The popular Liberator "S" is a highly flexible ISDN Converter, ISDN Splitter, Switch, and Concentrator.

The Liberator models detailed within this document support up to 4 E1/T1/PRI interfaces and 0, 4, 8, 12, or 16 BRI ‘S’ interfaces. See the Ordering Information PDF for details. As standard Liberator ‘S’ can be user configured with either all E1 or all T1 PRI interfaces. Purchasing the optional E1 T1 conversion pack means both E1 and T1 can be supported on the same unit. The BRI ports are supplied as standard to be NT presentation  (simulates a network and connects to CPE). Optional software pack enables BRIs to be user-configured as NT or TE (simulates CPE and connects to a network) in blocks of 4.

ISDN Services
Signaling is carried/converted between ports and ISDN types including when converting between ETSI and ANSI standards. Supplementary Services from the network are passed transparently to local devices. Sub-addressing handling and routing is supported, as is the ability to route on Bearer Capability (call type). CLIs can be locally generated and SPIDs (US - based BRIs) are supported.

Full version of DbManager
showing all management
windows and image of unit to
which the DbManager has
connected.

Configuration/Management
Liberator is configured and managed by Patapsco’s DbManager. See separate Tech Sheets. DbManager is an intuitive GUI which supports multiple real-time workstations and is the common platform for all Patapsco products. Versions are available which can be configured for the smallest installation, or up to many thousands of devices. Configuration/management sessions can be established remotely via an ISDN call or locally through the unit’s LAN/Ethernet port or the  RJ serial port. SNMP Traps & Alarms are supported as is a call analysis tool.

These Groups form the basis of all configurations, making it fast, simple and intuitive to your applications. As an example you can refer to a Group of 4 BRI ports as ‘Video 1’ and subsequently use this term on all routing parameters. ‘Hunt Groups’ or ‘rotaries’ are as easy to establish.

Call Routing
Calls can be routed on the number dialled,the sub-address, CLI, Call Type, originating port, time-of-day or a combination of the above. Whatever your routing requirements; Liberator can help.

Cross-Connection
Any ‘B’ channel can be connected to any other within Liberator without constraints (unless some are programmed). Any port can be barred from calling any other port or number. Any call can be routed to a Group of ports or ‘hunt-group’. Multiple devices can be configured to accept calls dialling to a range of numbers and the calls can be routed to a Group in a variety of ways (sequential, always the lowest available port etc). Incoming calls can be automatically rerouted to alternate pre-programmed destinations if the main number is busy or unavailable, or after a set time (1-20 seconds).

Redirection on ‘Busy’ or ‘Unavailable’
Incoming calls can be automatically rerouted to alternate pre-programmed numbers, Groups or ports if the main number or port is unavailable. This gives the ability to automatically switch to backup or standby device for resilience purposes. Liberator supports a Secondary and Tertiary destination or Routing Profile. If an out-going call to the ISDN network cannot be established (user or network busy, for example), Liberator can automatically redial via other network ports without the end user having to take any action. The same can be done for incoming calls switching between local devices.

E1 to T1 Conversion
Liberator can optionally convert between E1 and T1 PRIs. Note that as standard Liberator converts between any PRI type and any BRI type (ETSI/ANSI). Liberator supports the necessary A-Lau to μ-Law encoding conversion necessary for voice traffic.

Nailed Calls
Timeslots or ‘B’ channel capacity can be established on behalf of devices which are unable to handle dialling protocols. For example, Liberator can provide capacity for non-switched Fractional E1 and T1 circuits. These ‘Nailed’ calls can be configured as temporary or permanent, giving the ability to profile capacity to match needs.

Channel Reservation and Scheduling
This features has the ability to change and structure profiles in an efficient way and to vary them if your routing or capacity
requirements change during the day or week.

Time-of day
A Group can reserve a number of channels based on the time-of day.

A Group can also be configured to have a Minimum and Maximum number of destination channels available and reserved for the Group’s use. This facility gives flexibility when allocating network access to different devices, allowing each to have a reserved minimum capacity available for immediate use. Setting the maximum capacity means the ISDN devices can share and contend for the remaining ‘B’ channels yet any device cannot take an unfair proportion. The Maximum and Minimum access rates can be varied based on day and time. Up to eight different profile schedules can be configured per Group. If any schedules overlap, a warning is given.

