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Metrodata ATM DSUs consist of a 2-port ATM switch and cell matrix with buffer storage for a number of ATM cells. The cell matrix is accessed from two interfaces which connect to a network on one side and to a User equipment on the customer side. The DSU is configured for service via a menu system which can be displayed on a terminal or PC workstation either locally or via a LAN.
A range of interfaces for both fibre and copper media are available. Separate models support native ATM traffic streams or Circuit emulation traffic for carrying video or voice bundles. Important features of all Metrodata DSUs are built in diagnostics for identifying device or network faults and Performance monitoring statistics which are stored for a 24 hour period.
- High Performance ATM Networking
- Conversion between WAN & local ATM or CE equipment
- European & North American interface standards supported
- Remote configuration and testing of units across the network
- User friendly set-up menus - easy to install & configure
- Comprehensive performance monitoring & diagnostics
- Integral SNMP management
- All units 19 inch rack-mountable, 1U high
- Optional -48 volt DC supply
Most ATM switches and network devices are designed primarily for the American market and are equipped with SONET or DS3 interfaces. In Europe, with its E1, E2, E3, E4 and SDH services, ATM equipment therefore must be connected to unfamiliar and unsupported
interfaces.
The Metrodata Switching DSU solves this problem by enabling both speed and interface conversion at an economic price. The ATM switching DSU is a 2-port ATM switch that can be configured to a wide choice of interface standards to provide the link between the Customer premises and the Carrier's WAN.
The Switching DSU can also be used to interconnect ATM services between two Carrier WANs with different speed and interface characteristics.
Product Features
The DSU has two sets of ATM interfaces. Cell traffic received at either of these interfaces is analysed for errors and idle cells are deleted. Good traffic is then forwarded to the switch matrix in the DSU. If bandwidth is available traffic passes through the switch matrix to the other interface. If bandwidth is not immediately available, traffic is held in buffer storage within the DSU. This storage permits the DSU to operate the interfaces efficiently at different speeds. If the buffer store becomes full, then cells are discarded until space becomes available. If there is no traffic queued, the DSU transmits idle cells in lieu of traffic.
The DSU stores performance data for the preceding 24 hours of operation, thus providing a substantial database for assessing the performance of the networks, lines and connected equipment. Front panel lights give indication of major and minor alarms. The DSU provides a test mode to carry out local Loopback tests which segment the link and assist in locating faults. Line performance statistics gathered by the DSU can then be used to pinpoint data loss.
A LAN port on the DSU is provided to permit remote management of the DSU and SNMP can be used to manage the unit as a part of a wider network.
Application Diagram
Singlemode Short Haul Interface
| Port |
G.957 |
| Interface |
Dual SC Singlemode 8/125um |
| Wavelength |
1310um |
| Tx Power |
-8 dBm to -15 dBm |
| Max Rx input power |
-8 dBm |
| Rx Sensitivity |
-8 to -31 dBm |
| Optical Loss Budget |
-15-(-31) = 16dB |
Singlemode Long Haul Interface
| Port |
G.957 |
| Interface |
Dual SC Singlemode 8/125um |
| Wavelength |
1310um |
| Tx Power |
0 dBm to -5 dBm |
| Max Rx input power |
-8 dBm (may need attenuator |
| Rx Sensitivity |
-8 to -34 dBm |
| Optical Loss Budget |
-5-(-34) = 29dB |
Multimode Fibre Interface
| Port |
G.957 |
| Interface |
Dual SC Multimode 62.5/125um |
| Wavelength |
