DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1194PGATE-BD (Packet Gateway Circuit Pack)
9
PGATE-BD (Packet Gateway Circuit
Pack)

Packet Gateway Circuit Pack

The TN577 Packet Gateway is a packet port c ircuit pack that p rovides
connectivity between sync hronous communication links and Packet Bus
endpoints.
A LAPD s igna ling link i s esta blis hed b etwe en the Packe t Gate way an d th e SPE
for passing call c ontrol and other management i nformation. Since one link serves
all the ports on the circuit pack, maintenance of the sig naling link is part of the
Packet Gateway circuit pac k maintenance.
Three external cabling arrang ements allow port configur ations supporting four
RS423 connectors. External ports on Packet Gateways running the X.25
application p rovide switch connec tivity to BX.25 adjuncts : AUDIX, CMS, ISDN
Gateway, other PBXs in a DCS network, and 3B2 Message Server Adjuncts.

Packet Gateway Congestion Controls

Congestion controls are activated on Packet Gateway when the number of
buffers reach a spec ified threshold (high b uffer mark). The switch releases its
congestion controls when the Packe t Gateway reports that it has recovered from
congestion, i.e., its utilized buffer level has returned to normal levels.
A MINOR on-board alarm is raised if c ongestion persists on the affec ted Packet
Gateway for a 15 minute interval or is raised immedi ately if the congestion
controls fail to prevent all buffers from b eing exhausted. When cong estion
abates, the MINOR alarm is not retired until the Packet Gateway is free of
congestion for 30 minutes.
MO Name (in
Alarm Log) Alarm
Level Initial Command to Run1
1. UU is the universal cabine t number (1 for PPN, 2 - 44 for EPNs). C is the carrier desi gnation (A, B, C,
D, or E). SS is the number of the slot in which the circuit pack resides (01 to 21).
Full Name of MO
PGATE-BD MINOR test board UUCSS long Packet Gateway Circuit Pack
PGATE-BD WARNING test board UUCSS short Packet Gateway Circuit Pack