Least-Cost-Routing
A number of options are available to assist with selecting the best route. Calls beginning or ending with particular numbers can be routed to a specific Group or ‘B’ channel. Additional Ports can be configured as secondary/tertiary destinations should the preferred Port(s) be busy or unavailable. See also the section above on ‘Redirection’ when a route or destination is unavailable. Liberator has the ability to convert or translate any incoming or outgoing number into any other number, to add/remove leading, middle and trailing digits. See below ‘Number Translation’.

For example an incoming call to 12345 may be converted to 98765 because the original extension at 12345 has moved onto a VoIP gateway on a different ISDN PRI and now the users has a different DDI number. Liberator can convert/add/delete leading digits, digits in the middle of numbers and/or trailing digits. It can also manipulate subaddresses and CLIs. All of this flexibility is not required by all, but if you should need it, it is easy to use and configure.

Tone Generation
Liberator normally passes the tones transparently between ISDN points but this is not always possible in all instances, such as some least-cost routing applications, if there is no network at all, or in certain other circumstances such as when Liberator cannot make a final routing decision until the number is dialled. In these instances, Liberator can be configured to generate dial, ring, busy, N/U tones itself.

CLI Generation
Liberator is able to generate a CLI field. The number of the CLI can be programmed for individual ports or calling numbers.

Power Feed (Phantom Power)
Some ISDN devices do not have a power supply and are powered through the BRI interface. Liberator optionally supports Power Feed for BRI NT interfaces. This must be specified at the time of ordering and cannot be retrofitted

General

Clocking
Software-selectable clock source using any E1/T1/PRI port, any BRI NT interface , or Internal Clock. Auto-switchover to secondary/tertiary clocks on clock loss. Up to 19 different hierarchical clock sources can b configured. Internal clock accurate to +/- 25ppm.

Real-Time Clock
Internal battery-backed real-time clock for Event Log time-stamps and debugging purposes.

Events
Up to 5000 Events are held within the Liberator in NV RAM on a FIFO basis Events include all call information such as port dialling, number dialled, subaddress, time of call and time of call clear-down, time of incoming call and to which port and if there is a CLI attached, time of clear-down and which ‘end’ cleared. Events can be reported automatically to the DbManager or other tools via an ISDN call, the local Console port or across the LAN. This can be on a timed schedule or when the Event Log reaches 90%. Once Events are successfully reported to the DbManager the log is cleared. DbManager can also access the logs and download them when required. DbManager writes all Events and Alarms to a flat .csv file in real-time and this file can be manipulated by external tools to format and extract information, for example for billing.

Routing and Prioritisation Summary Windows
A choice of easy-to understand summary windows display the routing configurations. These include a complete display of all routing profiles, their order of priority, names, numbers, ports etc. These windows are particularly useful in more complicated configurations with multiple network ISDNs, multiple local ports/devices and perhaps re-direction facilities.

Diagnostics
Liberator provides excellent diagnostic and debug tools with visibility of all routing decisions taken across the unit and all messages from attached devices. Patapsco have available a conversion program that can convert raw ISDN Layer 2 and 3 messages into more comprehendible English.

Approvals
The Liberator “S” benefits from a wide range of approvals for connection to ISDN services. See Section 5.8. All Patapsco equipment is RoHS compliant without having to resort to the use of temporary “Exemptions”.

Configuration
Held in non-volatile RAM (retained during power-off) and downloadable to/from the DbManager. Configuration files can be
saved to a file on a PC.

Software
New versions of software can be remotely uploaded to Liberator via the DbManager. This is loaded to an off-line sector of FLASH and a confirmation check-sum given. The operator can switch software banks at any time and revert to the original software at any time. If the Liberator is unable to run from the new software, it will revert to the original.

Interfaces
PRI/E1/T1 - 1, 2, 3 or 4 PRI ports.
Marked as ‘PRI21’ ‘PRI22’ ‘PRI23’ and ‘PRI24’
By default PRI21 and PRI23 are configured for TE ISDN stack (user-side); PRI22 and PRI24 for NT (network-side)
The default configurations can be changed by the user - crossed cables are necessary.
Interfaces PRI21 - PRI22 and PRI22 – PRI24 are protected against power failure by relays which provide a metallic path in the event
of failure.

