HCD-E1 Installation & Operation Manual Chapter 1 - Introduction
01/01/01 08:07 Functional Description 1-9
A basic management topology, which is suitable for both SNMP and Telnet
management, is shown in Figure 1-3. In this example, a network
management station is attached to an Ethernet LAN. A remote access LAN
extender, MBE/RAS/A, is located near the managed equipment (such as
HCD-E1, MEGAPLEX-2100(*), etc.), and its serial ports are connected via
cables to the CONTROL connectors of the equipment.
Serial Ports
Network
Management
Station
MBE/RAS/A
LAN
. . . .
To CONTROL
Connection of
Managed
Equipment
Figure 1-3 Basic Management Topology Using Network Management Station
HCD-E1 also includes an SNMP agent that enables SNMP management of
the HCD-E1, using the UDP-over-IP protocol. The SNMP agent can
communicate out-of-band and/or in-band, where each communication
mode can be separately enabled:
Out-of-band communication is performed via the serial ports of HCD-E1,
using the Serial Link Internet Protocol (SLIP). When using out-of-band
communication, it is necessary to disable the Autobaud function, and select
a specific data rate for the port data rate (9600 bps is recommended).
In-band communication is performed over HDSL lines (i.e., over the main
link), and when applicable, over the sublink as well. This communication
mode uses a proprietary protocol. The user can configure the system to
transfer the in-band management traffic either by means of the E1 time slot
0 (sublink), or in a dedicated user-selected time slot (main link or sublink).
Using in-band management, a user of an SNMP management station
connected to one HCD-E1 can also control the HCD-E1 unit located to the
remote end of the main link, or the sublink.
The in-band management data rate depends on the selected routing
method:
• When using the TS 0 of the sublink, the data rate is 4 kbps.
• When using a dedicated main link slot, the data rate is 64 kbps.
• When using a dedicated sublink slot, the data rate is 8 kbps.
The HCD-E1 SNMP agent must be enabled by the user, so that it will accept
the management messages transmitted by the network management station.