Caution   Place the central control board on a flat surface before inserting the CMS subboard.   The spacing bolts supplied guarantee the correct insertion of the subboard, so you should always mount them (see Figure 3-7).   Otherwise you may damage the board.

Figure 3-8

Networking Options for HiPath 3000 Systems

Table 3-19

Recommendations for CMA and CMS Implementation

Trunk connection	Reference clock	HiPath Cordless Office			Trunk connection	Reference clock	HiPath Cordless Office
		no	yes				no	yes
Networking via ISDN S0 lines:
MASTER system					SLAVE system(s)
No trunk or analog trunk	-	-	CMS or CMA    (see Tabelle 11-1)		No trunk or analog trunk	Via ISDN S0 networking line	-	CMA2
ISDN S0   (not always active)	Via ISDN S0 trunk connection    (if active)	CMS1	CMS or CMA    (see Tabelle 11-1)		ISDN S0   (not always active)	Via ISDN S0 networking line	-	CMA2
ISDN S0   (always active)	Via ISDN S0 trunk connection	CMS1	CMA2		ISDN S0   (always active)	Via ISDN S0 trunk connection	-	CMA2
ISDN S2M	Via ISDN S2M trunk connection	CMS1	CMA2		ISDN S2M	Via ISDN S2M trunk connection	-	CMA2
Networking via ISDN S2M lines:
MASTER system					SLAVE system(s)
No trunk or analog trunk	-	-	CMS or CMA    (see Tabelle 11-1)		No trunk or analog trunk	Via ISDN S2M networking line	-	CMA2
ISDN S0   (not always active)	Via ISDN S0 trunk connection    (if active)	CMS1	CMS or CMA    (see Table 11-2)		ISDN S0   (not always active)	Via ISDN S2M networking line	-	CMA2
ISDN S0   (always active)	Via ISDN S0 trunk connection	CMS1	CMA2		ISDN S0   (always active)	Via ISDN S0 trunk connection	-	CMA2
ISDN S2M	Via ISDN S2M trunk connection	CMS1	CMA2		ISDN S2M	Via ISDN S2M trunk connection	-	CMA2
Networking via Ethernet/IP (10/100 BaseT) lines:
System 1					System(s) n+1
No trunk or analog trunk	-	CMS3	CMS or CMA    (see Tabelle 11-1)		No trunk or analog trunk	-	CMS3	CMS or CMA    (see Tabelle 11-1)
ISDN S0   (not always active)	Via ISDN S0 trunk connection    (if active)	CMS3	CMS or CMA    (see Tabelle 11-1)		ISDN S0   (not always active)	Via ISDN S0 trunk connection    (if active)	CMS3	CMS or CMA    (see Tabelle 11-1)
ISDN S0   (always active)	Via ISDN S0 trunk connection	-	CMA2		ISDN S0   (always active)	Via ISDN S0 trunk connection	-	CMA2
ISDN S2M	Via ISDN S2M trunk connection	-	CMA2		ISDN S2M	Via ISDN S2M trunk connection	-	CMA2

1CMS is not necessary if the reference clock supplied by the CO is always available via the networking lines (not a transparent clock). 2CMA is not necessary if ADPCM conversion is not needed for HiPath Cordless Office (see Tabelle 11-1). 3CMS is not necessary but is recommended for the following reasons: Although an Ethernet link is an asynchronous connection, 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.