Alpha Technologies AlphaNet Series External DOCSIS - Manual (Page 12)

12 745-838-B2-001 Rev. A
2.1.6 Confi rming the RF Drop
An RF drop is required at the power supply site. The RF drop should not have •
plant voltage.
The transponder contains a DOCSIS 2.0 cable modem. The downstream level •
(DS) into the transponder should be between -15 and +15 dBmV, with a recom-
mended level of 0dBmV.
2.1.7 Provisioning Network Connectivity
The transponder’s cable modem must be recognized by the CMTS as a valid device,
obtain an IP address from the DHCP server, locate the TFTP and TOD servers, and
communicate with the SNMP management server (trap receiver). Different security
methods are used to insure network integrity, some common issues are:
A “subscriber account” (where the subscriber is the transponder) may be required •
for each transponder.
The transponder’s MAC address may have to be pre-loaded into the CMTS. •
MAC fi ltering may have to be modifi ed to allow MAC addresses starting with •
00:03:08xx:xx:xx to be registered.
For SNMP access, UDP ports 161 & 162 must not be blocked. •
Firewalls must allow communication between the cable modem and the various •
servers noted above.
If the address of the TFTP and/or TOD server is different than the DHCP server, •
the response from the DHCP server must contain the TFTP and TOD addresses.
2.0 Installation, continued
2.1 General Installation Information for Supported Power Supplies, continued
2.1.5 Connecting the Power Supply Interface and Measurement Cables
Connect the power supply interface and measurement cables to the power •
supply. Connections are dependent on the type of power supply confi guration
you are using. See the section specifi c to your confi guration.
It is important to be able to measure the site input line voltage. If you are •
not using a USM2.5/XM2 power supply, then it is recommended you use a
transformer (110V and 220V available*) to sample the commercial power at
the site. While it does not power the transponder, it makes it possible for the
transponder to report the actual line voltage. An additional transformer is not
necessary when using a USM2.5/XM2 power supply.
Use a surge protector within the cabinet when you are using a transformer to •
measure line voltage. Most cabinets come equipped with a duplex outlet.
* 110V applications: CBL-PS-PWR-01-001, p/n 875-563-10
220V applications: CBL-PS-PWR-03-002, p/n 875-562-10
(3' cord with IEC C13 connector and 220V US NEMA 6-15 plug)
2.1.8 Confi guring MIBs
This step is not performed in the fi eld, but at the network end of the installation. •
There are two propriety MIBs (Management Information Base) from Networks •
needed to confi gure the XP-EDH-A2. Refer to Section 4.0, "Proprietary
Management Information Bases (MIBs)" for detailed information.