ADTRAN 1xN User Manual

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Section 61190860L1-5B

Issue 2, January 2002

CLEI Code: NCM5NTDD_ _

1xN Remote Protection Switch Pro-Cap

Installation and Maintenance

CONTENTS

 

1.

GENERAL ................................................................

1

2.

INSTALLATION .......................................................

3

3.

CONFIGURATION ...................................................

4

4.

OPERATIONAL DESCRIPTION .............................

5

5.

NORMAL OPERATION ...........................................

6

6.

PROTECT OPERATION ...........................................

6

7.

PROTECTION SWITCH ...........................................

8

8.

SWITCHBACK ........................................................

10

9.

AUTO-PROTECTOPERATION ............................

11

10.

SPECIFICATIONS ..................................................

12

11.

MAINTENANCE .....................................................

12

12. WARRANTY AND CUSTOMER SERVICE .........

12

FIGURES

 

 

Figure 1.

1xN Pro-Cap....................................................

1

Figure 2. SCIM Card Elements ......................................

4

Figure 3.

Normal Operation ...........................................

6

Figure 4.

Arming Operation ...........................................

8

Figure 5.

Protect Operation ..........................................

10

Figure 6.

Switchover.....................................................

10

Figure 7. Total Access 3000 Auto-protectSwitching ..

11

TABLES

 

 

Table 1.

LED Indication ................................................

3

Table 2.

In-BandCommmands .....................................

7

Table 3.

Out-Of-BandCommands ................................

7

Table 4. In-BandEnable/Disable Protocol ...................

8

Table 5. In-BandProtection Switch Protocol ...............

9

Table 6. Out-Of-BandEnable/Disable Protocol ...........

9

Table 7. Out-Of-BandProtection Switch Protocol .......

9

Table 8. In-BandProtection Release Protocol ............

11

Table 9. Out-Of-BandProtection Release Protocol ...

11

Table 10.

Specifications ................................................

12

1. GENERAL

This practice provides installation and operational procedures for the ADTRAN‚ Remote 1xN Pro-Capprotection switchmulti-mounthousing (P/N 1190860L1). SeeFigure 1.Pro-Capinitiates remote switching of a DS1 or HDSL circuit to a standby line following detection of a fault. This eliminates the immediate need for a vehicle dispatch to investigate trouble or provide standby service. The shelf also accommodates DDS and ISDN technologies but without protection.

Figure 1. 1xN Pro-Cap

Pro-Capcan be used in conjunction with the ADTRAN Total Access® 3000 Carrier Class Broadband Multiservice Access

Platform, or any standard Office Repeater Bay (ORB) with T1 or HDSL to provide a Protection Switching Network Interface (PSNI).

The Pro-Caphousing accepts eight T200 type circuit cards or four dual slot T400DS-1,HDSL, or HDSL2 circuit cards. The unit is a wall mounted assembly that provides convenient access to CPE connections. The assembly incorporates a circuit board backplane that provides a choice of amphenol connector orwire-wrappins for facility wiringhook-up.

The Pro-Capaccepts-48VDC local power or a modular power supply that inserts into the POWER slot at the far right of the shelf. The power supply module includes an AC power cord that plugs into a standard 110 VAC grounded outlet.

The Switch Customer Interface Module (SCIM) can mount to either the left or right side of the Pro-Caphousing to facilitate access to all CPE connections.

61190860L1-5B Trademarks: AnySectionbrand names61190860L1and productnames-5,includedIssuein2thisdocument are1 trademarks, registered trademarks, or trade names of their respective holders.

The SCIM can be locally powered by -48VDC, or span powered from the standby unit in slot 8 if equipped for span power. Slide switch S1 selects between local or span power. CPE receive and transmit connections are either amphenol orRJ-48Cjacks.

Revision History

Issue 2 adds Auto-Protectinformation when thePro-Capis configured in a Total Access 3000 network.

Features

The 1xN Pro-Capincludes these features:

Protection module.

Compact and lightweight assembly that accommodates eight T200 mechanics or four T400 mechanics modules.

Reversible SCIM for right side or left side assembly.

Prewired backplane to minimize wiring errors and installation time.

