The Golong system was developed to work with ADSL technology.  Symmetricom utilizes the mid-span repeater methodology which requires a Central Office (CO) power unit (Standard 3192 mechanics) and a field repeater unit (439 mechanics). Placement of these units will depend upon the loop makeup and length. The diagram below details how this would be configured:

Figure A1-Scenario with GoLongä Technology:

  The GoLong system is an active amplifier that supports Discrete Multi-Tone(DMT) Line code. We recommend that it be placed into local loops with 24 or 26 AWG, twisted pair cable. GoLong technology performs ideally on these wire gauges. Using the above as a guide, GoLong will provide data rates of 1.5 Mbps downstream and 256 Kbps upstream at distances of 21 Kilofeet (Single amplifier) and 30 Kilofeet (Two amplifiers). GoLong will work on 19/22 AWG cable. The data rates would be comparable to the above but the distances would be longer. Note that POTs can be carried on a separate pair out to the CPE or the POTs can be bridged on to the single pair going to the CPE. POTs and ADSL can then be filtered out using a micro-filter at the home.

  Another scenario, which will extend local loops from the RT, may look like the diagram below:

      Figure – A2 Using Various Remote Terminal Strategies:

  Note that the POTs line can be bridged after the  repeater is placed in the circuit. A splitter/combiner can also be used for this function if more than 12 ADSL lines are being supported at a given location.

  One of the two main units used to support ADSL implementation are the ALE-C unit that is placed in the ORB location. This unit meets the 3192 card mechanics and is compliant with GR-63-CORE NEBS.  The other unit is an ALE-Remote. This unit is compatible with 439 card mechanics and is placed into the Outside Plant (OSP) line via a repeater case.

   The ALE-C card supports two ADSL lines. Each line can support up to two repeaters. The ALE-C unit performs continuous health checks to insure that the ALE-R is functioning. Also, it will determine if a problem is encountered with an open or shorted line. Alarm outputs are available so remote alarm management can be utilized.

  The ALE-R unit is spliced into the local loop at approximately 8kft/12kft (For 1st repeater) and 15kft/22kft (For 2nd repeater). This is based on either 26/24 AWG from the C.O. to the customer premise.

 GoLong deployment will allow the incumbent phone  company to utilize existing equipment shelves(3192 form factor); utilize vacated T1 repeater housings; utilize DLC COT’s and DLC RT’s. This will allow a Company to leverage the embedded equipment to provide ADSL service.

    ADSL service, for example, can be deployed by the simple addition of an ADSL/POTs combiner placed in the Remote Terminal(RT). In addition, you need to add an ALE-C card to an existing 3192 shelf plus an ALE-R housing and card on a separate copper pair. This is conceptualized in Figure A3 below.

  The ADSL line can also be bridged right on to the POTs line without a combiner at the RT site. An ADSL filter is required at the CPE to separate the DATA from the VOICE at each individual RJ-11 room jack should this scenario be used. This method has been used at two of our trial sites and works quite well. Thus far, there have been no problems with this type of set-up.

GoLong Specifications:

DEPLOYMENT GUIDELINES

Line code Supports DMT

Cable type 24–26 AWG, Twisted Pair (load coils removed - standard requirement for ADSL)

Data rate Adaptive ADSL with minimum 1.5 Mbps downstream and 256 kbps upstream at distances of 21 Kilofeet (single repeater) and 30 Kilofeet (two repeaters)

SPECTRAL COMPATIBILITY

IDSL (Repeated and Non-repeated) Compatible

Non-repeated ADSL Compatible

EMC

FCC TITLE 47, Part 15, Subpart B for class A digital devices

NEBS GR-1089 CORE, Section 2 ESD, Section 3 Electromagnetic Interference and Electromagnetic Immunity (10kHz to 10GHz)

ADSL LOOP EXTENDER - CENTRAL OFFICE CARD (ALE-C)

3192 card mechanics compliant with GR-63-CORE NEBS

Two circuits per slot providing span line power, health check and management for two repeated lines.

Input power -38 to -60 VDC

Span Line power -135VDC Maximum

Span line current 30mA Nominal

Power Dissipation 6 W maximum per ALE-C channel

Operating temperature -40°C to 65°C

Relative Humidity 0% to 85% (5°C to 40°C non-condensing)

ADSL LOOP EXTENDER - REMOTE LOCATION CARD (ALE-R)

439 card mechanics compatible with standard repeater housings.

One circuit per slot

Power via span line and ALE-C card

Power Dissipation 1 W maximum per ALE-R

Impedance 100 ohms

Operating temperature range -40°C to 85°C

Relative Humidity 0% to 90% (0°C to 50°C non-condensing)

MAINTENANCE & ALARMS (ALE-C)

Continuous health check monitors operational status of each line and repeaters.

Alarm relay output upon repeater failure.

MTBF:  > 4 years (Calculated, Telcordia SR-332 Issue 1)