DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-637DS1-FAC (DS1 Facility)
9
#949 effects 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 9-27
.
Figure 9-27. DS1 CONV Complex and the DS1 Facilities
The DS1 CONV Complex can replace fiber links between two EIs and fiber links
between an EPN EI and an SNI. Fiber links between two SNIs and fiber links
between the Processor Port Network (PPN) 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.
The primary facility on the TN1654 DS1 CONV circuit pack is restricted to facility
A or facility B. The TN1654 provides fixed packet bandwidth of 192 Kbps while
the TN574 provides packet bandwidth of up to 1408 Kbps with a dynamic
allocation mechanism that could change packet/circuit use of individual
channels. The first three 64 Kbps channels on the primary facility of the TN1654
are reserved as the packet channels. The DS1 Control Channel will be Channel
24 in T1 mode and Channel 31 in E1 mode. In T1 format the TN1654 provides 24
circuit channels for use on non-primary facilities and 20 circuit channels on the
primary facility. E1 format provides 31 circuit channels for use on non-primary
facilities and 27 circuit channels on the primary facility.
Metallic or Fiber Connection
DS1CONV
DS1 Facilities
Network
EI
or
SNI
EI
DS1CONV
Metallic or Fiber Connection