Protect module can function as standard channel module.

Dedicated slot for modular power supply.

LEC facility connections are made by 25-pairAmphenol XMT/RCV connectors orwire-wrappins.

CPE connections are made to RJ-48Cmodular jacks or25-pairAmphenol XMT/RCV connectors.

Auto-ProtectSwitching with Total Access 3000 applications.

Swing open tinted Plexiglas front cover.

Available with key-lockingmetal cover (List 4 Option).

Includes standard 10-yearwarranty.

Physical Description

The 1xN Pro-Capconsists of four elements:

1.Mounting-Plate

The mounting-plateattaches to a customer premises backboard.

2.Shelf

The shelf has slots for seven channel modules, one standby (protect) module, and one power module, plus two external edge connectors for the SCIM. The power terminal strip has connections for power, alarm, and ground. The shelf attaches to the mounting-plate.

3.Switch Customer Interface Module

This module inserts into one of the SCIM edge connectors located on either side of the shelf. It has both amphenol and RJ-48Cinterface connections to the customer loop. Behind an access panel is a power connection terminal strip, a slide switch for either span or local power, protect ON/OFF switch, and a pushbutton for selecting individual module protection or resetting the protect configuration. Selection and status is indicated with associated LEDs on the SCIM front panel.

4.Housing Cover

The Plexiglas swing door housing cover encloses the shelf allowing viewing and access to the shelf modules.

Functional Description

During normal customer and network transmission, data is transported through the active modules in slots 1 through 7. The module in slot 8 is the standby (protect) unit. If a fault is detected on an active line a series of facility initiated manual commands switch the standby module to an active mode in place of the faulted unit. When the faulted unit malfunction is resolved another series of manually initiated commands (or the reset switch) returns it to active service and the standby unit is returned to standby status. The LED bank shows module status during normal and standby conditions. When circuit protection mode is disabled the Pro-Capunit can be used as a standard8-slotT200 mounting.

Auto-ProtectSwitching

When the Pro-Capis used in association with the ADTRAN Total Access 3000 platform, certain Total Access 3000 cards initiate an automatic protect function with thePro-Cap.These cards send the same protect enable/disable, arming, and switching codes as sent in the manual switching mode. ThePro-Capdoes not require configuration changes to support theauto-protectfeature. The same configuration supporting manual switching also supports automatic switching. Additional information is inSection 9 of this practice.

Listed here are Total Access 3000 cards that initiate the auto-protectcodes:

• H2TUC 1181112L5

• H2TUR 1222026L7

• H2TUR 1221026L7

2

Section 61190860L1-5,Issue 2

61190860L1-5B

Documentation associated with the listed cards provides information on implementing the auto-protectfunction.

LED Indication

Table 1 describes LED indication.

All LEDs OFF indicates no power to the SCIM.

All LEDs flashing red indicates the protect card is disabled and SCIM power is local -48VDC.

2.INSTALLATION

C A U T I O N !

SUBJECT TO ELECTROSTATIC DAMAGE

OR DECREASE IN RELIABILITY.

HANDLING PRECAUTIONS REQUIRED.

After unpacking the unit inspect it for damage. If damage is noted, file a claim with the carrier then notify ADTRAN. Refer to Warranty and Customer Service.

Mounting Procedure

The 1xN Pro-Capinstalls at the remote location using the following procedure:

NOTE

All component fasteners are spring-loaded,captured thumb screws.

1.Remove the housing from the shelf by unscrewing the two thumb screws on the side of the housing. The housing pulls out and away from the shelf.

2.Remove the shelf from the mounting-plateby unscrewing the thumb screw at the top center of the shelf bay. It is not necessary to remove the SCIM assembly unless its position is to be reversed to the other side of the shelf.

3.The shelf assembly lifts away from the mountingplate by disengaging the chassis tabs from the mounting-platesupport hooks.

4.Using the mounting-plateas a template, position themounting-plateat the desired location and mark four pilot holes. Ensure the unit is level and that cable plugs will reach their designated sockets.

5.Using an appropriate bit, drill the four pilot holes.

6.Align the mounting-plateto the pilot holes and attach to the wall with appropriate fasteners.

