The PacketBand-ISDN-B-4/8 delivers transparent switched ISDN data services across packet networks. All ports are locked with central, or network clocks, providing a fully synchronous environment across asynchronous networks.

PacketBand-ISDN-B-4/8 diagram


  • Product versions supports up to 4 or 8 ISDN BRIs
  • US-ANSI and Euro-ETSI ISDN available
  • Transmits all data and voice protocols over packet networks
  • Totally transparent to all data formats
  • All PacketBands and interfaces synchronised to the same clocks
  • Internal AC and DC power options
  • SIP Server option for centralised call routing
  • Various clocking options with high quality clock recovery
  • Any “B” channel can dial any other on the packet network, or “break-out/in” via a “gateway” PacketBand to national/international ISDN
  • Provides low-cost migration to IP networks for legacy equipment
  • Low data overheads
  • Configurable packet size
  • Compensates for “jitter” or packet delay variation
  • Re-orders packets
  • Very low latency or processing delay
  • Four 10/100 Base Ethernet ports; one to WAN (Packet Network) and three local Ethernets
  • Local Ethernets support Rate Limiting
  • Quality of Service (QoS) options
  • VLAN and Double VLAN tagging
  • Full cross-connectivity
  • Versions support TE and/or NT (connects to a network and local equipment)
  • ETSI to ANSI conversion
  • a-Law to μ-Law conversion
  • Support for contention or over-booking
  • Call Progress Tone generation
  • Number manipulation/conversion/LCR
  • Automatic Primary/Secondary/Tertiary routes
  • Routing profiles can be scheduled at different times of the day/week
  • ISDN Layer 2 and Layer 3 message capture and log for analysis
  • Easy and intuitive to configure via GUI management package
  • Compact table-top with optional rack-mount extenders
  • Approved (Telecoms, Emissions, Safety)
  • RoHS compliant

Connectivity Overview:
The PacketBand-ISDN range provides an important and unique method for transporting ISDN traffic across packet networks. For some types of device it is the only reliable and error-free solution. ISDN networks from carriers deliver clocked transparent 64k channels which can transport any type of traffic anywhere in the world; PacketBand does the same. ISDN "B" channels are set up dynamically across the packet network giving inter-connectivity between any device, and importantly can "break-out" into the global ISDN PSTN and access any other device world-wide. All PacketBands are locked and synchronised to the network clock via an advanced clock-recovery system ensuring reliable slip-free services for all applications. This means not only can high-quality voice be transported over low-cost packet networks using existing PBXs, but so can synchronous applications such as video-conference units, voice codecs, encryptors, fax machines etc. Not only does PacketBand deliver high-quality clock-locked transparent channels as and when needed and where needed, it also has great flexibility in terms of adding CLIs for billing, converting numbers for emergency routing and alternate routing and resilience options. A SIP Server solution is also available. If you are a carrier looking to deliver reliable ISDN to customers, a military, governmental or broadcast organisation needing to transport synchronous ISDN, or perhaps in another vertical or a corporate with some specific ISDN/IP issues, PacketBand may be able to assist.

Routing and Features:
Type of User Traffic
– Any. PacketBand passes all “B” traffic transparently in a clock-locked or synchronous environment. All PacketBands in the network are synchronised to a common clock.

Connectivity – Any “B” channel on any ISDN port can connect to any other. Full inter-connectivity with any other PacketBand-ISDN equipment, PRI or BRI.

“Break-Out” – PacketBand can be connected to the real ISDN network as a “gateway”, giving devices connected via the Packet Network access to/from all other ISDN devices in the world.

Logical Links – Each PacketBand-ISDN can be purchased supporting different numbers of Logical Links, Each Logical Link is a connection between any two PacketBands. For example, if there was one “B” channel established between two PacketBands that would be one Logical Link. If a second call is established, from either direction between the same two units, this “B” channel will be incorporated into the same Link to reduce overheads. Logical Links are only assigned when in use so once a connection has been cleared, the Link is available for use to any other PacketBand.

In-Coming Call Routing –ISDN traffic can be routed based on DDI (MSN), CLI, Sub-address, type of call (voice, fax, video etc), the port or channel number of an ISDN call or a combination of these fields. Calls can be routed to a specific ISDN port, group of ISDN ports, an individual “B” channel, timeslot or into the Packet Network.

Out-Going Call Routing – ISDN calls are routed to a remote PacketBand over the IP network either by user-configured rules or by using our SIP Server. Calls can be converted to the correct PacketBand (identified by IP address) based on internal tables which use all or part of the number dialled. If the number is not recognised the call can be routed to a “Gateway” PacketBand with access to the national/international ISDN.

