NMS Communication - CG 6500C Series

High-Density PSTN, VoIP, and Voice Processing Platform

The NMS Communications Convergence Generation™ CG 6500C Series is the ideal CompactPCI (cPCI) platform for cost-effective, scalable, highly reliable telephony solutions. By combining up to 16 T1/E1 PSTN trunks with high-density DSP voice processing power and built-in IP capability, the CG 6500C is the perfect choice for powerful applications ranging from media servers and enhanced service platforms to IP gateways. Voice-over-IP (VoIP) gateways are easily implemented using NMS' rich and flexible software development environments, Natural Access™ and Fusion™. Design of IP media servers is further enhanced by the NMS PacketMedia™ IP media server development tool.


  • Channelized T1/E1 interfaces for up to 480 DS0 streams
  • 8 or 16 digital PSTN trunks
  • PSTN digital trunks, software selectable between T1 and E1 (120 ohm)
  • A-law or µ-law PCM encoding
  • Dual 10/100Base-T interfaces either on rear panel or connected to PICMG 2.16 backplane
  • On-board RTP/RTCP processing by fast PowerPC
  • Voice processing DSP resource pool of up to 9,600 MIPS
  • Supports PacketMedia IP media server and Fusion VoIP gateway development environments
  • Low-latency media streaming
  • Single-slot 6U CompactPCI solution
  • Supports all popular signaling protocols
  • Echo cancellation (20 ms tails) on up to 480 ports tied to the line
  • Implements full H.110 specification with 4,096 timeslots to build open architecture, high-capacity systems
  • Uses MVIP-95 switching model
  • Supports full PICMG hot-swap standard
  • Feature-rich Natural Access software development kits support Windows®, Intel® and SPARC® Solaris™, and Linux®


  • IVR and/or conferencing engines with up to 480 ports per cPCI slot
  • VoIP gateways with up to 360 ports per cPCI slot
  • IP media servers
  • Enhanced services platforms
  • Wireless/IP gateways
  • VoIP and PSTN telephony testing systems
  • High-density voice processing (DSP) resource

Technicals Description:

The architecture of the CG 6500C Series integrates PSTN interfaces, telephony protocols, comprehensive IVR functionality, full-duplex echo cancellation, speech encoding, fax processing, Fast Ethernet interfaces, and packet protocols into a single-slot package. This integration results in a cost-effective and scalable platform for OEMs building next-generation convergence solutions requiring capacities of 120 ports or more.

The CG 6500C is a carrier-grade platform targeted at in-the-network deployments, where scalability and reliability are absolute requirements. NMS' leadership position in the CompactPCI industry is visible in the platform with first-to-market hot swap driver support, rear-panel I/O connections, and low power consumption.

Natural Access Support

The CG 6500C Series is supported by NMS' Natural Access development and runtime environment. Natural Access provides a consistent set of APIs that are operating system independent, thereby delivering true application portability. With Natural Access' Natural Call Control™ Service, programmers can easily and quickly develop applications that run on multiple types of telecommunications interfaces by using a single protocol-independent API. Natural Call Control minimizes the processing overhead on the host CPU by executing protocols on the board's control processor. Natural Access unifies application development across NMS Alliance Generation® and Convergence Generation products.

Fusion, Packetmedia, and Media Streaming Architecture

The CG 6500C Series is supported by both the NMS Fusion 4 standards-based VoIP solution and the NMS PacketMedia software for IP-based enhanced services applications. This development environment offers significant advantages in development time, performance, and most importantly, scalability. Fusion 4 provides a common software development environment that can be used to create IP telephony gateways, IP-enabled enhanced services platforms, and wireless IP telephony gateways.

PacketMedia is intended to support the broadest possible range of IP-based enhanced services applications with an optional capability to support a combination of IP and PSTN originating or terminating calls. PacketMedia supports services ranging from basic applications such as unified communications, prepaid calling, and conferencing to innovative new web-based applications such as voice portals, voice browsers, and wireless web access.

The powerful media streaming capability is presented as a standard Natural Access service that provides functions for creating media channels that transfer data between endpoints. Supported endpoints include T1/E1, RTP/IP, UDP/IP-T.38 fax, and host-based functions such as play/record. This media streaming service can be used in combination with other Natural Access services, such as Natural Call Control, to provide an interface for PSTN call control and IVR.

When using the media streaming service, the application creates a connection to describe the flow of data through the CG 6500C Series platform. Applications establish connections by creating media streaming endpoints and channels, and then connecting sets of endpoints with channels. The service provides programmers with a standard set of endpoint and channel types with which to build connections.

For more information regarding Natural Access, Fusion, or PacketMedia, please refer to their individual data sheets.

Dual Redundant Ethernet

The CG 6500C Series features dual 10/100 Base-T Ethernet interfaces. These can be used either as two independent subnets or in an automatic failover mode that switches traffic to the alternate interface without interruption of in-progress calls. This feature protects against wire cuts or hub failures. These interfaces may either be accessed from back panel connectors or may connect to the PICMG 2.16 Ethernet on the chassis backplane.