7.Reassemble the unit by reversing steps 1 through 3.

Cable Connections

Frame Ground

Both the shelf and SCIM have separate ground connections. Each must be connected to a known approved ground location. Verify metal to metal contact on all connections and ensure ground circuit continuity.

The shelf has various openings for wire route options along with tie-wrapanchor points and extrusions for securing cables and connectors.

Specific wiring arrangements are customer developed.

CAUTION

Transmit and receive loops to both facility and CPE have two connection schemes. Only one connection method is to be used, not both.

Facility Side

Amphenol Connection – The to-facilityandfrom-facilityamphenols can be eitherleft-sideorright-sideoriented.

Table 1. LED Indication

Slot LED

OFF

Flash Green

Solid Green

Flash Red

Solid Red

Flash Red/Green

 

 

 

 

 

 

 

1 - 7

Protect

Request to

Protect

Protect Card

In Protect

N/A

Deselected

Protect Enable

Enabled

Disabled**

Mode*

 

 

 

 

 

 

 

 

 

8 PROT

No Network

Protect

Protect In

Protect Card

N/A

Protect Card Armed

Signal

Activated

Standby

Disabled**

 

 

 

 

 

 

 

 

 

 

FAIL

Protect

N/A

N/A

Protect Card

Protect Failure

N/A

Operational

Disabled**

 

 

 

 

 

 

 

 

 

 

 

 

* Only one module at a time in slots 1 through 7 can be in Protect Mode. ** Protect switch S3 OFF.

61190860L1-5B

Section 61190860L1-5,Issue 2

3

Wire-Wrap– Theto-facilityandfrom-facilitywire-wrapsare an alternate method in lieu of the amphenol connections.

Customer Side

Amphenol Connection – The to-CPEandfrom-CPEamphenols should beleft-sideoriented to prevent SCIM panel removal interference after amphenol installation.

RJ-48C– These modular jacks are an alternate method in lieu of the amphenol connections.

-48VDC Terminal

Local DC power connects to terminal strip TB1 at the bottom of the shelf backplane. This power source is distributed across the backplane to slots 1 through 8 and can jumper to the SCIM TB1 to power the controller card.

NOTE

Both the shelf backplane and the SCIM card each have a TB1 terminal strip. This practice identifies the specific TB1 when referenced in the text.

3. CONFIGURATION

Shelf

There are no configuration selections on the shelf backplane. If -48VDC is connected to TB1 on the shelf card there is no need for the power card unless for a spare power source.

Power Card

The PWR card has an AC power cord that inserts into a standard 110 volt AC grounded wall outlet. When AC power is in use, local power should not be connected to TB1 on the shelf card. The PWR card also applies power to the same TB1 shelf terminals, which in turn can be jumpered to TB1 on the SCIM card.

Protect Card

The protect card can receive power from either the network (span) or from the backplane (-48VDC). To initiate the protect feature the card in slot 8 must support the technology of the channel cards that are enabled for protection. The protect card should also have span power capability to power the SCIM should that configuration be used.

Shelf Cards

Channel cards are individually configured to meet network or customer requirements. Certain cards only receive power from network span power. These cards do not have pin contacts for shelf power.

CAUTION

It must be determined if channel cards can receive both span power and shelf power. Some cards may malfunction under that condition.

SCIM Controller Card

Option switches on the SCIM controller circuit board are located behind an access panel. Remove the housing from the shelf to gain access to the panel’s thumb screw fastener (refer to Step 1 of the Mounting Procedure). SeeFigure 2 for SCIM Card connections, terminals, indication, and switches.

Figure 2. SCIM Card Elements

4

Section 61190860L1-5,Issue 2

61190860L1-5B

Span Power Switch S1

This switch selects between span power or local power.

SPAN – The SCIM receives power from the protect card in slot 8.

LOCAL – The SCIM receives power from local -48VDC to terminal strip TB1 on the SCIM card.

NOTE

Local -48VDC can be jumpered from the shelf TB1 terminals.

