Verilink HDM 2182 (880-502925-001) Product Manual Instrukcja Użytkownika Pobierz pdf (Strona 11)

HDM 2182 DS3 DSU Overview

Verilink HDM 2182 User Manual 1-3

Inband

Management

Channel

Specialized support is provided for the inband management

channel in C-bit parity applications. The three C-bits in M-subframe

5 of the DS3 frame are assigned as a 28.2 kbit/s terminal-to-

terminal path maintenance data link. The signal format used on

this data link consists of messages using the Link Access Procedure

on the D-channel (LAPD) protocol. A dedicated HDLC controller is

built into the hardware for this 28.2 kbit/s LAPD data link. The

controller supports polled, interrupt-driven operation.

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 2182

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 2182 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 2182 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 2182 modules within

or cross-shelf from a single NCM source.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 80 81

Komentarze do niniejszej Instrukcji

Brak uwag

Verilink HDM 2182 (880-502925-001) Product Manual Instrukcja Użytkownika Strona 11

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Sprzęt komputerowy Verilink HDM 2182 (880-502925-001) Product Manual