PairGain HLU-231 Quick Installation Manual

QUICK INSTALLATION GUIDE PAIRGAIN TECHNOLOGIES, INC. SECTION 350-231-164-01 Revision History of this guide. Revision 01—November 25, 1997 A) Initial Release Model List Part Number CLEI Code HLU-231 6D 150-1111-64 T1LIE144AA

Table of Contents Introduction ........................................................................... 1 Features ............................................................................ 2 Compatibility ................................................................... 3 Installation ............................................................................. 4 HLU-231 Card-Edge Connectors .................................... 4 Installing the HLU-231 .................................................... 5 Provisioning ........................................................................... 6 Using the SEL and MODE Front Panel Buttons ............. 6 Default Settings ................................................................ 6 Using the Craft port ......................................................... 7 System Settings ................................................................ 8 Testing .................................................................................. 11 Alarms ............................................................................ 11 Loopbacks ...................................................................... 12 Four-Character Diagnostic Messages ............................ 14 Specifications ....................................................................... 16 Documentation .................................................................... 16 Technical Support ............................................................... 16 Bulletin Board Services ................................................. 17 Copyright © 1997 PairGain Technologies, Inc. PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.

1 Introduction The PairGain® HiGain® Line Unit Model HLU-231 List 6D (Part Number 150-1111-64) is the Central Office (CO) side of a repeaterless T1 transmis- sion system. It is used in conjunction with the HiGain HRU Remote Unit to provide a complete HiGain High-bit-rate Digital Subscriber Line (HDSL) system. This guide addresses HLU-231 List 6D operation when used with and without doublers. For applications without doublers, the HLU-231 List 6D is directly connected to the HRU by the two cable pairs. For doubler applications, one or two doublers may be used in the HDSL loops between the HLU-231 List 6D and the HRU. For more detailed information consult the HLU-231 List 6D Technical Prac- tice (Section Number 150-231-164).

Features The HLU-231 Line Unit List 6D front panel features are:

3 The HLU-231 List 6D front panel components are: Compatibility The HLU-231 List 6D is designed to mount in the following shelves with 220 mechanics: • PairGain HCS-418 19-inch shelf • PairGain HCS-417 23-inch shelf • 220-configuration Office Repeater Bay (ORB) shelf or equivalent Small Cross Section Shelf (SXSS) • Kentrox T-Term shelf • PairGain HCS-402 shelf Name Function Front panel display Four character LCD that provides status messages for HDSL, S/N margin, optional settings and alarms. System option buttons MODE and SEL (Select) buttons used to set system modes. Status LED Tri-color LED that indicates system state: Green Normal Operation Flashing Green HDSL Acquisition Flashing Red Minor Alarm Red FUSE ALRM Yellow Self Test in progress or an HLU-231 List 6D loopback in effect (CREM) or (NLOC) Flashing Yellow The HLU-231intelligent loop- back is in an ARMED state Receive (RCV) and Transmit (XMT) Splitting access and bridging "210-Bantam"-type jacks. Craft port RS-232 connector that provides access to the mainte- nance, provisioning, and performance monitoring inter- face through a dumb terminal. Retaining latch Secures the HLU-231 to the shelf in which it is installed.

Installation Upon receipt of the equipment, visually inspect it for signs of damage. If the equipment has been damaged in transit, immediately report the extent of damage to the transportation company and to PairGain Technologies (see Technical Support on page 16). HLU-231 Card-Edge Connectors The HLU-231 card-edge connector pinouts are shown below. The following rules apply to the HLU-231 card-edge connector: • If the shelf uses pin 23 remove resistor R39 from the HLU-231 board. This removes the burn-in circuit from pin 23. • The HLU-231 uses pins 20 and 21 as alarm-relay output. The Kentrox 220 T-Term shelf uses the same pins for external equalizer output. If the HLU-231 is installed into a Kentrox shelf, the HLU-231 ALM option must be disabled (see Provisioning on page 6 for further information).

5 Installing the HLU-231 To install the HLU-231 into a PairGain shelf, slide the unit into the shelf card guides for the desired slot, then push the unit in until it is entirely within the card guide and the retaining latch locks into place, indicating that the unit is properly seated:

Provisioning The HLU-231 List 6D contains a non-volatile RAM (NVRAM) that stores the system option settings. The options are set through the SEL (Select) and MODE buttons on the front panel, or through a terminal connected to the Craft port. System option settings are retained if shelf power is lost or if the HLU-231 List 6D is unplugged. Using the SEL and MODE Front Panel Buttons To provision the HLU-231 List 6D through the SEL and MODE front-panel buttons: 1 Press the MODE button for approximately one second. The message displayed on the front panel alternates between the first system parameter and its current setting. 2 Press the SEL button to step the display through all possible settings (one at a time) of the parameter being displayed. 3 Press the MODE button to select the desired parameter and move to the next parameter. After you have configured the last parameter, the dis- play prompts you to confirm the settings. 4 Do one of the following: • Press the SEL button to install the settings. • Press the MODE button to bypass the settings. If neither button is pressed in 30 seconds, the settings are bypassed. Default Settings To return the system options back to the original factory default settings: 1 Press the SEL button until the DFLT NO message appears. 2 Press the SEL button again and DFLT YES displays indicating the fac- tory default values are now in effect. To terminate the DFLT mode without setting the factory default values, press the MODE button or do nothing for 30 seconds.

