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 soft ware error log by forcing the firmware to report
the pending errors ag ain.
DS1 CONV circuit packs are connec ted to the Expansion Interface (EI) circ uit
packs (TN570) and the Switch Node Interface (SNI) circuit pac ks (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 b etween 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 p acket facility), and it i s the only facility that can c arry
packet traffic b esides providing circuit connec tions. The primary facility has 2 2
channels available for circ uit and packet connections. Other fac ilities each have
24 channels available for c ircuit connections. On the TN574 p rimary facility,
channels 1and 24 are not availab le for packet or for ci rcuit connections. Channel
1 is used for excess pac kets traffic to prevent pac ket 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 p acks.
The primary facility on the TN1654 DS1 CONV circuit pac k is restricted to facility
A or facility B. The TN1654 provides fixed p acket bandwid th of 192 Kbps while
the TN574 provides packet b andwidth of up to 1408 K bps with a dynamic
allocation mechanism that c ould change p acket/circuit use of ind ividual
channels. The first three 64 Kbps c hannels on the primary facility of t he TN1654
are reserved as the packet c hannels. 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 no n-primary facilities and 20 circuit channels on the
primary facility. E1 format provides 31 c ircuit channels for use on non-p rimary
facilities and 27 circ uit channels on the primary f acility.
Metallic or Fiber Connection
DS1CONV
DS1 Facilities
Network
EI or
SNI
EI
DS1CONV
Metallic or Fiber Connection