Protection Select/Reset Switch S2

The first function of this pushbutton switch enables or disables standby protection for individual slots (1 through 7). Protection for selected slots can be disabled if cards of a different technology occupy those slots, or to meet SLA agreements. Protection is selected using the following procedure:

1.Depress S2 for 5 seconds. Slot 1 LED will start to flash green; all other LEDs will be OFF. Release S2.

2.To enable protection for slot 1, press and release S2. Slot 1 LED will turn solid green and the LED for slot 2 will begin to flash.

3.To pass over a slot that is not to be protect enabled, wait several seconds while that slot’s LED is flashing. The LED turns OFF and the next LED begins to flash green.

4.Continue this process until the LEDs for all slots designated for protection are ON.

The protect configuration, once established, is maintained in memory.

The second function of this switch is to reset the protect configuration in the event the protect card was enabled to temporarily replace a malfunctioning shelf card. After the system is returned to normal, depressing S2 for a minimum 5 seconds resets the protect configuration stored in memory. Immediately release the pushbutton when the LEDs return to the protect configuration.

Protect Switch S3

This switch controls the protect feature.

ON – All standby and protect functions are active.

OFF – The standby module in slot 8 is cut through and detection circuitry disabled. If the standby card was supplying span power to the SCIM, all the LEDs will be OFF. If the SCIM was receiving local -48VDC power, all the LEDs will flash red.

NOTE

The protect card in slot 8 should have span power capability either permanent or as an enabled option.

Local Power

Terminal strip TB1 on the SCIM card accepts local -48VDC power. Installation requires that wiring (14 to 26 AWG) be routed from the back of the SCIM housing.

This arrangement is an alternative to span power the SCIM receives from the protect card. Slide switch S1 selects between span power or the -48VDC supply.

SCIM frame ground is attained through a separate ground terminal.

4. OPERATIONAL DESCRIPTION

The SCIM card is a component of the Pro-Capassembly that provides T1 drops to the customer through anRJ-48Cor Amphenol connector. The T1 1x7 Controller Card is an enhanced SCIM that also performs manual 1x7 protection switching on T1 (HDSL) services. The controller card is designed to function as a manual protection switch and does not have the capability to address an automatic protection switch function.

T1 protection switching is accomplished through two network elements:

Central Office Element (COE)

Remote Element (RE).

The COE functions as the master of the protection switching operation by initiating all commands. The RE will only respond to the COE commands. The controller card and a Network Interface Unit (NIU) represent the RE. A Digital Test Access Unit (DTAU), a Digital Cross-connect,or a T1 Test Set can represent the COE.

The controller card uses the card in slot 8 of the Pro-Capmounting as the standby service. The NIU in slot 8 will provide the appropriate physical layer interface to the network (i.e. HDSL2, HDSL, or T1 AMI) and4-WireT1 AMI physical layer interface to

61190860L1-5B

Section 61190860L1-5,Issue 2

5

the controller card. The controller card will continuously monitor the network receive T1 transmission service in slot 8 (i.e. standby line) for commands. Upon the receipt of these commands, the controller card will initiate the T1 service switchover from the requested line (1 through 7) to the standby line. The controller card when optioned for protect will conduct the following:

1.Monitor the incoming network signal to determine if the protect line is operational. If the line is operational the FAIL LED will be OFF. If no signal is present, the slot 8 PROT LED will be OFF and the FAIL LED will be ON.

2.Provide a loopback to the network as long as a transmit signal is not present from the CPE. If a signal is placed on the slot 8 CPE transmit to the network, the loopback will be released and normal transmission to and from the network can occur. Upon removal of the transmit signal, loopback will be activated.

The SCIM controller card can be locally or remotely provisioned to either enable or disable slot-switchingcapability. If a slot is protect enabled, when a switch request for that slot is received on the protect channel, the slot will switch. If the slot is protect disabled, it cannot be switched.

5. NORMAL OPERATION

Data is transported from the network to the customer through an assigned slot (slot 1 through slot 7). The standby line is transported through slot 8

(see Figure 3).

Normal Receive Path

The receive path is non-protectedand transformer coupled between the network and the customer. The receive path is monitored forin-bandor ESFbit-patterneddatalink messages. The receive path toward the network will be terminated with a 100 ohm resistor. This 100 ohm termination increases the reliability of T1 signal recovery and minimizes crosstalk. The receive path toward the customer will be an open termination.