In addition to diagnostics run at boot-up time, the CG 6500C performs run-time diagnostics for the following events:

  • Rear transition board missing: If the CG 6500C senses that the rear transition board is not properly inserted, interrupting the trunk paths, it will send an alarm to the application.
  • Temperature measurements: The application can request current temperature from sensors placed on the board


T1/E1 Trunks
Typical Applications
CG 6500C/64
DSP resource card (no T1/E1 and no IP)
CG 6500C/96
DSP resource card (no T1/E1 and no IP)

CG 6500C-2L/8TE


240 PSTN ports of IVR

CG 6500C/64-2L/8TE
240 PSTN universal media ports or DSP resource card
CG 6500C/96-2L/8TE
240 ports of IVR, fax, and PSTN conferencing or DSP resource card
CG 6500C/64-2L/16TE
480 PSTN ports of IVR
CG 6500C/96-2L/16TE
360 ports of IVR + fax or 480 ports of IVR + conferencing
Fusion/CG 6500C-2L/8TE
120 port Fusion license
Fusion/CG 6500C/64-2L/8TE
240 ports of Fusion for gateway or IP media server
Fusion/CG 6500C/96-2L/8TE
Example: Mixed PSTN/IP conference engine with 240 PSTN + 240 IP members
Fusion/CG 6500C/96-2L/16TE
360 ports of Fusion for gateway or IP media server

The CG 6500C hardware supports the capability for software configuration as either E1 or T1 trunks.

PICMG 2.16 compliant versions are available for all variants shown in the table. To specify a PICMG 2.16 compliant version, replace "2L" with "0L" in the product name.

Technical Specification:


  • PowerPC Microprocessor (MPC 7410): The PowerPC Microprocessor is a high-performance 500 MHz RISC processor with 128 MB SDRAM and external cache.
  • PCI Bus: 33 MHz, 32-bit master or slave
  • PCI universal expansion board: Compatible with both 5.0 V and 3.3 V signaling environments
  • Input/output: Via CompactPCI rear-panel transition card

Host Interface

  • Electrical: PCI Local Bus specification Revision 2.1
  • Mechanical: PICMG 2.0, R2.1 CompactPCI
  • Bus speed: DC to 33 MHz
  • Bus type: 32-bit master or slave
  • I/O mapped memory: Memory-mapped interface for efficient block data transfers
  • Address/interrupts: Address and interrupts automatically configured by PCI BIOS (no jumpers or switches)

Software Environment

  • Development environment:
    • Natural Access 2002-1 or higher
    • Fusion 4
    • PacketMedia (Q4 02)
  • Hot Swap: Per PICMG 2.
  • Operating Systems:
    • Microsoft Windows 2000
    • Intel Solaris 8 (32-bit)
    • SPARC Solaris 8 (32-bit)
    • SPARC Solaris 8 (64-bit)
    • Future Operating Systems: Microsoft Windows XP and Red Hat® Linux V 6.2

H.110 Bus

  • Flexible connectivity between analog station ports and H.110 bus
  • 512 full-duplex connections to bus
  • 512 local connections
  • Switchable access to any of 4,096 timeslots
  • Individual data lines may be programmed in groups of 2, 4, or 8 Mbps for direct connection to boards with previous compatible technology
  • H.110 bus clock master or clock slave (software selectable)
  • H.110 bus termination (switch enabled)
  • Lucent Microelectronics Ambassador™ T8105 chips

Media Stream DSP Processing

  • Universal port capability:
    • Comprehensive IVR support
    • Echo cancellation
    • Vocoding: G.711, G.723.1, G.729a/b, G.726
    • Fax: T.38 real-time; T.37
    • store-and-forward
  • Processors: TI TMS320C5420 each with dual 100 MHz core plus 200 kB SRAM
  • Capacity: from 120 to 480 universal ports

IP Network Connectivity

  • Physical: Dual 10/100Base-T Ethernet interface via RJ-45 connectors on back panel or PICMG 2.16 on backplane
  • Protocols: RTP/RTCP, MGCP, H.323, DHCP, SNMP

PSTN Network Connectivity

  • Interface connectors: One or two RJ-48T connectors on rear transition board panel
  • Interfaces to short-haul trunks


  • Channel Associated Signaling (CAS): MFC-R2 (many country-specific variants), DID, R1.5, Winkstart MF/DTMF, loopstart T1, ground start T1, operator workstation T1, pulsed E&M, Feature Group D, SS5, off-premise station SA and FX, MF Socotel, Australian P2, three European country-specific variants of CAS
  • Common Channel Signaling: 11 variants of ISDN Primary Rate Interface (PRI)