Call Conversion – This feature enables PacketBand to add, edit or remove the digits in any part of a call before it is forwarded on. An example application might be where emergency numbers may need to be routed to a specific regional office and PacketBand can convert, for example, "112" into the correct regional telephone number for that location. Another example would be where the dialled number needs to be forwarded to a "hidden" destination number.

Call Barring – Block calls from certain CLI and/or calls with a certain DDI.

Alternate Routes – PacketBand supports Primary, Secondary and Tertiary routes. Should the primary destination be unavailable, the call will be routed to the Secondary etc.

BRI Port Options – Order NT, TE ports or a combination. User selectable ETSI/ANSI on a per-port basis with conversion. Tone generation, SPIDs and the ability inhibit particular information elements on a per-port basis is also standard. There are advanced options to allow connection to a wide range of ISDN devices supporting specific operating protocols and features.

Sip Server – An optional supplied SIP Server can help with network configuration and routing parameter maintenance in larger systems where attached devices may need to call any or many other locations as opposed to routing to a few central  sites. The SIP Server gives a central repository for all ISDN and IP routing tables, simplifying the requirements in individual PacketBands. Multiple SIP Servers can be configured for systems requiring exceptional resilience.

Packet Network Features:
Selectable Protocol: Choose from Pseudo-wire over IP or Pseudo-wire over IP including UDP/RTP.
Frames Per Packet: User-selectable size of packets to optimise performance.
VLAN: Configure a VLAN by adding tags to packets on a per Logical Link basis.
QOS: Configure QOS settings for each PacketBand unit, TOS and Diff Serv.
Packet Prioritisation: Set priorities for the handling of packets based on port, Diff Serv codepoint value or 802.1p value.
Rate Limiting: Limit packet rates from/to any Ethernet port by port or priority.
NAT Traversal: Set a Public IP Address to allow NAT traversal.
Sniffer Port: Configure a spare Ethernet port to receive RX and/or TX packets mirrored from any/all other PKT Port(s). This allows for connection of another device to monitor Packet traffic.
Auto Negotiation: Configure PacketBand to Auto-Negotiate Speed and Duplex settings, or force the unit to use Full/Half Duplex and 10/100M.
Oscillator Modules: Select between two different Stratum 3 oscillators to match clocking accuracy requirements across the packet network.


BRI Interfaces

  • Support for 4 or 8 BRIs
  • Order NT/TE in pairs of ports. Uses straight cables
  • Typical driving distance – 500m
  • Support for a-Law to μ-Law conversion and a-Law and μ-Law tones (ring/busy etc)
  • Overlap to En-Bloc conversion
  • Support for Dual TEIs


  • RJ45 120Ohm balanced
  • Point-to-Point and Point-to-Multipoint
  • ETSI-DSS1 (Euro-ISDN)
  • ETSI Q.931/921
  • ETSI 300-011 (Layer 1)
  • ETSI 300-125 (layer 2)
  • ETSI 300-102 (layer 3)*
  • Approved to TBR3


  • RJ45 100Ohm balanced
  • Support for SPIDs and Auto-SPID
  • NI-1 North American National
  • DMS-100 and 5ESS switch variants
  • AT&T TR-62411 and ANSI T1.403

Packet Ports (x4)

  • RJ45 standard twisted-pair CAT5E cable
  • Typical driving distance 500m–1,500m per Link depending on data rate and cable
  • Supports data rates up to 50Mbps full-duplex between two units
  • Provides management access to all units with Ethernet card in PC

Serial Control Port

  • Access password protected
  • Asynchronous, 8 data, 1 stop bit, no parity speed 19.2 to 115kbps

(1) Internal AC PSU

  • Standard IEC connector
  • 95-240 VAC; 15W; 47-63Hz
  • Auto-sensing
  • Standard IEC connector
  • Max consumption 0.2Amps RMS @230VAC

(2) Optional internal DC PSU (alt to AC)

  • Screw terminals
  • 37 to 67VDC
  • Meets ETS300-132-2
  • Max consumption typically 0.35Amps

Mechanical & Environmental

  • Metal chassis 292w x 200d x 44h mm-1U
  • Weight 1.1Kg
  • Optional 19” rack-mount kits.
  • Humidity 10-90% non-condensing


  • No user-serviceable parts
  • Battery for Real-Time Clock and NV RAM elements has a typical 10-year life
  • No maintenance required

All approvals completed in UK


  • TBR3:1995, 1997 Amendment
  • TIA/E1A-IS/968
  • CS03 Canada


  • EN55022:1988
  • EN55024:1988
  • EN61000-3-2/3:1995
  • AS/NZS CISPR22:2000


  • ACS/NZS60950:2000
  • AS/NZS3260:1993
  • ACA TS001:1997
  • IEC60950-1:2002 including National differences
  • RoHS Compliant