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Dialogic DSI SS7LDH4 Network Interface Board
Low Density Signaling for Effective Value-Added Services

Dialogic DSI SS7LDH4 Network Interface Board

Dialogic Products
Signaling Boards
Dialogic DSI SS7LDH4Q Network Interface Board, PCI Express, 4 T1/E1, 4 LSL
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The Dialogic DSI SS7LDH4 Network Interface Board offers SS7 network connectivity to service nodes handling low volumes of signaling traffic (for example, 200 calls per second or less), and its half-sized PCI Express form factor helps reduce deployment costs. These characteristics, in addition to the ability to choose a bundle of circuit protocols in capacities suitable for small configurations, can help businesses meet the price points needed for success in a highly competitive segment of the market.

The DSI SS7LDH4 can deliver cost-effective signaling functionality for value-added services, such as call completion, prepaid calling, and call routing applications.

The DSI SS7LDH4 supports the Dialogic DSI SS7 Stack, allowing API-level compatibility with applications developed for other Dialogic DSI SS7 Boards, including the Dialogic® DSI SPCI Network Interface Boards. Application development for the SS7LDH4 is accelerated by a comprehensive suite of test utilities, sample code, and user-part programming guides.

Easy Migration for Existing Signaling Applications

Existing signaling-only applications that are currently deployed with DSI SPCI Network Interface Boards and that use Dialogic DSI APIs or the Dialogic Global Call API for SS7 can be executed with minimal configuration changes on systems configured with the DSI SS7LDH4.

Features and Benefits:

Features Benefits
From 2 to 16 low-speed MTP links Provides a choice of densities
Board and protocol license packages Allows the purchase of a capacity that helps make a solution more price-competitive in low traffic markets
Half-length, PCI Express form factor Permits the use of lower-cost rack-mount servers design for small footprint peripherals
Development package of programming aids, configuration tools, and run-time management and monitoring facilities Enables rapid development  of robust, scalable applications


Technical Specifications
Digital interfaces
  • 4 T1, E1 (software selectable on a per trunk basis)
  • High impedance selectable for monitoring
  • Selectable synchronization source from any line interface
Telecom clock management
  • Configurable LT (clock slave) or NT (clock master) mode
  • Internal and external loop back capability
Pulse mask
  • T1 ANSI T1.403
  • E1 ITU-T G.703
Data rate
  • T1 1544 kbps ± 50 ppm
  • E1 2048 kbps ± 50 ppm
Frame format
  • T1 D3/D4 and ESF
  • E1 and E1-CRC4
Line codes HDB3, B8ZS
Connector type RJ-48C
Maximum boards/system 16
Host interface
  • PCI Express compatible as a 1-lane that can be installed in 1, 4, 8, or 16 lane PCI Express slots
  • Bus speed 1 x PCI-Express lane (2.5 Gbps, full-duplex)
Channelized links
  • 2 or 4 channelized 64 kbps MTP Low Speed Links (LSL)
  • High impedance monitoring of 4 or 8 uni-directional links
Protocol execution MTP2 onboard, higher levels on host
Network protocol execution SS7 (MTP1 & MTP2)
HDLC monitoring Passive monitoring of HDLC format data links including, SS7, LAPB, LAPD, ISDN, and DPNSS
Form factor x1 standard height, half-length board
Length 16.8 cm (6.6 in) maximum
Height 11.1 cm (4.3 in) maximum
Power Requirements
+12 VDC power 0.25 A max
+3.3 VDC power 1.8 A max
Power dissipation 8.94 W max
Equipment Type
Equipment Type GEMP
Environmental Requirements
Operating temperature 0°C to +55°C
Air flow 1.5 Mbps (300 LFM)
Storage temperature –20°C to +70°C
Relative humidity 8% to 80% non-condensing
Altitude 0 to 15,000 ft
Safety and EMC
Canada ICES-003 Class A, CSA 60950-1 2nd Ed.
Europe EN60950:2006 w/A11:2009, CISPR 22 Ed 5.2b:2006 Class A, EN55022:2006 w/A1:2007 Class A, EN55024: 1998 w/A1:2001, A2:2003
United States FCC Part 15 Class A, UL 60950-1 2nd Ed.
CB Scheme IEC 60950-1 2nd Ed.
United States TIA-968-B
Canada CS-03 Issue 9
Europe TBR 12 and 13
Warranty 3-Years


Download the Dialogic DSI SS7LDH4 Network Interface Board Datasheet (.PDF)


Dialogic Products
Signaling Boards
Dialogic DSI SS7LDH4Q Network Interface Board, PCI Express, 4 T1/E1, 4 LSL
Get a Quote!