866
ISDN hardware
N0008589 3.3
Figure 221
T reference point
A T loop can be used in combination with an S loop to provide D-packet service for a point-of-sale
terminal adapter (POSTA) or other D-packet device. D-packet service is a 16 kbps data
transmission service that uses the D-channel of an ISDN line. The T and S loops must be on the
same physical module.
Clock Source for ISDN
Systems with ISDN interfaces need to synchronize clocking with the ISDN network and any ISDN
terminal equipment connected to the network. Systems synchronize clocking to the first
functionally available network connection. If there are excessive errors on the reference network
connection, the next available network connection is used for clock synchronization. The clock
synchronization process generates alarm codes and event messages. Clock synchronization is
supported by the DTM, BRI module, and FEM.
The Business Communications Manager derives timing from the network using T reference points
(loops). Terminal equipment on S reference points (loops) derive timing from the Business
Communications Manager system.
When you configure the network connections to the Business Communications Manager, you
should take into account the system preferences for selecting loops for synchronization:
•
lower numbered loops have preference over higher numbered loops
•
the loop preference order is: 201, 202, 203, 204 etc.
•
the system skips S and analog loops on Mod2 Card 1, when selecting a network connection for
synchronization
Systems with only S loops act as timing masters for the attached terminal equipment (TE), and are
not synchronized to the network. ISDN TE without access to a network connection (BRI lines) has
limited or no functionality.
If your system has both a BRI S/T configured as BRI, and a DTM configured as PRI, it is
recommended that you use PRI as the primary clock source. See
“PRI hardware” on page 864
.
network
connection
T
ISDN
Business Communications Manager
Содержание BCM 3.7
Страница 1: ...Part No N0008589 3 3 December 2006 Business Communications Manager 3 7 Programming Operations Guide...
Страница 4: ...4 Software licensing N0008589 3 3...
Страница 32: ...32 Contents N0008589 3 3 W 937 Index 939...
Страница 46: ...46 Tables N0008589 3 3...
Страница 64: ...64 How to get help N0008589 3 3...
Страница 90: ...90 Manually activating Telnet N0008589 3 3...
Страница 116: ...116 Delayed system restart N0008589 3 3...
Страница 194: ...194 Configuring a data module N0008589 3 3...
Страница 276: ...276 Setting line telco features N0008589 3 3...
Страница 310: ...310 Using COS passwords N0008589 3 3...
Страница 364: ...364 Enhanced 911 E911 configuration N0008589 3 3...
Страница 380: ...380 Renumbering DNs N0008589 3 3...
Страница 398: ...398 Saving wizard pages on your computer N0008589 3 3...
Страница 458: ...458 Voice Mail settings N0008589 3 3...
Страница 488: ...488 Setting system telco features N0008589 3 3...
Страница 508: ...508 Other programming that affects public networking N0008589 3 3...
Страница 522: ...522 PRI networking using Call by Call services N0008589 3 3...
Страница 592: ...592 Monitoring Hunt groups N0008589 3 3...
Страница 636: ...636 Configuring Double Density N0008589 3 3...
Страница 640: ...640 Using the Network Update Wizard N0008589 3 3...
Страница 666: ...666 Importing and Exporting DHCP data N0008589 3 3...
Страница 722: ...722 Restarting the router N0008589 3 3...
Страница 726: ...726 Important Web Cache considerations N0008589 3 3...
Страница 748: ...748 Configuring an Interface with NAT N0008589 3 3...
Страница 794: ...794 IPSec N0008589 3 3...
Страница 818: ...818 Configuring the Policy Agent characteristics N0008589 3 3...
Страница 832: ...832 Firewall rules for Business Communications Manager with Dialup interfaces N0008589 3 3...
Страница 876: ...876 ISDN Programming N0008589 3 3...
Страница 1004: ...1004 Index N0008589 3 3...