7 Using the Craft port The Craft port, a 9-pin RS-232 connector, on the HLU-231 front panel allows you to use a standard RS-232 cable to connect your system to a dumb terminal or PC running a terminal emulation program. Once connected you can access the maintenance, provisioning, and performance screens. To provision the HLU-231 through the Craft port: 1 Configure the dumb terminal to the following communication settings: • 1200 to 9600 baud (9600 baud is recommended) • Parity: NONE • 8 data bits • 1 stop bit • Hardware Flow Control set to NONE • VT Terminal Emulation 2 Use a serial cable to connect the RS-232 COM port on the dumb terminal to the HLU-231 front panel Craft port. 3 On each screen, enter the key represented by the letter in parenthesis for the parameter to be changed. • Each entry of this letter scrolls the parameter to its next value. • After all selections have been made, press to exit and to con- firm the changes. This activates the new choices and returns control to the Main Menu screen. The following four user options must be set via the dumb terminal interface: Circuit ID, Time and Date, DS0 Blocking, and Margin Alarm Threshold. If using the Microsoft Windows terminal emulation program, from the Settings, Terminal Preference menu, deselect Show Scroll Bars and Use Function, Arrow, and Ctrl Keys for Windows. E C

System Settings The asterisks (*) in the following system settings descriptions indicate the factory default settings. HLU-231 List 6D System Options Mode Selection Description EQL EXT* Selects extended equalizer. 0 Sets the internal equalizer to DSX-1 for 0 - 133 feet. 133 Sets the internal equalizer to DSX-1 for 133 - 266 feet. 266 Sets the internal equalizer to DSX-1 for 266 - 399 feet. 399 Sets the internal equalizer to DSX-1 for 399 - 533 feet. 533 Sets the internal equalizer to DSX-1 for 533 - 655 feet. ZBTS ON Selects the Extended Superframe (ESF) frame ZBTSI mode. OFF* Deslects the ESF frame ZBTSI mode. LPBK DIS Configures the HLU-231 to ignore the 2 in 5 Smart-Jack loopback command. ENA* Enables the HLU-231 to respond to the 2 in 5 Smart-Jack loopback command. LBTO NONE Disables automatic time-out cancellation of all loopbacks. 20 Sets automatic cancellation of all loopbacks to 20 minutes after initiation. 60* Sets automatic cancellation of all loopbacks to 60 minutes after initiation. 120 Sets automatic cancellation of all loopbacks to 120 minutes after initiation. ALM DIS* Opens the relay alarm contacts, if closed, and prevents another relay alarm closure from occurring. ENA Enables activation of the minor alarm relay when a minor alarm condition occurs.

9 ESAL 17 Closes the Alarm relay contacts and flashes the red Status LED when 17 ES (17 HDSL CRC errors on either HDSL loop or a total of 17 BPVs) occur within a 24-hour period. 170 Closes the Alarm relay contacts and flashes the red Status LED when 170 ES (170 HDSL CRC errors on either HDSL loop or a total of 170 BPVs) occur within a 24-hour period. NONE* Prevents generation of an alarm due to excessive Errored Seconds. SPLB GNLB* Configures the HiGain system to respond to the generic in-band loopback codes. A1LB and A2LB Configures the HiGain system to respond to the Teltrend addressable repeater in-band loopback codes. A3LB Configures the HiGain system to respond to the Wescom addressable repeater in-band loopback codes. A4LB Configures the HiGain system to respond to the Wescom Mod 1 addressable repeater in-band loopback codes. A5LB Configures the HiGain system to respond to the Teltrend Mod 1 addressable repeater in-band loopback codes. PWRF DIS Disables powering to the HRU and/or doubler over the HDSL pairs. ENA* Enables powering to the HRU and/or doubler over the HDSL pairs. DS1 B8ZS Places both the HLU and HRU into their B8ZS modes. AMI* Places both the HLU and HRU into their AMI modes. AUTO If the HLU detects the B8ZS pattern in the incoming T1 bit streams, it enters B8ZS. If not, it enters AMI mode. MARG 0 to 15 dB The Margin Alarm Threshold determines the minimum allowable margin below which an alarm will occur. 4* Default value. HLU-231 List 6D System Options (Continued) Mode Selection Description