1310um |
| Tx Power |
-14 dBm to -19 dBm |
| Max Rx input power |
-14 dBm |
| Rx Sensitivity |
-14 to -30 dBm |
| Optical Loss Budget |
-19-(-30) = 11dB |
SDH/Sonet BNC Electrical Interface
| Physical |
BNC (75 ohm) balanced |
| Cable |
75 ohm co-ax |
| Encoding |
CMI |
| Cable Lengths |
RG59 = 70m |
| |
UR202 = 80m |
SDH/Sonet RJ45 Electrical Interface
| Physical |
RJ45 (120 ohm) unbalanced |
| Cable |
75 ohm STP |
| Encoding |
NRZ |
| Cable Lengths |
RG59 = 70m |
| |
UR202 = 80m |
SDH/Sonet ATM Interface Higher Layers
| Rate |
155.52Mbps per G.957 |
| Cable |
Sonet/STS-3c SDH/STM-1 per G.709 |
| Encoding |
I.432 |
| Clocks |
Internal, Loop, Though |
| Physical |
BNC (75 ohm), G.703, HDB3 |
| Rate |
2.048Mbps +/- 50ppm per G703 |
| Framing |
G704 |
| High Level Framing |
ETS300-213 or G804 |
| Jitter |
Per G823 |
| Clocks |
Internal, Loop, Through |
| Physical |
BNC (75 ohm), G.703, HDB3 |
| Rate |
8.448 Mbps +/- 30ppm per G703 |
| Framing |
G804, G832 |
| PLCP |
None |
| Jitter |
Per G823 |
| Clocks |
Internal, Loop, Through |
| Physical |
BNC (75 ohm), G.703, CMI |
| Rate |
34.368Mbps +/- 20ppm per G703 |
| Framing |
G804, G832 |
| PLCP |
None |
| Jitter |
Per G823 |
| Clocks |
Internal, Loop, Through |
| Physical |
BNC (75 ohm), G.703, CMI |
| Rate |
139.264Mbps +/- 15ppm per G703 |
| Framing |
G804, G832 |
| PLCP |
None |
| Jitter |
Per G823 |
| Clocks |
Internal, Loop, Through |
| Physical |
BNC (75 ohm), G.703, CMI |
| Rate |
44.736Mbps +/- 20ppm per G703 |
| Framing |
T1.107/107a |
| PLCP |
Tr-TSV 000 773 |
| Jitter |
Per G823 |
| Clocks |
Internal, Loop, Through |
| Environment |
| Temp |
0 - 50 deg |
| Humidity |
0 - 95% RH, non condensing |
| Pressure |
86 - 106 KPA |
| Power Supply |
| AC Mains |
100 - 250VAC, 50-400Hz, 250mA, IEC connector |
| DC Power |
-36 to -72 VDC, 200-100mA |
| Packaging |
| Type |
1U, 19inch rackmount |
| Dimensions |
425 x 213 x 44 (W x D x H) |
| Compliance |
| Safety |
EN60950 |
| EMC |
EN55022, EN50082 |
| Management |
RFC1213 (MIBII), RFC1495 (Telnet), RFC1157 (SNMP), RFC1406 (DS1/E1), Metro MIB (DSU), RFC1215 (Traps) |
| Statistics |
G.821, AT&T54016:15min, 24hr totals |
| Status & Diagnostics |
| Loopbacks |
Local per port |
| L0/1 Stats |
Transmission faults |
| L2 Stats |
Cell throughput, good cells, bad cells, corrected cells |
| Alarms |
| Line |
Major, Minor |
| UNI |
ATM Uni Fault |
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Part Number |
| Two Electrical ATM Interfaces |
100-250 AC Mains |
-48 DC Power |
| E3 - E1 |
80-10-002 |
80-22-002 |
| E3 - E2 |
80-10-009 |
80-22-009 |
| DS3 - E1 |
80-10-003 |
80-22-003 |
| DS3 - E2 |
80-10-010 |
80-22-010 |
| DS3 - E3 |
80-10-016 |
80-22-016 |
| STM1 RJ45 NE - E1 |
80-10-100 |
80-22-100 |
| STM1 RJ45 NE - E2 |
80-10-101 |
80-22-101 |
| STM1 RJ45 NE - E3 |
80-10-102 |
80-22-102 |
| STM1 RJ45 NE - DS3 |
80-10-103 |
80-22-103 |
| STM1 RJ45 NE - E4 |
80-10-104 |
80-22-104 |
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Part Number |
| Fibre to Electrical ATM Interfaces |
100-250 AC Mains |
-48 DC Power |
| STM-1 MM SC - E1 CE |
80-10-050 |
80-22-050 |
| STM-1 MM SC - E2 CE |
80-10-052 |
80-22-052 |
| STM-1 MM SC - E3 CE |
80-10-054 |
80-22-054 |
| STM-1 MM SC - DS3 CE |
80-10-056 |
80-22-056 |
| STM-1 MM SC - E4 CE |
80-10-058 |
80-22-058 |
| STM-1 SM SH SC - E1 CE |
80-10-051 |
80-22-051 |
| STM-1 SM SH SC - E2 CE |
80-10-053 |
80-22-053 |
| STM-1 SM SH SC - E3 CE |
80-10-055 |
80-22-055 |
| STM-1 SM SH SC - DS3 CE |
80-10-057 |
80-22-057 |
| STM-1 MM SC - E4 CE |
80-10-059 |
80-22-059 |
| STM-1 SM LH SC - E1 CE |
80-10-111 |
80-22-111 |
| STM-1 SM LH SC - E2 CE |
80-10-112 |
80-22-112 |
| STM-1 SM LH SC - E3 CE |
80-10-113 |
80-22-113 |
| STM-1 SM LH SC - DS3 CE |
80-10-114 |
80-22-114 |
| STM-1 MM SC - E4 CE |
80-10-115 |
80-22-115 |
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