PM8621 PMC-Sierra, Inc., PM8621 Datasheet - Page 139

• Manufacturer Part Number: PM8621
• Description: NSE-8G Standard Product Data Sheet Preliminary
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010850, Issue 1
The SBS and NSE-8G devices have two configuration pages controlling the switching of each
DS0 with CAS. The SBS has independent configuration pages for each direction of data flow
through the device. The NSE-8G has one set of configuration pages. System configuration
changes are made by writing to the offline configuration page in all affected devices and then
swapping from the old configuration page to the new configuration page. The TCMP and OCMP
signals control the current configuration page of the SBS and the CMP signal controls the current
configuration page of the NSE. Swapping of configuration pages must be aligned to frame
switching through the system to avoid any possible data corruption. The TCMP, OCMP and CMP
signals are sampled with the SBS IC1FP and RC1FP signals and the NSE-8G RC1FP signals
respectively. The CMP signals can be connected together at the expense of having to ensure all
device configuration pages are current.
Figure 19 shows how the devices are connected together. The following timing diagrams show
the external signals and the internal device frame alignment signal generated from the
programmed delays. Although the CMP signals are sampled externally with the C1FP signals they
are also delayed internally to coincide with the internally delayed frame signals. These are also
shown in the timing diagram. All internal signals are identified by the .INT suffix.
Figure 19 TEMUX-84™/SBS/NSE/SBS/AAL1gator-32™ system DS0 Switching with CAS
SBS #1 OCMP
SBS #1 TCMP
SBS#2 OCMP
SBS#2 TCMP
NSE CMP
C1FP
TEMUX84
DC1FP
AC1FP
SBI336
IC1FP
OC1FP
RC1FP OCMP
SBS #1
TCMP
SBI336S
RC1FP
NSE-8G™ Standard Product Data Sheet
NSE
CMP
SBI336S
RC1FP
IC1FP
SBS #2
OCMP
OC1FP
TCMP
Preliminary
SBI
AALIGATOR32
138
DC1FP
AC1FP