Normal Transmit Path

The transmit path is non-protectedand transformer coupled between the network and the customer.

Passive Mode

The controller card can be configured to establish a passive transmission path by detecting a T1 signal from the customer. The transition from normal to passive mode will require the loopback to the network removed and the receive path to the customer to be reconnected.

Passive Mode to Normal Operation

The controller card will return to normal operation by detection of a loss-of-signalfrom the customer.

6. PROTECT OPERATION

Protect operation is defined as the transport of data from the network to the customer using a standby line connected to Slot 8. Communication between the COE and RE will be based upon in-bandorout-of-band(ESF datalink) commands. Upon detection of a fault on an active line, the controller card will not automatically switch the customer’s data onto the standby line. A remote provisioning command must be used to switch the customer’s data onto the standby line. Once the customer’s data is on the standby line,

 

CENTRAL OFFICE

 

CUSTOMER PREMISES

 

 

Office

 

 

DTWA

 

 

Repeater

 

 

 

DSX-1

Bay

 

NIU

CIM

 

 

 

 

 

 

Office Repeater

 

Main

 

 

 

 

 

CPE

 

< Live Traffic >

or

< Live Traffic >

 

 

 

HTU-C

 

 

 

DCS

T1

 

T1 / HDSL / HDSL2

Standby

 

 

Office Repeater

 

 

 

 

 

 

 

 

or

 

 

 

 

Idle >

HTU-C

Idle >

 

 

 

 

 

 

 

 

WECO D4

 

 

 

 

 

WESCOM 3192

 

 

 

NORMAL OPERATION

Figure 3. Normal Operation

6

Section 61190860L1-5,Issue 2

61190860L1-5B

this condition will be locked until a remote provisioning command orders the controller card to switch the customer data back onto the main line, or a signal failure of greater than 30 seconds occurs on the protect Slot 8.

Protect Receive Path

The receive path is non-protectedand transformer coupled between the network and the customer. The receive path is monitored forin-bandor ESFbit-patterneddatalink messages. The receive path will be a passive transmission path.

Protect Transmit Path

The transmit path is non-protectedand transformer coupled between the network and the customer. The transmit path will be a passive transmission path.

In-BandCommands

The in-bandcommands are based on a16-bitrepeating binary pattern. These patterns were selected to avoid random data replication and yellow alarm generation.In-bandcode qualifications involve receiving the codes for 5 contiguous seconds. Thein-bandcodes can be transmitted using SF/ESF framing or unframed. SeeTable 2 forin-bandcommands.

Out-of-BandCommands

The out-of-bandcommands are based on the ANSIT1.403-1995standard on T1 protection switching. ANSIT1.403-1995,Table 4, specifies the command and response messages for T1 protection switching.

Out-of-bandcode qualifications involve receiving the codes for greater than 4 consecutive messages. SeeTable 3 forout-of-bandcommands.

Table 2. In-BandCommands

Command

Hex

Binary Pattern

Pattern

 

 

 

 

 

Switch Arming

C440

1100 0100 0100 0000

 

 

 

Slot Enable

C540

1100 0101 0100 0000

 

 

 

Slot Disable

C640

1100 0110 0100 0000

 

 

 

Switch Release

C44F

1100 0100 0100 1111

 

 

 

Switch Activation

 

 

Code

 

 

 

 

 

Line 1

C441

1100 0100 0100 0001

 

 

 

Line 2

C442

1100 0100 0100 0010

 

 

 

Line 3

C443

1100 0100 0100 0011

 

 

 

Line 4

C444

1100 0100 0100 0100

 

 

 

Line 5

C445

1100 0100 0100 0101

 

 

 

Line 6

C446

1100 0100 0100 0110

 

 

 

Line 7

C447

1100 0100 0100 0111

 

 

 

Table 3. Out-Of-BandCommands

Command

Hex

Binary Pattern

Pattern

 

 

 

 

 

Switch Arming

18FF

0001 1000 1111 1111

 

 

 

Slot Enable

78FF

0111 1000 1111 1111

 