DSX-1 Telephony Interface

  • Interface: Complete interface for up to 16 T1/E1 trunks (ANSI T1.102, T1.403)
    Framing: D4, ESF
    Insertion/generation and extraction/ detection: ABCD bits
  • Line code: AMI, B8ZS
  • Zero bit: Suppression selectable B8ZS, jammed bit (ZCS) or no zero code suppression
  • Alarm signal capabilities: Yellow, red, and blue
  • Counts: Bipolar violation, F(t) error, and CRC error
  • Robbed bit: Selectable on a per-trunk basis
  • Loopback: Per-channel and overall under software control; automatic remote loopback with CSU option
  • Connector: RJ-48C
  • Mix of ISDN and CAS trunks on a single board

CEPT E1 G.703 Telephony Interface

  • Interface: 8 or 16 G.703 trunks (120 ohm)
  • 75-ohm trunks: Must use an external 120 ohm to 75 ohm converter, such as NMS part number 33050
  • Framing: CEPT G.703/G.704 Channel Associated Signaling (CAS)
  • Insertion/generation and extraction/ detection: ABCD bits for CAS; HDLC/ LAPD for generating terminating data link
  • Line code: HDB3 or AMI (no zero code suppression)
  • Zero bit suppression: B8ZS, jammed bit (ZCS) or no zero code suppression
  • Alarm signals: Yellow, red, and blue
  • Counts: Bit error rates, CRC errors, slips, line code violations, far-end block errors
  • Loopback: DS0 and E1 level (software control)

Audio Signal Processing

  • Sampling rates: 8 ksamples/sec (telephone industry standard)
  • Speech compression (IVR):
    • 11 kHz, 8- or 16-bit linear (.WAV); 16-bit may reduce the number of ports per board
    • 8 kHz 16-bit linear (.WAV)
    • 64 kbps µ-law or A-law per ITU-T G.711
    • 16, 24, and 32 kbps ADPCM using NMS algorithm with NMS framing and bit packing with up to 2x speedup on play back
    • OKI-compatible ADPCM 24 kbps @ 6 kHz or 32 kbps @ 8 kHz with up to 2x speedup on playback
    • IMA-compatible ADPCM 32 kbps
    • G.726-compatible ADPCM 32 kbps

Tone Dialing

  • DTMF digits: 0 to 9, *, #, and ABCD per ITU Q.23 and Q.24
  • Rate: Programmable (10 digits/sec nominal)
  • Wait-for-dial tone capability
  • Dialing parameters: Software configurable (see Note*)
  • Dialing amplitude: Software configurable; range -33 dBm to +1 dBm (see Note*)

Pulse Dialing

  • 10 digits: 0 to 9
  • Pulsing rate: 10 pulse/sec (nominal)
  • Make/break ratio: Software configurable 40/60 nominal (see Note*)

*Note: NMS supplies configuration files that conform to national regulations for countries where certification has been received.

DTMF Tone Detection

  • DTMF digits: 0 to 9, *, #, ABCD
  • Dynamic range: -47 dBm to 0 dBm per tone, programmable
  • Tone duration: 40 ms (minimum)
  • Acceptable twist: 10 dB
  • Talk-off: Exceeds Bellcore TR-TSY-000763 tests

Analog Display Services Interface (ADSI)

  • Capable of sending and receiving Frequency Shift Key (FSK) data for ADSI
  • Transmit FSK function implements modem portion of Bellcore advisory TA-NWT 000030
  • 1,200 baud FSK support
  • Caller ID support
  • Easy to use API support in Natural Access

Switch Compatibility (partial list)

  • EuroISDN
  • Lucent 5ESS
  • Nortel DMS-100, DMS-250

Power Requirements

Test Description
3.3 V
5.0 V
Total Power
120-port gateway (3200 MIPS)
1.5 A
3.3 A
18 W
240-port gateway (6400 MIPS)
2.2 A
4.0 A
24 W
360-port gateway (9600 MIPS)
2.9 A
4.3 A
29 W


  • Operating temperature: 0 °C to +50 °C
  • Storage temperature: -20 °C to +70 °C
  • Humidity: 5% to 80%, non-condensing

CompactPCI Chassis Requirements

  • J3 connector isolation rating: J3 connector must have 500 Vdc breakdown rating to all other paths

Standards and Compliance

  • Digital multiplexer requirements and objectives: AT&T pub. 43802, July 82
  • Service description and interface specifications: AT&T TR 62411, ACCUNET T1.5
  • Carrier to customer installation DS1 metallic interface: ANSI T1E1/88-001R1, Feb. 88
  • ANSI T1 standard for ISDN Primary Rate Interface: T1E1.4/8868 (proposed text) April 88
  • Primary Rate User-Network Interface Layer 1 Specification: ITU-T I.431, June 88
  • ISDN Primary Rate Interface Specification: AT&T Pub. TR41449 and TR41459, June 85
  • PCI SIG: PCI Specification Revision 2.1
  • ECTF: H.110 Revision 1.0
  • CompactPCI: PICMG 2.0, Rev. 2.1
  • Hot Swap: PICMG 2.1, Rev. 1.0