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E1/T1 16 cPCI board

The E1/T1 16 cPCI board is a powerful building block in a wide array of Computer Telephony applications.
The PCI Bus and the H110 CTBus provide a standard interface to the rest of the system. 
 
 
Main features
  • 16 E1/T1 line interfaces
  • 16 HDLC channels
  • H.110 interface
  • 2048 timeslot switch matrix
  • 1-2-4 bit subchanneling support
  • 32 bit CompactPCI
  • Hot swappable (V 2.0)
  • Front status LEDs for each line
  • PLL clock synchronisation to internal or external source
  • Quality assured by ISO9001 certification
E1 T1 16 cPCI card

 

E1/T1 PCM Framers
The E1/T1 16 PCM card provides 16 E1/T1/J1 framers and Line Interface Unit for Long and Short Haul Applications. It can handle attenuated signals up to -43 dB at 1024 kHz (E1) and up to -36 dB at 772 kHz (T1/J1).
The transmit pulse shapes are programmable for E1 and T1/J1, as well as the Build-Out for CSU signals according to ANSI T1. 403 and FCC68: 0dB, -7.5dB, -15dB, -22.5 dB (T1/J1).
The physical interface offers low transmitter output impedance for high transmit return loss, tri-state function of the analog transmit line outputs, per channel power down. The transmit line monitor protects the device from damage.
Jitter specifications of ITU-T I.431, G.703, G.736 (E1), G.823 (E1) and AT&T TR62411 (T1/J1) are met.
Loss of signal indication has programmable thresholds according to ITU-T G.775, ETS300233 (E1) and ANSI T1.403 (T1/J1). 
Frame alignment for 2048 kbit/s is according to ITU-T G.704 (E1) and for 1544 kbit/s according to ITU-T G.704 and JT G.704 (T1/J1).
The supported frame formats are E1 Doubleframe, CRC Multiframe (E1), T1 4-Frame Multiframe (F4, FT), T1 12-Frame Multiframe (F12, D3/4), T1 Extended Superframe (F24, ESF), T1 Remote Switch Mode (F72, SLC96), with selectable conditions for recover/loss of alignment.
CRC4 to Non-CRC4 inter-working is according to ITU-T G. 706 Annex B (E1), error checking via CRC4 to ITU-T G.706 (E1); error checking via CRC6 to ITU-T G. 706 and JT G.706 (T1/J1).
Alarm indication signals and Remote Alarm management work according to ITU JT-G.704 in ESF-format (J1).
IDLE code can be inserted in selectable channels.
Diagnostic and statistical functions allow alarm and performance per second monitoring (CRC errors, framing errors, code violations, E bit and SA6 bit (E1) errors, errored blocks, PRBS bit errors), local and remote line or payload loop back (TR54016), programmable in-band loop code detection and generation (TR62411), pseudo random bit sequence (PRBS) generation and monitoring (framed or unframed) and single bit defect insertion.
 

Signalling controller
A signalling controller is available for each PCM line, which supports HDLC mode or transparent mode. It provides special hardware support for SS7 signalling according to ITU-Q.703.
The device works also as CAS/CAS-BR controller with last look capability, enhanced CAS- register access and freeze signalling indication.
DL-channel protocol for ESF format is according to ANSI T1.403 or to AT&T TR54016 (T1/J1). DL-bit access for F72 (SLC96) format (T1/J1). 
It generates automatically periodical performance report according to ANSI T1. 403. Multiframe synchronization and synthesis is according to ITU-T G.732 Automatic alarm insertion and detection (AIS and LOS in time slot 16).
Any combination of time slots is selectable for signalling-independent data transfer data transfer, including time-slot 0 S an 8...4-bit. FIFO buffers, 64 bytes long, allows efficient transfer of data packets to the CPU.
 

Line Interfaces
Software can select line terminations, 75 Ohm unbalanced and 120 Ohm balanced for E1 or 100 Ohm unbalanced  for T1.
16 triple leds (red yellow green) on the front panel, one for each PCM line, provide line status indications.
The 16 T1/E1 are connected through J5, the rear panel holds the 16 RJ11 connectors, these types of connectors allow a one slot card occupation.
 

H.110 Controller & Switch Matrix
The H.110 controller provides switching between the ECTF H.110 CTBus interfaces and the local resources (16 E1/T1 channels), or internally between the local resources. Each connection can be a 1-bit, 2-bit, 4-bit, or 8-bit. Up to 2048 connections are supported.
The ECTF CTBus uses the standard CTBus H.110 pins on J4.
The message mode function allows assigning a preset value to any output time-slot. Broadcast switching optionally distributes one incoming time-slot to different output time-slots. Conversely it is possible to generate one output time-slot consisting of several input time-slots. The specified input time-slots are logically AND or OR connected. The software has read access to the content of any input time-slot.
 

Clock Control 
Clock synchronisation is maintained by digital phase locked loop circuitry, which provides timing and synchronisation signals.
The board may be configured as Master or Slave with respect to H.110 and handles H.110 clock fallback rules.
The reference clock can be selected from any of the network interfaces, or from a dedicated external 2 MHz sinusoidal reference connected to a. dedicated microSiemens coax connector on the rear panel.
 

Compact PCI 
The E1/T1 16 PCM card provides a slave 33MHz 32 bit Compact PCI compliant bus interface (PCI v2.2). The bridge supports posted memory writes for best PCI performance.
The card requires a 3.3v supply, and it provides 3.3V signalling with 5V I/O tolerance on both the PCI and H.110 buses.
Version 2.0 of the card supports Hot Swap compliant with PICMG 2.1 R1.0, tolerance of Vcc from early power, tolerance of asynchronous reset, tolerance of pre-charge voltage, and Hot Swap Control/Status register.

The Injector/Extractor system provides protection from electrostatic discharge on board insertion. The board U-channel front panel with gasket assures electromagnetic protection.
The protection level meets the requirements of the IEEE 1101.10 Standard.

The board meets the electrical and mechanical requirements of CompactPCI Specification PICMG 2.0, and the extensions concerning usage of connector J5 for Computer Telephony applications, PICMG 2.5.
The main board is a 6U (233.35 mm by 160 mm) board size. The Rear Panel I/O is also 6U size (233.35 mm by 80 mm). The card occupies one slot.
The board uses standard 2 mm Type AB CompactPCI connectors.
 

Software & Drivers 
Drivers are available for many operating systems. Prisma Engineering can also provide custom versions of them on the basis of specific needs. 
 
 

E1/T1 16 cPCI board brochure  
 

Per informazioni: lsu@prisma-eng.it