The following is our best approximation of the transition that Cisco has gone
through to create the AS5200. As you can see the architecture has not really
changed, it has just been repackaged. And of course in the AS5200 you are
still left with the digital to analog conversion and a possible bottleneck
at the async port. The diagram at the bottom shows the PM-3 architecture
in contrast.
Cisco Phase 1:
25XX plus external modems
+-----------------------------------+
| Cisco 25XX |
+-------+ | +------+ +----------------+ |
-- analog--| Modem |--- async ----| UART |-----| Routing Engine | |
+-------+ | +------+ +----------------+ |
| |
+-----------------------------------+
Cisco Phase 2:
AS5100
+--------------------------------------------------------------+
| US Robotics DWAN Hub |
| |
| +-----------------------------------+ |
| | Cisco 25XX on a card | |
| +-------+ | +------+ +----------------+ | |
-- T1 -----| Modem |--- async ----| UART |-----| Routing Engine | | |
| +-------+ | +------+ +----------------+ | |
| | | |
| +-----------------------------------+ |
| |
+--------------------------------------------------------------+
Cisco Phase 3:
AS5200
+---------------------------------------------------------------------+
| AS5200 Chassis |
| |
| +----------------------+
| +------------+ +----------+ | |
| | Digital | | Microcom | | +------+ +---------+|
- PRI ---| to |--analog--| Modem |--async ---| UART |--| Routing ||
| | Analog | | | | +------+ +---------+|
| | Conversion | +----------+ | |
| +------------+ +----------------------+
| |
| |
+---------------------------------------------------------------------+
Livingston PM-3 Architecture
+---------------------------------------------------------------------+
| PM-3 Chassis |
| |
| +-------+ |
|+---------+ +--------+ | High | +-----------------+ |
|| Digital | | Digital|---| Speed |---| Routing | |
- PRI --| Switch |--digital--| Modem |---| Back |---| Engine | |
|+---------+ +--------+ | Plane | +-----------------+ |
| +-------+ |
| |
+---------------------------------------------------------------------+
-MZ
-- Livingston Enterprises - Chair, Department of Interstitial Affairs Phone: 800-458-9966 510-737-2100 FAX: 510-737-2110 megazone@livingston.com For support requests: support@livingston.com <http://www.livingston.com/> Snail mail: 4464 Willow Road, Pleasanton, CA 94588