The PacketBand-ISDN-P delivers transparent switched PRI ISDN synchronous data services across asynchronous packet networks for PRI interfaces.

PacketBand-ISDN-P diagram


The PacketBand-ISDN range transports 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 be used by 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 which can, importantly, "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.

ISDN 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.

“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 of up to 32 “B” channels 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.

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. PacketBand is also able to delete/add/modify CLIs, down to an individual "B" channel, and this can be useful for billing purposes.

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.

PRI Port Options – Select NT or TE ports, choose E1 or T1, add tone generation, and inhibit particular information elements on a per-port basis. There are advanced options to allow connection to a wide range of ISDN devices supporting specific operating protocol. Two pairs of ports are connected by relays which will close on power failure, connecting the two ports, for resilience purposes, via a metallic path.

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.


PRI Interfaces



Packet Ports (x4)

Serial Control Port

(1) Internal AC PSU

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

Mechanical & Environmental

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