Telecom / Infrastructure

NAMC-STM1/4

Advanced Mezzanine Card (AMC) for Telecommunication Applications

Overview and Purpose

Both the NAMC-STM1 and the NAMC-STM4 are telecommunications interface boards in AMC (Advanced Mezzanine Card) form factor. The NAMC-STM1/4 is targeted at telecom applications dealing with Synchronous Digital Hierarchy (SDH), such as SS7, ISDN or 3G/3.5G mobile applications in optical OC-12/STM-4 and SONET environments.
Being equipped with an add/drop multiplexer/demultiplexer chipset the NAMC-STM1/4 is an ideal single board platform to interface between the frame oriented STM-4/SDH networks and classic TDM (Time Division Multiplex) standards as E1/T1/J1 or E3/T3/J3. Possible applications are i.e. add/drop or terminal mulitplexers.

Optical Interface

The optical 155Mbps OC3/STM1 line interface of the NAMC-STM1 and the 622Mbps OC-12/STM-4 line interface of the NAMC-STM4 are both available on standard OC-3/OC-12 SDH STM-1/STM-4 connectors at the front panel.

VT/TU Access

Both the OC-3/SMT1 and the OC-12/STM-4 framers are connected to an add/drop multiplex/demultiplex chipset. Since the chipset does the complete SDH pointer processing it is capable of accessing VT/TU tributary unit groups within the VC3, VC4 and VC4-4c virtual containers and thus to extract/insert any of the 84 T1/J1 or 63 E1 streams (NAMC-STM-1) or 4*84 T1/J1 or 4*63 E1 streams (NAMC-STM4) including the respective clocking information contained in a single STM-1 or STM-4 SDH frame. Supported mappings are VT1.5/VT-2 or TU-11/TU-12 to VC3/VC4/VC4-4c or STM4/STM4c. The chipset supports the M13 and G.747 multiplexing.

T1/J1/E1 Access

The multiplexer/demultiplexer chipset on the NAMC-STM1 includes 84 T1/J1 or 63 framers while the one on the NAMC-STM4 includes 4x84 T1/J1 framers or 4x63 E1 framers. Each framer has its individual Rx/Tx, CLK and SYNC signals. For T1 the framing standards SF, SLC-96 and ESF, for E1 G.704 and G.706 (CRC-4 multiframe), for J1 the TTC JT-G.704 as well CRC-6 calculation are supported. The chip also provides full jitter attenuation.

TDM and I-TDM Interface

The E1/T1/J1 framer interfaces to the onboard timeslot interchanger (TSI) chipset. The TSI as well as the TDM-to-I-TDM bridge are incorporated in an onboard FPGA. The TSI allows flexible routing as well as multicasting of 64kbps timeslots between the various E1/T1/J1 streams. The TDM-to-I-TDM bridge converts the TDM oriented bit stream into Ethernet packets and vice versa. The Ethernet packets are sent and received via either the AMC ports 0 or 1 (selectable) 1000BaseT-BX Ethernet interface (Fabric A). In addition to the I-TDM interface, as a breaking-through feature of the NAMC-STM4, the TSI offers an optional 32Mhz clocked H.110-like TDM backplane interface on the AMC extended connector.

I-TDM and Compliance
GigEth (Fabric A) at common options region
PICMG SFP.1 R1.0

TDM (option)
H.110 like 32MHz clocked TDM interface at extended option region

Networking
One OC-3 SDH/STM-1 (NAMC-STM1) or OC-12 SDH/STM-4 (NAMC-STM4) optical fibre interface on standard connector at front panel (SC duplex single or multi mode transceiver),
one GigEth at common options region (port 0 or port 1, selectable)

PCIe Interface and Compliance
X4 PCIe interface (optional)
PICMG AMC.1 R1.0

Indicator LEDs
4 software programmable LEDs at the front panel

Operating System Support
(host drivers)
OK-1, VxWorks, LINUX

Power Consumption
3.3V, 12V, 20W typ.

Environmental
Temperature (operating): 0ºC to +60ºC with forced air cooling,
Temperature (storage): -40ºC to +85ºC
Relative Humidity: 10% to 90% at +55ºC (non-condensing)

Applications
- high density multiplexers, multi-service switches, edge routers and digital modems
- Frame Relay switches and access devices
- SONET/SDH add drop and terminal multiplexers
- optical access equipment
- digital access cross-connect systems