Alpha DOCSIS DM31 User manual

1017-891-B12-001, Rev. A (02/2023)
DM31 DOCSIS®3.1 Transponder for XM3™Power Supply
Quick Start Guide
Introduction
This guide describes the DOCSIS Monitor 31 (DM31) transponder and provides procedures with regard to installation in
the XM3 series broadband uninterruptible power supply (UPS). This guide also provides steps to verify correct network
provisioning on the DOCSIS network. For detailed information, refer to the DM31 Technical Manual available at
www.alpha.com.
Audience
This guide is intended for experienced, qualified and licensed installation personnel familiar with the mechanical and
electrical requirements of enclosure and power supply systems. Review the support documentation on the website to
become familiar with the features and functions of the equipment in this system before proceeding. Failure to install
and/or use this equipment as instructed in the system documents can result in a hazard to personnel or damage to the
equipment. This system is only serviceable by qualified personnel.
Overview
The DM31 unit is a DOCSIS 3.1 transponder designed to provide status and alarms from the XM3 broadband UPS to a
network monitoring system. The DM31 transponder utilizes Simple Network Management Protocol (SNMP), standard
SCTE-HMS and Alpha Management Information Bases (MIBs) to provide network status monitoring and diagnostics. A
web interface enables authorized personnel direct access to advanced diagnostics using a common web browser. The
DM31 transponder is composed of the following:
Fig. 1, DM31 Transponder
LED Indicators
ALM/RDY DM31 ready, major/minor alarm DS Downstream RF carrier detection/lock
Rx/Tx PWR RF power level US Upstream RF carrier detection/lock
COM XM3 communications OL Registration lock
PWR DM31 power LNK Ethernet link
Ethernet Port
Thumbscrew
Thumbscrew
Environmental Port
Tamper Switch Connector
RF Connector
Required
Grounded Surge Protector
(Alpha p/n 162-028-10 or equivalent)
To HeadendRF Drop
COM
PWR
DS
US
OL
LNK
RX/TX
PWR
GRN = OK
BLU = WARN
RED = OUT
R
S
T
R
F
E
N
V
E
T
H
TPR
ALMRDY
TORQUE
10.0 IN-LB
11.5 kgf.cm

2017-891-B12-001, Rev. A (02/2023)
Installation / Replacement Procedure
Before removing the Inverter Module, verify the power supply device address is set to a valid number. Power supplies
must have 1, 2, 3, 4 or 5 as an address (not 0).
• To verify the power supply’s address, go to the LCD Smart Display on the inverter module and enter the
PWR CNFG menu.
• Scroll to the DEVICE ADDRESS menu item and verify the device address is set to something other than 0 (zero).
Removing the Inverter Module:
1. Turn off the battery breaker.
2. Disconnect the battery input and temperature sensor cables from the inverter module, followed by the tamper and RF
if a transponder is currently installed.
3. Loosen the thumbscrew on the XM3™ power supply inverter module and the thumbscrew on the transponder (if
applicable).
4. Grasp the handle on the bottom right side of the inverter module. Pull firmly to release the module from the inverter
connector. Gently slide the module assembly straight out until the inverter module is accessible.
5. If applicable, remove the
old transponder from the
inverter module.
6. The white stand-off on the
side of the inverter module
should be snipped off to
avoid interference with
the DM31 transponder
assembly (Fig. 2). Use wire
cutters to snip the stand-
off.
Fig. 2, Modifying Stand-off
For XM3™ power supplies in service, backup battery power will not be available during this
procedure.
NOTICE:
Service personnel must verify the inverter module battery breaker remains in the OFF position
until instructed to return the unit to service.
CAUTION!
Before clipped off
After clipped off
18-Pin Connector
Stand-off
Piece
To ease the installation
process, remove
the ribbon from the
transponder and
connect to the inverter.
Clip stand-off
Industry standard board replacement procedures should be followed. To reduce static, Alpha®
recommends the use of a static reducing wrist strap.
NOTICE:

