Series 5 FAQ

Overview | Cross Reference | FAQ

DLC Technology
Pulsecom's DLC Solution

DLC Technology:

What is a digital loop carrier?
A digital loop carrier is an intelligent, digital transmission platform used to combine many voice and/or data channels over existing copper, fiber, or wireless transmission facilities. Digital loop technology enables the multiplexing of 24 subscribers on a single digital link.

What are the benefits of using digital loop carrier systems?
Using digital loop systems benefits telephone service providers by significantly lowering their installation and material costs, since fewer and smaller cables are required for providing expanded service. In addition, digital loop carrier solutions make it possible to serve growing business and residential areas more quickly than designing and building new telecommunications infrastructure.

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Pulsecom's DLC Solutions:

How are Pulsecom’s Digital Loop Carrier Solutions configured?
The Pulsecom Digital Loop Carrier Solution consists of an optional Central Office Terminal (COT) (ET for International applications) located in the central office and a Remote Terminal (RT) located at or near the subscriber premises, usually in an external cabinet. The two terminals communicate with each other through a digital transmission link. Many applications permit the RT to communicate directly with a digital switch to eliminate the need for a COT (or ET for International).

What products are included in Pulsecom’s Digital Loop Carrier Solution?
Pulsecom's T1-based Digital Loop Carrier Solutions represent an extensive array of components and systems designed to support local exchange needs as basic as Plain Old Telephone Service (POTS) and as complex as ISDN or special services. Our T1-based digital loop carrier solutions include the following product lines:

  • Series 5 systems and components
  • S-24DU components
  • SLC® 96 compatible products
  • SLC 2000 compatible components
  • SONET Systems and Components

What functions do Pulsecom’s Series 5 systems support?
The Series 5 system is a digital loop carrier system that serves up to 192 subscribers over digital transmission facilities. The system is intended as a vehicle for feeder plant relief, modernization, new wire center deferral, or digital network extension.

System components include racks, channel banks, cabinets, and plug-in modules for the central office terminal (COT) and the remote terminal (RT).

How are the Series 5 systems deployed?
The Series 5 systems can be deployed as follows:

  • As an RT-to-COT configuration interfacing via analog connections to an analog or digital switch (universal applications), or
  • As an RT only directly connecting into a TR-08 or TR-303 digital switch interface (integrated applications).

Series 5 systems support transmission of repeatered T1 or HDSL. As well, the Series 5 system can provide a DSX interface for use with an office repeater bay or higher speed facilities such as radio or fiber.

What components are included in Pulsecom’s Series 5 systems?
The Series 5 systems include components for the COT and the RT. For the COT, the following components are available:

  • Mounting bays
  • Universal dual channel bank
  • Common units
  • Channel units
  • Pulsecom craft interface unit
  • Test extender cards

For the RT, the following components are available:

  • Mounting bays
  • Universal dual channel bank
  • RT5-96 cabinet system for low-density applications
  • RT5-192 cabinet system with dual channel bank
  • RT5-384 cabinet system for intermediate size applications
  • Common units
  • Channel units
  • Pulsecom craft interface unit
  • MSNN
  • Test extender cards

What service capabilities does the Series 5 system support?
The Series 5 system supports a full-line of subscriber services, including:

  • Message telephone service (MTS)
  • Plain Old Telephone Service (POTS)
  • Universal Voice Grade (UVG)
  • Coin
  • Frequency Selective Ringing (FSR)
  • Multiparty (MPTY)
  • Direct Inward Dial (DID)
  • Enhanced SPOTS (E SPOTS [2-wire special service])
  • 4-wire special service
  • Digital Data Service (DDS)
  • Integrated Services Digital Network (ISDN)
  • P-Phone

Would a TR-303 interface work with Pulsecom's Series 5 product?
Yes. The Feature Package 303 (FP-303) Series 5 provides a seamless interface with #5ESS, DMS-100, or EWSD with TR-303.

Do the Series 5 systems support a TR-303 interface to a DMS-100 or EWSD?
Yes, the Series 5 systems will interface with a 5ESS, DMS-100, and EWSD.

How do I manage the alarm connections for 2 RT5-96s connected to one COT?
Pulsecom’s AUB3 Alarm Interface Unit (AIU) links the Series 5 dual channel bank in which it is located to the central office alarms a well as remote alarm reporting systems. A single AUB3 will relay the alarms from a dual channel bank to the central office and up to two additional locations such as a centralized maintenance bureau.

What is the difference between integrated and universal configurations?
Universal means that there is a Remote Terminal and a Central Office Terminal. The interface to the switch is individual analog DS0 signals. Integrated configurations allow for a digital interface at a DS1 rate to the switch. There are two digital interfaces available: TR-008 and TR-303 compliant interfaces.

What is the difference between TR-008 and TR-303?
TR-008 has basically two modes of operation: Mode 1 and Mode 2. Mode 1 supports all services with no concentration. Mode 2 offers 2 to 1 concentration by allowing the dial tone to the first 24 subscribers in a shelf (two digroups) to go off hook. If you are customer 25 to go off hook, you will not get dial tone. Mode 2 does not support ISDN.

TR-303 also offers concentration: 4 to 2 or 4 to 3. It does this through time slot interchanging. This means that 96 subscribers share the facilities. TR-303 may also be used in a non-concentrated mode . Another feature of TR-303 is D channel multiplexing for ISDN service.

What is Adaptive Hybrid Balance?
This is a fancy term for removing echo. This is done using digital signal processing to eliminate signal reflections caused by the inherent impedance mismatch of the hybrid and the subscriber drop. The result is improved signal quality.

Can I use my the same P-Phone units in SLC-2000 that I use in Series 5?
Series 5 P-Phone units identify themselves as POTS-like units to the system. (This is typical of non provisioned units such as POTS, SPOTS, Coin). In SLC-2000, any POTS-like unit is only provided with 56Kbps instead of the full 64Kbps usually associated with a DS0 channel. This is no problem for true POTS units, but P-Phone requires all 64Kbps. Therefore, special P-Phone units were developed for SLC-2000 applications which provide a DDS-like identification. When used in the SLC-2000, there is no provisioning of these units required.

Although the Series 5 EBS30 and EBS50 cannot be used in the SLC-2000, the SLC-2000 units (EBS330 and EBS550) may be used in the Series 5. The drawback is that the physical slots must then be provisioned using a PCIU or Lucent CIU as dataport cards.

Is the ISDN-U for Series 5 compliant with TR-397?
Yes, the ISDN-U is compliant with TR-397, but it has also been designed to adapt to the proprietary interface used by Lucent Technologies in their AUA92 and AUA93. The Pulsecom ISDN-U is the only unit which offers compatibility with both the Lucent interface and TR-397 compliant ISDN units such as those manufactured by Teltrend and Adtran.

When do I need a NULL card?
When Series 5 was developed, ISDN was not a defined service. Therefore, early versions of the Bank Control Unit used in the Series 5 do not recognize an ISDN identification from the channel card and don’t realize that the unit requires a third time slot for the D channel. The NULL unit activates that third time slot for use by the ISDN unit. When newer Bank Control Units are used (MC97776A1B or later), no NULL unit is required, because the system automatically allocates the third time slot.

If I have an integrated system, what can I use in the central office to interface with the HDSL Line Interface Units in the RT?
The HDSL-62 (pdf) and HDSL-64 (pdf) units are compatible with HLUs from PairGain Technologies. They are also compatible with Doublers from PairGain. Typically, in integrated configurations, an HLU-231 L2D is used in the office repeater bay which will interface with either the HDSL-62 or HDSL-64 in the RT.

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