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General
Port Specifications
Network Specifications
Operating Modes
Controls
Indicators (front panel)
Network Management Port
Data Ports
Voice Ports
Network Management Port Commands
Physical/Electrical
Options
How to Order
Manual Application
FEATURES
- 1, 2, or 4 voice channels
- FSX, FXO and E&M interfaces
- Toll quality voice at 7.2 Kbps
- Group 3 9600 bps fax
- Point to point operation
- Use over IP networks with Etherpath option
- Async composite up to 115.2 Kbps
- Sync composite to 128 kbps
- Available with 8 async data ports
- Use over DSU, modem, ISDN, wireless links
DESCRIPTION
The DCB SR Voice Multiplexer supports 1, 2, or 4 voice channels over sync or async links. In addition, the SR-VM is also available with 8 async data ports. The SR-VM will operate over DDS links, dial-up or private line modem links, ISDN, wireless modems, etc. The SR-VM can operate point to point over IP networks using the DCB Etherpath serial server. The SR-VM gives you toll quality voice using voice compression and digital echo cancellation. The fax function gives the user Group 3 fax transmission at 2.4 to 9.6 Kbps over the voice channel. The voice I/O cards have three RJ connectors per voice port for FXS, FXO, and E&M (Ear and Mouth) interfaces. The E&M interfaces are 4-wire E&M. The FXS interface connects to stations, which can be phones and key phone systems. The FXO interface connects to phone switches, such as phone company central office switches and PBX ports. The SR-VM supports off premise extension applications (FXO to FXS), Private Line Automatic Ringdown (FXS to FXS) and tie lines (E&M to E&M).
The data port option gives the user 8 statistically multiplexed async ports at speeds up to 38.4 Kbps each. The async ports have full flow control capabilities, supporting Clear to Send, Busy and Xon/Xoff. Each port can be set to a different speed. Data ports can be set to different speeds at each end of the link.
The SR-VM is easy to setup using the asynchronous network management port. Every SR-VM is shipped with adapters for connecting the network management port to either a PC (9 pin adapter) or to a terminal (25 pin adapter). Setup commands are simple and easy to understand. Help is always available by entering "h", "help" or "?". Setup is usually as simple as plugging in a telephone. If a particular system requires different phone audio levels, the SR-VM provides the option of changing the voice in and voice out levels.
The SR-VM may also bridge remote Ethernet LANs by adding an EtherSeries Bridge to one of the serial ports. Click here to go to the EtherSeries Bridge data sheet. The bridged connection speed is limited to 38.4 Kbps or less, depending upon other bandwidth utilization.
NOTE: Although the SR-VM will pass touch-tones and group 3 fax tones, it will not pass modem tones due to the voice-oriented compression methods.. Dial-up telephone line modems can not be used with this system between the modem and the telephone line. See this paper for details.
SPECIFICATIONS
General
Rates: Voice is compressed at 7200 bps Optional voice rates: 4800, 5333, 6400, 8000 and 9600 bps Group 3 fax at 2400 to 9600 bps over voice portsStatistical Multiplexing
0 or 8 channels
Ports can be set up to 38,400 bpsPort Specifications
Data Format
1 Start bit
8 Data bits including parity if used
1 Stop bit
10 Bits total
Rates: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400 bps individually selectable per port
Interface: CCITT V.24, RS-232-D, Optional RS-422/RS-232 external adapter
Connectors: RJ-45 (8-wire)
Buffering: 64K dynamically allocated
Port Flow Control: Set on an individual port basis for Xon/Xoff or Clear to Send
Network Port
RS-232 Network Port:
Rates up to 128 kbps sync, 115.2 kbps async Synchronous or asynchronous RS-232 May be used with wireless, DDS, fractional T1, satellite, dial-up, or dedicated digital linesControls
Front panel push button for loopback
Side door accessible firmware cartridge firmware upgrades
Setup via 9600 bps async network management port or "Port One Setup" (if optional data ports are installed)
DIP switch settings on rear to select FXS, FXO or E&M
Indicators (front panel)
Power, Activity, Line Error, Modem Ready, Port 1 Setup, LoopbackVoice Ports
3 - RJ45 jacks per voice channel, one each for FXS, FXO, and 4 wire E&MNetwork Management Port
Interface: CCITT V.24, RS-232-D
Connector: RJ-45 (8-wire)
Network Management Port to terminal cable includedNetwork Management Port Commands
Help Screen
Monitor Transmit
Monitor Receive
Network Loopback
Flow Control Active
Set Time
LOCAL: Show Configuration
Show Network
Configure Ports
Configure Network
Port Loopback
Device Type
Reset
Activity Counters
Voice Setup Commands
Set Conversion Rate
Set Jitter Buffer
Set ...
Show Voice
Physical/Electrical
- Power requirements: 120 VAC, external power supply, 50/60 Hz, 18 Watts
- 220 VAC, 24 VDC and 48 VDC also available as options
- Size: 10 1/4" x 9 3/4" x 2 1/4"
- Operating Temperature: -40C to +70C (non-condensing)
Options
- Multiple Voice ports: 1,2,4 ports
- Multiple Data ports: 0 or 8 data ports
- Ethernet network interface
Rear view of SR-VM with 8 data ports and 2 voice ports
APPLICATION
How to Order
The SR-VM voice multiplexer is no longer available and was replaced with the new lower-cost AVA - Audio Voice Adapter. Low bit-rate, high quality audio via RS-232 and other low speed serial links is now more economical than ever. The AVA is an economical Voice of product data sheet is here.
Data Comm for Business Inc.
2949 County Road 1000 E
Dewey, Il 61840Voice: 217-897-6600
Toll Free: 800-4-DCB-NET
Toll Free: 800-432-2638Email: Contact Page
Web: www.dcbnet.com
Fax: 217-897-1331Shopping cart is 
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