RJ45 120Ohm balanced (E1)
G.704 HDB3 encoded
Auto-detect CRC4 or non- CRC4 framing (Multiframe or Doubleframe)
Support of non-switched E1 and Fractional E1 services
ISDN PRI ETSI Q.931/921, ETSI-DSS1, ETSI 300-011, ETSI300-125, ETSI 300-102, approved to TBR4
A-Law and μ-Law tones

RJ45 100Ohm balanced T1
ESF or D4 Framing selectable
B8ZS or AMI Line code selectable
NI-2, DMS-100, AT&T 5ESS Switch selectable
AT&T TR-62411 and ANSI T1.403 Compliant
Hong Kong variant available
A-Law and μ-Law tones

Marked as ‘BRI1’ through to ‘BRI16’
RJ45
4-wire S0 compatible
Configured as NT but optionally user-switchable in blocks of 4 ports to TE mode (requires crossed cables)
BRIs can be user configured for US and ETSI on a per port basis
Can be configured for Point-to-Point or Multipoint
SPID settings for US-based applications.
Support for NI-1, DMS100, AT&T 5ESS and Auto Single and Dual SPID configurations
Driving distance on UTP CAT5 cable typically up to 750m depending upon DTE and environment
Optional Terminal Power-Feed with external 40VDC supply for NT ports. Provides 40V 1W to ISDN BRI devices which do not have
their own power supply.

RJ11 Marked ‘Cmd’

Asynchronous 8 data, 1 stop bit no parity 19.2kbps to 115kbps
Password protected
Dry contact alarm relay

Ethernet RJ45 Marked ‘LAN’ 10baseT or 100baseT

Password protected

LEDs

PRI x 4

Each PRI has 2 associated
LEDs
Upper LED - fl=synchronising synchronised to Layer 1; solid=Layer 2 established
Lower LED - fl=call establishing; solid=at least 1 call in place

BRI

Each BRI has 2 associated LEDs, 1 for each ‘B’ channel
Fl=call establishing/dialling; solid=call in place

Unlit=no power; Green=power on unit

Run x 1

Slow flash=microprocessor OK and configured; fast
flash=internal error or lost base configuration

LAN ACT x 1

Activity on the LAN

LAN 100 x 1

Off=LAN running at 10baseT; on=LAN running at 100baseT

Interfaces pairs PRI21 and PRI22 and PRI23 and PRI 24 are Power- Failure Relay protected Interfaces will be connected together using relays in the event of power failure. This forms a metallic path between the two ports.

Internal switch-mode supply IEC connector
Voltage range 95-240VAC auto-sensing
Input frequency 47-63Hz
Max current consumption 200mA @ 230VAC

Optional for Power Feed - required for non-powered attached user devices

In addition to AC power
External in-line supply
2.1mm jack
Voltage range 90-264VAC
Input frequency 47-63Hz
Current consumption 700mA @230VAC
Max DTE draw 1W @ 40VDC

4mm terminal block
-33VDC to -75VDC
0.35A max
MTBF 179,000 hrs

4mm terminal block
-18VDC to -75VDC
0.55A max
MTBF 800,000 hrs

Operating 0 – 55 °C
Humidity 10-90% non-condensing
Natural convection cooling

292mm wide x 200mm deep x 44mm high
Metal chassis, front and rear panels
Weight is 1.1Kgs 2.4lb
Optional 19’ rack-mounting kit

There are no serviceable parts or maintenance required.
The battery used for the real-time clock and some NV RAM elements has a 10 year (typical) life-time

All approvals completed in UK
Accredited laboratory - reports available
Telecomms
TBR12/TBR13
TBR4:1995, 1997 Amendment
TIA/E1A-IS/968
TNA117
AS-ACIF-S006/S016
CS-03 Canada
TIA-968-A USA
EMC
EN55022:1998
EN55024:1998
A12001
EN61000-3-2/3:1995
AS/NZS CISPR22:2000
Safety
IEC60950-1:2007
ACS/NZS60950:2000
AS/NZS3260:1993
ACA TS001:1997