DS0 BLK The DS0 blocking option can only be set through the Craft port with a terminal. The 4-character HLU-231 List 6D front panel LED readout only displays the status of the blocking option. BLK indicates at least one channel is blocked. NONE* NONE indicates no channels are blocked. FRMG AUTO* Configures HiGain to operate in an auto-framing (AUTO) mode in which it continuously searches the input T1 bit stream for a valid Superframe or Extended Superframe pattern. This feature is required for fractional T1 applica- tions (DS0 blocking) where it insures proper channel time slot alignment. While HiGain can also process unframed data in this AUTO mode, it is recommended that the UNFR mode be used for all unframed applications. Using the AUTO mode for unframed applications runs the risk of detecting "pseudo valid" frame sequences, which can affect the data integrity. UNFR Configures HiGain to operate in an unframed mode. This mode disables the auto framing process and forces HiGain to function as a transparent bit pipe. HAIS 2LP* Causes HiGain to transmit the Alarm Indication Signal (AIS) signal at both the HLU and HRU T1 output ports when both of the HDSL loops are not in sync (Loss of Sync-Word). 1LP Causes HiGain to transmit the AIS signal at both the HLU and HRU T1 output ports when either of the two HDSL loops is not in sync (LOSW) or if a margin alarm occurs. SAIS ENA* Causes the HRU to transmit the AIS signal towards the Customer Interface (CI) when in NREM loopback. DIS Prevents the AIS signal from being transmitted to the net- work interface and replaces it with the network test signal or by a quiet termination (Loss of Signal) depending on the list number of the HRU. CONF YES Confirms that all operating modes (listed above) are to be updated to their current selections. NO* Prevents the most recently selected operating mode selections from being updated. They remain as they were before the system option settings mode was entered. HLU-231 List 6D System Options (Continued) Mode Selection Description

11 Testing Minor alarm and diagnostic messages routinely appear on the HLU-231 front-panel four-character display. This display automatically turns on when power is initially applied to the HLU-231. To conserve power, the display remains on for only five minutes if neither the MODE or SEL buttons are pressed. The use of either button activates the four-character display and restarts the 5-minute power-control timer. Alarms Only one alarm can be displayed at a time, so the highest priority alarm is dis- played if more than one alarm exists. The following table lists the alarms ordered by priority: Status Menu Alarm Messages Message Full Name Description NONE No Alarms LLOS Local Loss of Signal No signal from HLU-231 local T1 inter- face. RLOS Remote Loss of Signal No signal from HRU remote T1 interface. LOSW1 or LOSW2 Loss of Sync Word 1 or 2 HDSL loop 1 or 2 has lost sync. H1ES or H2ES HDSL Loop 1 or 2 Errored Second Loop 1 or 2 has incurred a CRC error. DS1 Digital Service 1 DS1 input BPVs at the HRU have exceeded the user selected ES thresh- old. RAIS Remote Alarm Indicating Signal Indicates an AIS (all “1”) pattern is being transmitted from the remote or T1 output port. MAL1 or MAL2 Margin Alarm 1 or 2 The margin on HDSL loop 1 or 2 has dropped below the threshold (1 to 15 dB) set by the user. CHREV Channels Reserved The Loop 1 & 2 HDSL pairs are reversed at the HRU input port. Loop 1 is specified to carry the (-) simplex DC voltage, and Loop 2 is specified to carry the (+) simplex DC voltage.

Loopbacks The HLU-231 loopback messages are listed in the following two tables. A block diagram showing the GNLB locations and their activation codes are shown on page 13. Status Menu Loopback Messages Message Full Name Description SMJK Smart-Jack Loopback Loopback at HRU toward the HLU initiated by either the (2 in 5) in-band loopback code or the out-of-band ESF data link code. NREM Network Remote Loopback Loopback at HRU toward the HLU initiated by upstream in-band codes or from the dumb terminal. NLOC Network Local Loopback Loopback at HLU toward the network initi- ated by upstream in-band codes or from the dumb terminal. CLOC Customer Local Loopback Loopback at HRU toward customer initiated from Customer Premises Equipment (CPE) by in-band codes or from the dumb terminal. CREM Customer Remote Loopback Loopback at HLU toward customer initiated from CPE by in-band codes or from the dumb terminal. ARM Armed The HiGain system detected the Intelligent Repeater loopback (2 in 5) arming code. TLOS Transmit Loss of Signal (Loopback) HRU is in a logic loopback state caused by a loss of its T1 input from the customer, if enabled at the HRU through its TLOS switch option.

13 Status Menu Loopback Messages: (Doublers Only) Message Full Name Description NDU1 Network Doubler 1 Loopback The loopback at doubler 1 toward the net- work initiated by in-band codes, or the main- tenance terminal. NDU2 Network Doubler 2 Loopback The loopback at doubler 2 toward the net- work initiated by in-band codes or the main- tenance terminal. CDU1 Customer Doubler 1 Loopback The loopback at doubler 1 toward CI initi- ated by in-band codes or the maintenance terminal. CDU2 Customer Doubler 2 Loopback The loopback at doubler 2 toward CI initi- ated by in-band codes or the maintenance terminal.

