DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-891H-ADAPTR (MSS Host Adapter)
9
H-ADAPTR (MSS Host Adapter)
The Host Adapter circuit is located on the UN332 Mass Storage System/Networ k
Control circuit pack (MSSNET) and is part of the Mass Storage System (MSS)
which also contains the Switch Control (SW-CTL) circuit. The MSS provides
non-volatile tape and disk s torage for booting the PBX system and for savi ng
system translation data.
The Host Adapter circuit p rovides the interface b etween the Switch Processing
Elemen t (SPE) sy stem b us an d th e Small Comp uter Sy stem Inter face (SCSI) b us.
The SCSI bus is an industry standard bus that connects a tape drive and disk
drive to the PBX.
Note that the red LED on the MSSNET board is shared by both the switch c ontrol
and host adapter c ircuits. A failure of either circuit wil l cause the LED to light. A
reset of the host adapter also causes this LED to lig ht. A separate MO (SW-CTL)
and its associated tests a re used for maintenance of the switc h control circuit.
The tape and disk drives are treated as separate, but related , maintenance
objects (TAPE and DISK). Problems with the host adapter may affect the
operation of the tape and d isk circuit pac ks.
When the host adapter is taken out of service b ecause of a failure of a critic al
host adapter test, or by us e of the busyout command, the TAPE and DISK
maintenance objects are also placed in an out-of-servic e state.
In a sy stem w ith d upl icat ed SPEs, the t ests r un on t he st andb y hos t ad apte r
circuit are identical to tho se run on the active host adapter circuit. The DUPINT
circuit pack hand les communications b etween the active and stand by SPEs for
both the control channel and memory shadowing. Therefore, prob lems with the
DUPINT circuit pack may affect maintenanc e tests of the standby host ad apter
circuit pack.

Circuit Pack Replacement Procedures

If the MSSNET circuit pack needs to be replac ed:
1. If the SPE is not dup lic ated :
MO Name (in
Alarm Log) Alarm Level Initial Command to Run1
1. In a system with a simplex SPE, the carrier need not be specified. In a system with duplicated
SPE s, carrier a or b must be speci f ied.
Full Name of MO
H-ADAPTR MINOR test host-adapter a|b long MSS Host Adap ter
H-ADAPTR WARNING test host-adapter a|b long MSS Host Adap ter