

A: Yes, by using a serial cable and laptop computer running a VT-100 terminal emulation program such as HyperTerminal.

Are two power supplies required if I have two controllers?  return to top

A: Yes, two power supplies are required. You can run for a short period of time on a single power supply as the power is bridged over the A controller to the whole unit. However, if the A controller is removed for any reason, the Wide Bank 28 will power down. If a single power supply is connected to the B side, the Wide Bank 28 will behave in the same manner only with the B controller supplying power to the unit. So if the B controller is removed, the unit will power down.

Can the Wide Bank 28 DS3 be migrated to STS-1 with a software flash?  return to top

A: Not at this time. To accomplish this migration, the DS3 controllers must be replaced with STS.

Can the Fan Faceplate Option (FFO) be added to a non-FFO Wide Bank 28?  return to top

A: Yes, however, new DS3 controller card(s) that has the power connector and slot cutout for the FFO to be mounted may need to be purchased.

Does the Wide Bank 28 support E1?  return to top

A: Yes. The Wide Bank 28 will support 21 E1 circuits with the use of seven 3-port E1 cards. An eighth card may be installed as a spare to provide 1:7 protection for the E1 circuits.

How do I connect to the management serial port on the Wide Bank 28?  return to top

A: Use a straight through 9-pin RS-232 cable and set your terminal emulator to 9600 baud, 8 data bits, parity to none, 1 stop bit and no flow control. The terminal type is VT100.

How many power inputs do I need if I have 2 controllers in the WB28 chassis?  return to top

A: You need an A & B -48vdc power input.

How many Wide Bank 28 units can be installed horizontally in one standard 7-foot rack?  return to top

A: For non-FFO units, install units in groups of four with one RU between each unit and four RUs between each group of four, maximum of four groups of four (16 total units). For FFO units, you can mount up to 40 units. Units can mounted without any space left between units.

How many Wide Bank 28 units can be installed vertically in one standard 7-foot rack?  return to top

For 19-inch racks, you can install up to 18 units in three groups of six using crossbars (Caerier Access part number 710-003. For 23-inch racks, you can install up to 24 units in three groups of eight using crossbars (Carrier Access part number 710-0004.

I have made changes to the Wide Bank 28 configuration, how do I mirror those same configuration changes on the standby controller?  return to top

A: There are two ways to copy the configuration of the active controller to the standby controller.

  1. Issue the copy command. This command would need to be entered any time changes are made to the active controller command.
  2. Issue the autocopy command to enable automatic copying of the configuration from the active controller to the standby whenever configuration changes are made. The Autocopy is defaulted as “on”.

Is the redundant DS3 card required for low speed protection?  return to top

A: No. The redundant DS3 card is not needed for low speed (DS1) protection.

Is there a model of Wide Bank 28 that can be powered by 115AC?  return to top

A: The Wide Bank 28 is designed to accept -48VDC only. You can use 115VAC to power the Wide Bank 28 using the AC to DC converter; part number 730-0016.

Does the Wide Bank 28 support E-1?  return to top

A: Currently, the Wide Bank 28 can be configured to multiplex up to 21 E-1s into a DS3.

What clock source setting should be used on the Wide Bank 28 DS3?  return to top

A: The clock source should be set to internal because the DS3 model is an asynchronous multiplexer. This allows the DS1s to be clocked independently.

What command can be used to view alarms and errors?  return to top

A: Issue the alarms command to view active major/minor alarms.

Issue the hour ds1 xx & hour ds3 to view performance errors.

What do the states on the High Speed (HS) LED mean?  return to top

Click here to view the High Speed Troubleshooting Flowchart.

What does the MSO (Maintenance Service Option) on the Quad T1 cards provide?  return to top

A: The MSO option divides the electronics and relay sections of the Quad DS1 card in separate sections called the MSO Electronics and MSO Relay cards. This allows the MSO Electronics card to be replaced while the MSO Relay card maintains the DS1 circuits by automatically switching the four DS1s to the spare card. After the MSO Electronics cards passes self test, the four DS1s are automatically switched back to the home card.

What DS3 framing methods are supported by the Wide Bank 28?  return to top

A: Wide Bank 28 will support either M23 or C-bit framing for the DS3.

What DS3 software has DS1 revertive capability, and what command turns it on or off?  return to top

A: DS3 software 2.20 or higher and the command is revertive ds1 on/off.

What external fuse should be used for the Wide Bank 28?  return to top

A: The external fuse should be a 3A slow blow fuse.

What gauge wire should be used for the power connections?  return to top

A: 14 AWG copper wire should be used for the power connections.

What is the default IP address for the Ethernet port?  return to top

A: The Wide Bank 28 default configuration does not have an IP address specified. Initial configuration must be completed through a serial connection.

What is the difference between the ds1 move and revertive ds1 commands?  return to top

A: The DS1 move command is a manual way of moving DS1 circuits to the spare Quad DS1 card. The revertive DS1 command, when set to on, will automatically move a DS1 circuit back to the home card after two minutes of error free operation. If three protective switches occur in 24 hours on the same DS1, then that circuit will be locked out and remain on the spare. To remove the lock out, issue the revertive ds1 reset command.

What is the DS1 protection switching scheme?  return to top

A: The Wide Bank 28 employs a 1:7 protection scheme; meaning there is one spare for every seven DS1s. See the following table for the DS1 protection matrix.

Interface Protection

DS1 1 by Spare 1
DS1 2 by Spare 2
DS1 3 by Spare 3
DS1 4 by Spare 4
DS1 5 by Spare 1
DS1 6 by Spare 2
DS1 7 by Spare 3
DS1 8 by Spare 4
DS1 9 by Spare 1
DS1 10 by Spare 2
DS1 11 by Spare 3
DS1 12 by Spare 4
DS1 13 by Spare 1
DS1 14 by Spare 2
DS1 15 by Spare 3
DS1 16 by Spare 4
DS1 17 by Spare 1
DS1 18 by Spare 2
DS1 19 by Spare 3
DS1 20 by Spare 4
DS1 21 by Spare 1
DS1 22 by Spare 2
DS1 23 by Spare 3
DS1 24 by Spare 4
DS1 25 by Spare 1
DS1 26 by Spare 2
DS1 27 by Spare 3
DS1 28 by Spare 4

What is the length of time the battery backup will sustain a Wide Bank 28?  return to top

A: The -48VDC battery backup unit will operate the Wide Bank 28 for 8-12 hours.

What is the power dissipation of the Wide Bank 28?  return to top

A: The power dissipation of the Wide Bank 28 is:
Fully Redundant with FFO: 36 Watts (123 BTU/hr)
Fully Redundant with non-FFO: 32 Watts (109 BTU/hr)
Single controller with redundant DS1s non-FFO: 22 Watts (75 BTU/hr)

What type of cable is used for the DS1s?  return to top

A: Two 32-pair DSX-1 cables are used for the DS1s. One is for transmit and the other is for receive. Male to Male AMP 64 pin connectors.

Will the Line Build Out (LBO) affect both transmit and receive?  return to top

A: No. LBO affects the transmit only

Will the Wide Bank 28 function with controllers at different software versions?  return to top

A: Yes, but is not recommended. Carrier Access strongly recommends that both controllers be at the same software version for normal operation.

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