Verilink HDM 2180 (880-503048-001) Product Manual - Manual (Page 13)

HDM 2180 DS3 DSU Overview
Verilink HDM 2180 User Manual 1-3
Far-End Alarm
and Control
Dedicated support is provided for Far End Alarm and Control
(FEAC) signals in C-bit parity applications. The third C-bit in M-
subframe 1 of the DS3 frame provides the FEAC signal. A bit-
oriented message protocol (16 bit length) is used on the FEAC data
stream.
Downloadable
Upgrades
As a member of the AS2000 product family, the HDM 2180
incorporates Verilink’s Advanced Programmable Architecture
(APA).
With APA, you can download upgraded firmware to all HDM
modules on your shelves from a single NCM source into the
modules’ onboard RAM via FTP. The firmware contained in the
flash can also be field-replaced with upgraded chips.
Compatibility
with Other
Verilink Products
The HDM 2180 can reside on the same shelf with all other AS2000
products; however, it does not pass data on the midplane and does
not use the TABS bus of the shelf midplane. The HDM 2180 is a
standalone system that can also be managed through the ACP bus
of the shelf midplane by an NCM 2000 module. Advantages of using
the NCM module include:
• Higher security on the network with four levels of access using
password control (instead of only one access password).
• Verilink’s proprietary overhead bandwidth signalling that
enables you to configure and troubleshoot the far-end node
without interference from repeaters in the network. (This
overhead bandwidth requires the C-bit parity format.)
• Up to three users can access the module at a time.
• Using the Advanced Programmable Architecture (APA) to
download upgrade firmware to all HDM 2180 modules within
or cross-shelf from a single NCM source.
• The HDM can be managed with a graphical user interface (GUI)
using Verilink’s Node Manager software application.
Technical Description
The HDM 2180 consists of two components:
• A front-panel module, which contains the DSU microprocessor
including firmware in flash, and
• A detachable rear-panel connector interface module (CDM
2180), which contains a high-speed serial interface (HSSI) data
port and 75
Ω coaxial transmit and receive network connectors
for the DS3 network interface.