Four-Character Diagnostic Messages The HLU-231 diagnostic messages are listed in the table below. Diagnostic Messages Message Full Name Description FERR Framing Bit Error Occurred Framing bit error occurred at HLU T1 input. LBPV Local Bipolar Violation A bipolar violation has been received at the T1 input to the HLU. SIG1 or SIG2 Signal 1 or Signal 2 The HLU and HRU transceivers are trying to establish contact with each other. S2L1 or 2† Signal 2 Loop or Loop 2 The 1st Doubler and either the HRU or 2nd Doubler transceivers are trying to establish contact with each other on loops 1 or 2 of span 2. S3L1 or 2† Signal 3 Loop or Loop 3 The 2nd Doubler and HRU transceivers are trying to establish contact with each other on loops 1 or 2 of span 3. ACQ1 or ACQ2 Acquisition 1 or Acquisition 2 The HLU and HRU multiplexers are trying to establish synchronization over each loop. A2L1 or 2† Acquisition 2 Loop 1 or Loop 2 The 1st Doubler and either HRU or 2nd Doubler multiplexers are trying to estab- lish synchronization with each other on loops 1 or 2 of span 2. A3L1 or 2† Acquisition 3 Loop 1or Loop 2 The 2nd Doubler and either HRU multi- plexers are trying to establish synchroni- zation with each other on loops 1 or 2 of span 3. ACO Alarm CutOff A minor alarm has occurred, and been retired to an ACO condition, through the use of the HLU front panel SEL button. Self Test The HLU is in a self test mode. This occurs every power ON/OFF cycle. † These messages only apply to systems with doublers present.

15 ALRM Alarm Condition Exists A minor alarm condition is in effect. 1=xx or 2=yy HDSL Loop Margins Indicates the relative S/N at each HDSL transceiving input port. Any value of ‘06’ or greater is adequate for reliable system operation. PWR FEED SHRT Power Feed Short Indicates a short between the 2 HDSL pairs in span 1. This same message can occur with an HRU is drawing the correct amount of power over good cable pairs but cannot communicate with the HLU. PWR FEED OPEN Power Feed Open Indicates an open circuit in both the tip and ring of either HDSL pair in span 1. BAD RT? No response from HRU The HLU does not receive any response from the HRU. Thus, the HRU’s integrity is questionable. VER HLU Software Version # This is displayed during the System Settings review mode. (Depress the MODE button for 3 seconds to enter Sys- tem Settings review mode.) LIST 0xL HLU’s List # Displayed during System Settings review mode defined above. FRM Frame: SF, ESF, UNFR, NONE Defines the type of frame pattern being received from the DSX-1. Displayed during System Settings. CODE Line Code: AMI, B8ZS This is the line code that the HLU is set to receive and transmit at its T1 interfaces. Displayed during System Settings mode defined above. Diagnostic Messages (Continued) Message Full Name Description † These messages only apply to systems with doublers present.

Specifications Maximum Power Consumption 18 Watts (without Doubler); 35 Watts (with Doubler) Maximum Heat Dissipation 8 Watts (without Doubler); 12.5 Watts (with Doubler) Mounting AT&T 220-configuration or equivalent. Dimensions Height: 5.9” (15 cm) Width: 1.4” (3.5 cm) Depth: 10” (25.4 cm) Documentation The HLU-231, List 6D has a complete technical practice that you can down- load from the PairGain Technical Manuals Web page at: www.pairgain.com. A password is required. If you do not have a password, contact your PairGain sales representative. If you have any comments on any PairGain documentation, send mail to [email protected]. Type the product name and the sec- tion number of the document in the subject area of the email message. Technical Support PairGain Technical Assistance is available 24-hours-a-day, 7-days-a-week by contacting PairGain Customer Service Engineering group at: Telephone: (800) 638-0031 or (714) 832-9922 Fax: (714) 832-9924 During normal business hours (8:00 AM to 5:00 PM, Pacific Time, Monday - Friday, excluding holidays), technical assistance calls are normally answered directly by a Customer Service Engineer. At other times, a request for technical assistance is handled by an on-duty Customer Service Engineer through a callback process. This process normally results in a callback within 30 minutes of initiating the request.

17 Bulletin Board Services PairGain maintains a computer bulletin board system for obtaining current information on PairGain products, product troubleshooting tips and aids, accessing helpful utilities, and for posting requests or questions. This system is available 24-hours-a-day by calling (714) 730-3299. Transmission speeds up to 28.8 kbps are supported with a character format of 8-N-1.