Siemens HiPath 5000 Service Manual page 133

Table 3-21 Recommendations for CMA and CMS Utilization
Trunk Reference
connec- clock
tion
Networking via Ethernet/IP (10/100 BaseT) lines:
System 1
No trunk –
or analog
trunk
ISDN S Via
0
(not al- ISDN S
ways ac- trunk con-
tive) nection
(if active)
ISDN S Via
0
(always ISDN S
active) trunk con-
nection
ISDN Via
S ISDN S
2M
trunk con-
nection
1 CMS is not necessary if the reference clock supplied by the CO is always available via the networking lines (not a trans-
parent clock).
2 CMA is not necessary if ADPCM conversion is not needed for HiPath Cordless Office (see Table 11-1).
3 CMS is not necessary but is recommended for the following reasons: Although an Ethernet link is an asynchronous con-
nection, buffer overflow/underflow can cause transmission errors. To avoid this, the clock difference between the master
and the slave systems should be as small as possible so that the receive and send buffer can be read and addressed at
the same speed on both sides. The more accurate the clock source in the relevant systems, the fewer the faults.
P31003-H3560-S403-54-7620, 09/05
HiPath 3000 V6.0, HiPath 5000 V6.0, Provisional Service Manual
HiPath Cordless
Office
No Yes
3
CMS CMS or CMA
(see
Table 11-1)
3
CMS CMS or CMA
(see
0
Table 11-1)
– CMA
0
– CMA
2M
Trunk
connec-
tion
No trunk
or analog
trunk
ISDN S
0
(not al-
ways ac-
tive)
2
ISDN S
0
(always
active)
2
ISDN S
2M
Boards for HiPath 3000
Central Boards
Refer- HiPath Cordless
ence Office
clock
No
System(s) n+1
3
– CMS CMS or CMA
3
Via CMS CMS or CMA
ISDN S
0
trunk con-
nection
(if active)
Via –
ISDN S
0
trunk con-
nection
Via –
ISDN S
2M
trunk con-
nection
boards.fm
Yes
(see
Table 11-1)
(see
Table 11-1)
2
CMA
2
CMA
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