ASM-40
High Speed Short Range Modem• Transmit and receive timing canbe provided internally, or derived
externally from the data terminalor receive signal. Internal FIFOs
provide jitter attenuation or phasedifference correction either fromthe incoming analog signal (lineside) or from the external clock on
the DTE side.

• ASM-40 has comprehensiveFEATURES• High speed, synchronous

short range modem• Operates in full duplex overunconditioned 4-wire lines
or BNC coaxial cable• Utilizes HDB3, AMI or B8ZS
line coding for extending theoperation range to 1.75 km(1 mile)• Operates at 2048, 1544,1536, or 1920 kbps line rate
• Supports a wide range ofserial and Ethernet DTE
interfaces, operating at
13 user-selectable data rates• Can be used in rate andinterface conversion
applications• Conforms to special telecom
standards (Austel, TUV,BABT etc)
• Provides extensive
diagnostics, including
loopbacks and BER testing• Available as a card for RAD’s
ASM-MN-214 card cageDESCRIPTION• ASM-40, a synchronous shortrange modem, operates in full
duplex over 4-wire lines or BNC
coaxial cable. The modem
extends data transmission range
for up to 1.75 km (1 mile).

• ASM-40 employs HDB3, AMI or
B8ZS line coding in compliancewith the G.703 standard
requirements.

• ASM-40 supports a wide range ofserial and Ethernet interfaces,
including V.24, V.35, X.21, V.36,
RS-530, G.703-HDB3, G.703
Codirectional, IR-ETH (Ethernetbridge), Ethernet bridge, Ethernet
bridge with VLAN support,
Ethernet/Fast Ethernet bridge withVLAN support, IP router.

• The modem line rates support

different data rates, which enables
ASM-40 to be used as a rate
converter:2048 kbps – 32, 64, 128, 256,512, 1024 and 2048 kbps
1536 kbps – 192, 384, 768 and
1536 kbps
1544 kbps – 1544 kbps
1920 kbps – 1920 kbps.

• ASM-40 operation complies with
the AUSTEL (A95/76A/0020),
TUV (E9471050.01), BABT and
NET-1 requirements.

diagnostics capabilities that
including:
Local analog, remote digital andlocal digital loopbacks incompliance with ITU V.54
requirements
Built-in pattern generator andtester in compliance with ITU
V.52 requirements.

• ASM-40 is also available as aplug-in card for RAD’s
ASM-MN-214, 19-inch card cage.

ASM-40High Speed Short Range ModemSPECIFICATIONS• ImpedanceLINE INTERFACE• Line Type
Unloaded 4-wire twisted pair,
19 to 26 AWG
BNC coaxial cable, 75Ω• Line Code• Connector

75Ω for 2048 and 1920 kbps,
unbalanced (BNC coax)100Ω for 1544 and 1536 kbps,
balanced120Ω for 2048 and 1920 kbps,
balanced

DB-15 or 5-clip terminal block:100Ω for 1544 kbps and1536 kbps, balanced120Ω for 2048 kbps and1920 kbps, balanced
BNC coax:
75Ω for 2048 and 1920 kbps,
unbalanced• Return Loss

Better than 15 dB

User-selectable: HDB3, AMI or
B8ZS• Attenuation

Up to 40 dB• Framing• Range

Unframed

1.75 km (1 mile) over 24 AWG
wire• Transmit Level

According to G.703• Line Rate

2048, 1544, 1536, 1920 kbps

APPLICATIONSCentral Site

Remote Site
ASM-40/R
V.35(256 kbps)

2048 kbps

V.35(256 kbps)

ASM-40PublicNetwork

V.35(256 kbps)

2048 kbps

ASM-MN-214

RouterASM-40

RouterFigure 1. Point-to-Point Interface and Rate Conversion Application

Receive
Clock

External
Clock

ReceiveClock1.75 km (1 mile)ASM-40InternalClock1.75 km (1 mile)ASM-40

ASM-40DTE

ASM-40DTE

Figure 2. Tail-End Application for DDS ServiceASM-40
High Speed Short Range ModemDTE INTERFACE• TypeV.24: 25-pin, D-type, female
V.35: 34-pin, female
X.21: 15-pin, D-type, female
RS-530: 25-pin, D-type, female
V.36: via adapter cableconverting between RS-530
connector and 37-pin, D-type,female connector
G.703-HDB3: 15-pin D-type,female or BNC coax
G.703 Codirectional: 5-clip
terminal block or RJ-45
IR-ETH (Ethernet bridge): RJ-45
or BNC coax
IR-ETH/Q (Ethernet bridge withVLAN support): RJ-45
IR-ETH/QN (Ethernet/Fast
Ethernet bridge with VLAN
support): RJ-45
IR-IP (IP router): RJ-45• Data Rate

