Maintenance-Object Repair Procedures
555-233-143
8-660 Issue 1 May 2002
Every error condition reported by the firmware is associated with the background
tests that the firmware runs autonomously. Demand tests that are executed by
the maintenance software do not have any functionality that would effect any
additional error manipulation by the firmware. However, the Failure Audit test
(#949) affects auditing of the software error log by forcing the firmware to report
the pending errors again.
DS1 CONV circuit packs are connected to the Expansion Interface (EI) circuit
packs (TN570) and the Switch Node Interface (SNI) circuit packs (TN573) as
shown in Figure 8-24.
Figure 8-24. DS1 CONV Complex and the DS1 Facilities
The DS1 CONV complex can replace fiber links between two EIs and fiber links
between an PN’s EI and an SNI. Fiber links between two SNIs and fiber links
between the IP Server Interface (IPSI) and the Center Stage Switch (CSS) cannot
be replaced by a DS1 CONV complex.
On the TN574 DS1 CONV circuit pack, one of the four DS1 facilities is used as the
primary facility (or packet facility), and it is the only facility that can carry packet
traffic besides providing circuit connections. The primary facility has 22 channels
available for circuit and packet connections. Other facilities each have 24
channels available for circuit connections. On the TN574 primary facility,
channels 1and 24 are not available for packet or for circuit connections. Channel
1 is used for excess packets traffic to prevent packet overflow that might result
from zero code substitutions. Channel 24 is the DS1 control channel that carries
control link data between the two DS1 CONV circuit packs.
Metallic or Fiber Connection
DS1CONV
DS1 Facilities
Network
EI
or
SNI
EI
DS1CONV
Metallic or Fiber Connection
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