 

 

Slot Disable

7AFF

0111 1010 1111 1111

 

 

 

Switch Release

26FF

0010 0110 1111 1111

 

 

 

Switch Activation

 

 

Code

 

 

 

 

 

Reset

24FF

0010 0100 1111 1111

 

 

 

Line 1

42FF

0100 0010 1111 1111

 

 

 

Line 2

44FF

0100 0100 1111 1111

 

 

 

Line 3

46FF

0100 0110 1111 1111

 

 

 

Line 4

48FF

0100 1000 1111 1111

 

 

 

Line 5

4AFF

0100 1010 1111 1111

 

 

 

Line 6

4CFF

0100 1100 1111 1111

 

 

 

Line 7

4EFF

0100 1110 1111 1111

 

 

 

61190860L1-5B

Section 61190860L1-5,Issue 2

7

7. PROTECTION SWITCH

Remote provisioning for a protection switch can be accomplished by sending a specific sequence of in-bandorout-of-bandmessages. These remote provisioning commands are transmitted to the controller card from a remote test facility or a T1 test set at a DSX panel.

Arming

Arming the controller card prevents an inadvertent protection switch operation. The controller card can be armed with the presence of the appropriate in-bandorout-of-bandpattern on the network receive interface. Disarming the controller card can be accomplished with the presence of anin-band(11100) orout-of-band(ESF datalink) NIU loop down pattern on the network receive interface, a1-hourtime out, a protection switch, or a manual reset. SeeFigure 4 for arming activation.

In-BandSlot Enable/Disable Protocol

See Table 4 forin-bandslot enable/disable protocol.

 

CENTRAL OFFICE

 

CUSTOMER PREMISES

 

 

Office

 

 

DTWA

 

 

Repeater

 

 

 

DSX-1

Bay

 

NIU

CIM

 

 

 

 

 

 

Office Repeater

 

Main

 

 

 

 

 

CPE

 

< Live Traffic >

or

< Live Traffic >

 

 

 

HTU-C

 

 

 

DCS

T1

 

T1 / HDSL / HDSL2

Standby

 

 

Office Repeater

 

 

< Arming Code >

 

 

 

 

or

< Arming Codes >

 

 

 

 

HTU-C

 

 

 

 

 

WECO D4

 

 

 

 

 

WESCOM 3192

 

 

 

TEST

 

 

 

 

 

ARMING OPERATION

Figure 4. Arming Operation

Table 4. In-BandEnable/Disable Protocol

 

Step

COE In-Band

In-BandPattern

Controller Card

 

Command Patterns

 

 

 

 

 

 

 

 

 

 

 

 

1

Send Arming Code

C440 Hex

Loopback the Arming Code.

 

 

 

 

 

 

 

 

Send Slot Enable or

C540 Hex Enable

Loopback the Enable/Disable code for 5 Sec, then

 

2

No Sync for 5 Sec. Repeat until pattern is

 

Disable Code

C640 Hex Disable

 

 

removed.

 

 

 

 

 

 

 

 

 

 

 

 

Send Protection Line

 

Loopback the C44X code where X = line number

 

 

C44X Hex

for 5 Sec., then No Sync for 5 Sec. Repeat until

 

3

Switch C44X where X

 

X = Line Number

pattern is removed.

 

 

= line number

 

 

 

 

 

 

 

 

 

 

 

 

4

Remove Pattern

 

Slot is now Enabled or Disabled for protection

 

 

switching.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

Section 61190860L1-5,Issue 2

61190860L1-5B

In-bandProtection Switch Protocol

Out-of-BandProtection Switch Protocol

See Table 5 forin-bandprotection switch protocol.

See Table 7 forout-of-bandprotection switch

Out-of-BandEnable/Disable Protocol

protocol.

 

See Table 6 forout-of-bandslot enable/disable

 

protocol.

 

Table 5. In-BandProtection Switch Protocol

Step

COE In-Band

In-BandPattern

Controller Card

Command Patterns

 

 

 

 

 

 

 

1

Send Arming Code

C440 Hex

Loopback the Arming Code.

