Cisco GainMaker GaN High Gain Balanced Triple 1 GHz System Amplifier 5-85/102-1002 MHz Data Sheet

Consumer bandwidth demand continues to grow at a rapid rate every year. As a result, cable operators with DOCSIS^®-based equipment have begun introducing fiber deeper and deeper into the network. They want to reduce service group sizes and ultimately double or quadruple (or more!) bandwidth speeds. The Cisco^® GainMaker^® gallium nitride (GaN) High Gain Balanced Triple (HGBT) System Amplifier is an ideal product for deep fiber applications. Why? Because with higher output levels, up to 58 dBmV, and significantly improved linearity and performance, longer reach needs can be met. The GaN amplifier carries on Cisco’s legacy of simple, reliable and fast installation and setup. Furthermore, the Cisco GaN HGBT System Amplifier can scale to meet the needs of all HFC network architecture (one product for all amplifier applications).

The amplifier provides three high-level forward RF outputs - main and auxiliary. All Cisco GainMaker products share common plug-in accessories and perform to 1 GHz in the forward path. The system amplifiers in this portfolio provide multiple forward RF output ports while the line extenders provide a single forward RF output port.

Cisco GainMaker 1 GHz system amplifier modules have increased gain to allow drop in for 750-MHz spacing and are mechanically compatible with previous Cisco GainMaker System Amplifier II, II+, and III housing bases, often allowing upgrade to higher bandwidth with no respacing or resplicing. The DC power supply is modular and located in an updated housing lid for easy access. All Cisco GainMaker 1 GHz system amplifier modules are factory configured with reverse amplifier, diplex filters, thermal compensation circuit, forward interstage pads, and equalizer to promote optimal performance. Optional single-pilot automatic gain control (AGC) configurations are also available.

Features

●   High-performance GaN gain stage technology

●   Plug-in accessories that are common to all Cisco GainMaker nodes and Cisco GS7000 products (i.e., attenuator pads, equalizers, diplexers, and crowbar)

●   Amplifier cover that provides access to RF test points

●   Power supply mounted in housing lid for efficient thermal dissipation (60- and 90-VAC powering capability)

●   15A current capacity (steady state) and 25A surge survivability

●   Optional three-state reverse switch (on/off/-6 dB) that allows each reverse input to be isolated for noise and ingress troubleshooting (status monitoring required)

●   Quadrature amplitude modulation (QAM) and analog pilot AGC available (optional)

●   AGC with thermal backup, which eliminates disruptive RF output variation in the event of pilot loss

●   Reverse input pad and RF test point for each reverse input port to allow optimum reverse path design and alignment

●   Surge-resistant circuitry that helps ensure gain stage protection without fuses or other failure-causing devices

Specifications

Table 1.       General Station Performance

Table 2.       Forward Station Performance

Table 3.       Reverse Station Performance

Table 4.       Station Delay Characteristics

Table 5.       Station Powering Data

Data is based on stations configured for two-way operation. AC currents specified are based on measurements made with typical CATV type ferroresonant AC power supply (quasi-square wave), and Cisco GainMaker System Amplifier power supply (2.5A, 24 VDC, pn 734771).

DC supply has a user configurable 30V, 40V, or 50 VAC under-voltage lockout circuit. Default setting is 30V. 40V, or 50 VAC. Under-voltage lockout may be selected by changing the position of the lockout jumper.

 

 

 

Notes:

1.     Reference output tilt is specified as “LINEAR” tilt (as opposed to “cable” tilt).

2.     Forward gain and noise figure measured with 0 dB input EQ and 1 dB input pad.

3.     Down tilt, the effect of cable, is represented by a (-). Up tilt, the effect of equalization, is represented by a (+).

4.     73 CW NTSC channels loaded from 115 to 550 MHz. Digital refers to 550-1002 MHz loading with QAM carriers at -6 dB levels relative to analog video carrier levels.

5.     X-mod (@ 15.75 kHz) specified using 100 percent synchronous modulation and frequency selective measurement device.

6.     Reverse gain and noise figure for station with 0 dB reverse input pad, 0 dB reverse output EQ, and 1 dB output pad.

7.     Reverse operational gain, noise figure, and return loss are specified without reverse switch option. If switch is installed, reduce gain by 0.5 dB, increase noise figure by 0.5 dB, and decrease return loss by 1 dB.

8.     Composite intermodulation noise is a broadband noise-like distortion product associated with QAM loading.

9.     Distortion performance at reference output levels and tilt. Consult Cisco Systems Engineering for CIN calculation.

10.   The gain at 102 MHz is < 1.5 dB below the gain at 105 MHz. 102 to 105 MHz is recommended for out of band communication only. No video carriers should be used between 102 and 105 MHz.

Table 6.       Physical Specifications

 

 

 

 

 

 

 

 

 

 

Unless otherwise noted, specifications reflect typical performance and are referenced to 68°F (20°C). Specifications are based upon measurements made in accordance with SCTE/ANSI standards (where applicable), using standard frequency assignments.

Ordering Information

The Cisco GainMaker High Gain Balanced Triple is available in a wide variety of configurations. The desired configuration is “built” by accessing the Cisco Commerce Workspace tool at https://cisco-apps.cisco.com/cisco/psn/commerce. The user specifies the new Assemble To Order (ATO) Product ID for the Cisco GainMaker System Amplifier High Gain Balanced Triple “GMSA-HGBT” and the tool steps through the available options, from which to choose. Services may also be selected during this process. Once all the desired options are selected, the configuration and price are displayed. When the “Done” radio button is clicked, the configuration can be exported and saved for future use or immediate ordering.

This page contains ordering information for required and optional accessories. Please consult with your Account Representative, Customer Service Representative, or System Engineer to determine the best configuration for your particular application.

Table 7.       Required Accessories

The optional accessories listed in Table 8 may be ordered separately.

Table 8.       Optional Accessories

The housing options listed in Table 9 may be included with the product if ordered using the Cisco GainMaker Ordering Matrix. They may also be ordered separately.

Table 9.       Housing Options