Carrier Access Network Device Axxius 800 - Manual (Page 482)

17-2 Axxius 800 - Release 2.2
Low Speed Protection Card
Overview
Overview
Low speed protection provides backup circuitry for any T1 service port on a Quad T1
service card or Quad DS1 ADPCM service card in the Axxius chassis. The Relay card
provides the physical connectivity between the “Protected” T1 service port and the
“Backup” T1 service port. Connectivity exists between the Service card and the Relay
card via the backplane pins only.
The service card slot that is configured for the “Backup card” is specified using CLI
commands. Additionally, the commands enable the user to specify what service card
(T1 or DS1 ADPCM) is to be protected and which port(s) on that card are to be
protected. In this manner, the protection card provides protection on an individual port
basis as opposed to a per card basis. Therefore protection is available for multiple cards
at the same time, as long as the port needing protection is not already being used by the
Backup card. For example if a Quad T1 card, slot 1, port 1 requires protection, the
Backup card port 1 is used to provide that protection. Ports 2-4 are still available for
protection on the remaining protected service cards.
A protected system can contain both T1 and DS1 ADPCM service cards. However, the
ADPCM mapping must be set the same on all cards in the protected system for Port #1
to be protected. Note: ports 2-4 are not effected by the ADPCM feature configuration.
See the following chart:
BACKUP CARD
PROTECTED CARD
T1 Service
Card
DS1 ADPCM Card
(ADPCM set to
"none")
DS1 ADPCM Card
(ADPCM set to "map1",
"map2" or "map3")
T1 Service Card supported supported not supported
DS1 ADPCM Card
(ADPCM set to "none") supported supported not supported
DS1 ADPCM Card
(ADPCM set to "map1",
"map2" or "map3") not supported not supported supported