FEATURES
- 2-wire MSDSL modem with remote management,
extending data transmission to 6.6 km (4.1 miles) over 24 AWG line
- Supports multiple data rates between 64
kbps and 2304 kbps
- Utilizes MSDSL 2B1Q line coding for
extended range and improved quality
- Supports variety of digital interfaces:
- RS-530
- V.35
- V.35A
- X.21
- V.36/RS-449
- G.703 E1
- Ethernet (IR-ETH, IR-ETH/Q or IR-IP)
- Provides an embedded operation channel for
end-to-end system management and supervision
- Setup, control and monitoring via an ASCII
terminal connected to the ASMi-51 supervisory port
- Extensive diagnostics, including loopbacks,
BER testing and MSDSL performance monitoring
- Automatic rate detection in external clock
mode for tail-end applications of standalone ASMi-51 units
- High voltage line protection in compliance
with ITU K.21
- Available as quad or dual-modem card for
RAD's LRS-24 modem rack with SNMP management
SPECIFICATIONS
- ASMi-51, Multirate Single Pair Digital Subscriber
Line (MSDSL) modem, which operates in full duplex over 2-wire line.
- ASMi-51 supports multiple data rates,
user-selectable to n ? 64 kbps, where n = 1, 2, ..., 32, 36.
- ASMi-51 employs MSDSL 2B1Q technology to extend the
transmission range (see Table 1) and provide efficient transmission, even
over poor quality lines.
- ASMi-51 supports a wide range of digital
interfaces: RS-530, V.35, V.35A, X.21, V.36/RS-449, G.703 E1. In addition,
the modem supports Ethernet interface modules with a built-in bridge (IR-ETH,
IR-ETH/Q) or an IP router (IR-IP), which allow LAN-to-LAN connectivity
using MSDSL technology.
- The modem uses an Embedded Operation Channel (EOC)
for controlling and monitoring the remote unit. The management channel
operates without interfering with data transmission.
- ASMi-51 is managed via an ASCII terminal connected
to the modem's supervisory port. The ASMi-51CQ and ASMi-51CD modem cards
installed in the LRS-24 modem rack can also be managed via RADview SNMP
network management application. The embedded menu-driven management
software allows to control the following parameters:
- Baud rate selection (when the modem is configured
as Central)
- Clock source selection
- Loopback and BERT activation
- MSDSL statistics collection
- Real time alert of fault conditions
- Installing new software releases.
- When set to external mode, the standalone ASMi-51
automatically detects the clock rate coming from the digital interface and
sets the remote unit to the same rate. When the digital interface rate is
changed, both local and remote units follow the new rate and synchronize
accordingly.
- The ASMi-51 system configuration is stored in a
Flash memory, minimizing system downtime when power is down or when a
remote unit is replaced.
- ASMi-51 performs call-out via its control port to
report the system alarms. The port can be configured to relay all alarms
or only the major ones.
- ASMi-51 has comprehensive diagnostics capabilities
that include the following test options:
- V.54 local analog and remote digital loopbacks
- RAD's proprietary channel loopback (local digital
loopback), which allows the DTE interface testing without losing
synchronization between two modems
- BER testing as per V.52
- MSDSL statistics collection.
Table 1. Typical
ASMi-51 Ranges over 24 AWG
|
Data Rate
|
Range
|
|
kbps
|
km
|
miles
|
|
64, 128, 192
|
6.6
|
4.1
|
|
256
|
6.2
|
3.9
|
|
320, 384
|
5.9
|
3.6
|
|
448
|
5.7
|
3.5
|
|
512
|
5.5
|
3.4
|
|
576, 640
|
5.2
|
3.2
|
|
704, 768
|
4.9
|
3.0
|
|
832
|
4.6
|
2.9
|
|
896, 960
|
4.5
|
2.8
|
|
1024
|
4.4
|
2.7
|
|
1088, 1152
|
4.2
|
2.6
|
|
1216, 1280
|
4.1
|
2.5
|
|
1344-1536
|
3.7
|
2.3
|
|
1600-2048
|
3.2
|
2.0
|
|
2304
|
3.0
|
1.8
|
ORDERING INFO
ASMI-51/AC/BNC
ASMI-51/AC/UTP
ASMI-51/AC/UTP/Q
ASMI-51/AC/V35
APPLICATION
Figure 1. Central Site Application
Figure 2. Central Site Application with SNMP Management
|