3017-891-B12-001, Rev. A (02/2023)
7. Center and angle the latch
bracket tabs of the transponder
and insert them in the slots
as shown in Fig. 3. Lower the
transponder down so it's flush
with the bracket. Ensure the
PCBA slot is centered with the
18-pin connector (Fig. 4).
Fig. 3, Rear Bracket Connection
Fig. 5, Ribbon Cable Installation Fig. 6, RF Cable Installation
Fig. 4, Captive Screws
8. Fasten the transponder to the
Inverter Module by tightening
the two captive screws
(Fig. 4). It is recommended
that the screws be tightened
alternately, a few turns at a time,
so the transponder aligns in
parallel to the Inverter Module.
9. Install the 18-pin ribbon cable between the DM31 transponder and the inverter module (Fig. 5).
10. Reinstall the Inverter Module, tighten the two thumbscrews and reconnect the front panel connections (tamper,
temperature sensor, battery harness, etc.).
11. Verify the recording of the cable modem MAC address (RF MAC) by navigating to the XM3™ power supply Smart
Display’s COMM menu.
12. Connect the RF drop as shown in Fig. 6. The DOCSIS®specification for downstream power level is ±15 dBmV.
However, for optimal performance, set the level as close to 0 dBmV as possible. RF attenuators may be required to
obtain optimal downstream (receive) RF levels.
Required
Grounded Surge Protector
(Alpha p/n 162-028-10 or equivalent)
To HeadendRF Drop
COM
PWR
DS
US
OL
LNK
RX/TX
PWR
GRN = OK
BLU = WARN
RED = OUT
R
S
T
R
F
E
N
V
E
T
H
TPR
ALMRDY
TORQUE
10.0 IN-LB
11.5 kgf.cm RF Drop To Headend
Required
Ground Surge Protector
(Alpha p/n 162-028-10 or equivalent)
18-Pin
connector
Captive
screw
Captive
screw

4017-891-B12-001, Rev. A (02/2023)
Initial Power-Up and Test / Return Unit to Service
1. Plug the power supply into the AC outlet.
2. Switch battery breaker ON.
3. The transponder LED indicators will all blink in unison upon initial power up. The RDY indicator will then begin blinking
steadily indicating normal processor activity.
4. Verify the DS and OL indicators are on solid. This verifies the Communications Module has registered an IP address
on the network.
5. Verify the RF indicator is solid green, indicating Upstream and Downstream Power is within the default specified
range and the Upstream RF Power is below the recommended +50 dBmV (Table 1).
6. Verify no XM3™ power supply alarms are active.
Verify Communications
XM3 Power Supply Smart Display - COMM Menu
Verify the DM3.1 Series transponder communication parameters such as IP address, RF Power Levels and Signal/Noise
Ratio on the COMM menu of the XM3 power supply Smart Display. Press ENTR to open the COMM-GENERAL menu
enabling the operator to view values for communications parameters. Pressing the up or down arrow softkeys will show
two lines of information for each submenu item (Fig. 7).
Table 1, RF Power Default Values
RF Power Default Values
LED Color Rx Range (dBmV) Tx Range (dBmV)
Green +10 to -10 0 to +50
Blue +15 to +10 and -10 to -15 +50 to +55
Red >+15 and <-15 >+55
Fig. 7, COMM Status/Menu
COMMS STATUS/MENU
CM MAC ADDRESS
00:90:EA:A0:04:99
CM IP ADDRESS
192.168.1.121
CM IPV6 ADR PREFIX
2001:123:456:789
CM IPV6 ADR POSTFIX
111:222:333:3434
CPE MAC ADDRESS
00:90:EA:00:52:33

017-891-B12-001, Rev. A (02/2023)
Alpha Technologies Services, Inc. | 3767 Alpha Way, Bellingham, WA 98226, USA
Tel.: Toll Free North America: [phone] | Outside US: [phone] | Technical Support: [phone]
For more information visit www.alpha.com
© 2023 Alpha Technologies Services, Inc., an EnerSys company. All Rights Reserved. Trademarks and logos are
the property of EnerSys and its afliates except DOCSIS®, which is not the property of EnerSys.
Subject to revisions without prior notice. E.&O.E.
Local Web Server Access:
The connection may be tested by using a computer and a standard Ethernet cable. Connect the computer to the Ethernet
port on the transponder, launch a web browser (e.g. Chrome) and enter 192.168.100.1 in the address field. The "Overview"
page, as shown below, will appear and display connectivity, power levels and power supply status information such as
alarms, output voltage, output current and individual battery voltages. System Name, System Location, System Contact
and Common Logical ID may be edited on this page; when prompted for a User Name and Password, use “Alpha” and
“AlphaGet”.
Remote Web Server Access:
Connect the computer to the cable modem network, launch an web browser (e.g. Chrome) and enter the designated
transponder IP address in the address field. The "Overview" page will appear (Fig. 8).
Fig. 8, Remote Server Web Page - Overview