32, 64, 128, 192, 256, 384,512, 768, 1024, 1536, 1544,
1920 or 2048 kbps
G.703-HDB3: 128, 256, 512,1024, or 2048 kbps
G.703 Codirectional: 64 kbps

• Signal Attenuation (G.703/HDB3)
6 dB• Output Level (G.703/HDB3)±3V

GENERAL• Timing
Internal, from internal oscillator
External, from attached DTE
Receive, from received signal• Diagnostics

Loopbacks:Local analog loopback incompliance with ITU V.54
Remote digital loopback incompliance with ITU V.54
Local digital loopback incompliance with ITU V.54
BER testing:
Built-in pattern generator andtester in compliance with V.52
requirements• Indicators

PWR (green) – PowerRTS (yellow) – Request to Send
DCD (yellow) – Data Carrier
DetectTD (yellow) – Transmit Data
RD (yellow) – Receive Data
TST (red) – Test
ERR (yellow) – Error• PhysicalASM-40:Height: 443 mm / 1.7 in
Width:
214 mm / 8.4 in
Depth:
258 mm / 10.1 in
Weight 0.88 kg / 1.9 lb
ASM-40/R:Fits one slot in the ASM-MN-214card cage

• Power

AC: 100 to 240 VAC (±10%),50 to 60 Hz, 6.8 VA max
DC: 24 VDC (18 to 36 VDC) or-48 VDC (-36 to -72 VDC), 5.7W

• Environment

Temperature: 0–50°C/32–122°F
Humidity:
Up to 90%,
non-condensing

ASM-40High Speed Short Range ModemORDERING
ASM-40/*/#/@High speed short range modem
ASM-40/R/@
High speed short range modem, cardversion for ASM-MN-214 card cage
Note: When using V.35, X.21, V.36 or one ofthe Ethernet interface modules, a specialinterface adaper is required.

* Specify power supply:
AC for 100 to 240 VAC
24 for 24 VDC
48 for -48 VDC# Specify line connector:
TB for balanced terminal blockconnector
B for balanced DB-15 connector
UB for unbalanced BNC coax
connector@ Specify DTE interface:
V24 for V.24 interface
V35 for V.35 interface
X21 for X.21 interface
530 for RS-530 interface
703TB for G.703 Codirectional
interface, terminal blockconnector
703RJ for G.703 Codirectional
interface, RJ-45 connector
703 for G.703-HDB3 balancedinterface
703UB for G.703-HDB3unbalanced interface
UTP for IR-ETH module, RJ-45
connector
BNC for IR-ETH module, BNC
coax connector
UTP/Q for IR-ETH/Q module
UTP/QN for IR-ETH/QN module
IP for IR-IP module

CIA/$Connector interface adapter for theASM-MN-214 modem rack
$ Specify CIA type:
V35/1 for converting one DB-25
DTE connector into one 34-pin
connector
X21/1 for converting one DB-25
DTE connector into one DB-15
connector
ETH for converting one DB-25
DTE connector into one RJ-45
connector
TB-BNC/214 for converting oneterminal block line connector
into two BNC coax connectors
CBL-530/449F
Adapter cable converting one DB-25
connector into one DB-37 connector
RM-28
Special hardware for mouinting one
or two ASM-40 units in a 19-inch
rackdata communications
www.rad.com
International Headquarters
24 Raoul Wallenberg Street
Tel Aviv 69719, Israel
Tel: (972) 3-6458181
Fax: (972) 3-6498250, 6474436
Email: rad@rad.co.il

U.S. Headquarters
900 Corporate Drive
Mahwah, NJ 07430
Tel: (201) 529-1100
Toll free: 1-800-444-7234
Fax: (201) 529-5777
Email: market@radusa.com
606-100-10/02

 1989–2002 RAD Data Communications Ltd.
All other trademarks are the property of their respective holders.

Specifications are subject to change without prior notice.