 

 

 

 

2

Send Protection Line

C44X Hex

Loopback the C44X code where X = line number.

 

Switch Code

X = Line Number

 

 

Slot Enabled

 

Perform switchover 5 seconds later. Loss of sync.

 

Slot Disabled

 

Continuous Loopback of the C44X code where X

 

 

 

= line number. No switchover and no loss of sync.

 

 

 

 

Table 6. Out-Of-BandEnable/Disable Protocol

Step

COE In-Band

Bit-OrientedDatalink Pattern

Controller Card

Command Patterns

 

 

 

 

 

 

 

1

Send Arming Code

0001 1000 1111 1111

Loopback Arming Code for 400 ms followed by AIS.

 

 

 

 

2

Send Slot Enable or

Enable 0111 1000 1111 1111

Loopback the Enable/Disable code for 400 ms

Disable Code

Disable 0111 1010 1111 1111

followed by AIS.

 

 

 

 

 

 

Send Protection Line

0100 XXX0 1111 1111

Loopback line # code for 400 ms followed by AIS.

3

Switch

XXX = Line Number

 

 

 

(see Table 3)

 

 

 

 

 

4

Remove Pattern

 

Slot is now Enabled or Disabled for protection

 

 

switching.

 

 

 

 

 

 

 

Table 7. Out-Of-BandProtection Switch Protocol

 

COE In-Band

Bit-OrientedDatalink Pattern

Controller Card

Step

Command Patterns

 

 

 

 

 

 

1

Send Arming Code

0001 1000 1111 1111

Loopback Arming Code for 400 ms followed by AIS.

 

 

 

 

2

Send Protection Line

0100 XXX0 1111 1111

Loopback line # code:

 

Switch Code

XXX = Line Number

 

 

 

(see Table 3)

 

 

Slot Enabled

 

Perform switchover after 4 consective messages

 

 

 

received.

 

Slot Disabled

 

Loopback line # code followed by AIS. No switchover.

 

 

 

 

 

 

 

 

61190860L1-5B

Section 61190860L1-5,Issue 2

9

See Figure 5 andFigure 6 for switchover codes and traffic results.

8. SWITCHBACK

Switchback operation is defined as the re-establishmentof the T1 transmission path between the network and the customer using the regularly assigned line. Communication between the COE and RE will be based uponin-bandorout-of-band(ESF datalink) commands.

Switchback Receive Path

Remote

Switchback operation is accomplished by sending a specific sequence of SF in-bandpatterns or ESF datalink messages over the standby line.

NOTE

Communicationusingin-bandcodeswilloverridethe customer’s data during the switchback operation. The customer’s data will be overridden for 10 seconds. These remote provisioning commands are transmitted to the controller card from a remote test facility or a T1 test set at a DSX panel.

Local

Depressing S2 on the SCIM card for a minimum 5 seconds resets the protect configuration in memory.

CENTRAL OFFICE

CUSTOMER PREMISES

 

Office

 

DTWA

 

Repeater

 

DSX-1

Bay

NIU

CIM

 

 

 

Office Repeater

Main

CPE

 

 

< Live Traffic >

or

< Live Traffic >

DCS

HTU-C

T1 / HDSL / HDSL2

 

 

 

< Acknowledge

Office Repeater

Standby

 

or

 

 

Switch Code >

HTU-C

Switch Codes >

 

 

 

 

 

 

 

WECO D4

 

 

 

WESCOM 3192

 

 

TEST

 

 

 

PROTECT OPERATION

Figure 5. Protect Operation

CENTRAL OFFICE

CUSTOMER PREMISES

 

Office

 

DTWA

 

Repeater

 

DSX-1

Bay

NIU

CIM

DCS

 

Office Repeater

Main

CPE

 

 

 

or

 

 

HTU-C

T1 / HDSL / HDSL2

 

 

 

 

 

Office Repeater

Standby

< Live Traffic >

or

< Live Traffic >

 

 

HTU-C

 

 

 

WECO D4

 

 

 

WESCOM 3192

 

 

TEST

 

 

 

 

 

SWITCHOVER

 

Figure 6. Switchover

10

Section 61190860L1-5,Issue 2

61190860L1-5B