Cisco Cisco Unified MeetingPlace Audio Server 설치 가이드
Telephony and LAN planning 3-41
February 27, 2004
Cisco MeetingPlace Audio Server Installation Planning Guide
WARNING
The following telephony components or services can take from
4 to 6 weeks to order and install:
•
Network Telco Service (trunk lines, main phone number, or combined
access numbers)
access numbers)
•
PBX specific hardware or software (Smart Blades, software upgrade)
•
Additional hardware (CSU, UPS)
• Coding format
One of the following:
• B8ZS (preferred)
• Jammed Bit (bit stuffing)
• AMI
N
OTE
If AMI is used, the number of zeros (0) in a row may
exceed the recommended Telco value of 15. This can happen
if all participants in the same meeting are on the same span. In
that case, a 0s pattern can be sent to all channels at the same
time, exceeding the maximum. This, in turn, can lead to
meeting participants being dropped by the Telco from the
meeting. Therefore, use B8ZS or Jammed Bit, if possible.
if all participants in the same meeting are on the same span. In
that case, a 0s pattern can be sent to all channels at the same
time, exceeding the maximum. This, in turn, can lead to
meeting participants being dropped by the Telco from the
meeting. Therefore, use B8ZS or Jammed Bit, if possible.
• Framing
One of the following:
• Extended super frame (ESF) (preferred)
• Standard super frame D4 (SF/D4)
N
OTE
T1 facilities using D4 framing are susceptible to false
triggering of “yellow alarm” signals. This false triggering can
lead to dropped calls. Conferencing applications are
particularly susceptible to this problem with D4 framing. The
problem can occur when all 24 channels on a single span are
in a conference and are carrying identical data streams. D4
transmission equipment in the network can falsely interpret
the identical data on all 24 channels as a “yellow alarm”
signal. For this reason, Cisco recommends configuring T1
spans for ESF framing.
lead to dropped calls. Conferencing applications are
particularly susceptible to this problem with D4 framing. The
problem can occur when all 24 channels on a single span are
in a conference and are carrying identical data streams. D4
transmission equipment in the network can falsely interpret
the identical data on all 24 channels as a “yellow alarm”
signal. For this reason, Cisco recommends configuring T1
spans for ESF framing.
• Additional hardware
Channel service unit (CSU) required for each T1 connection over
100 meters (330 feet) from Denmark; or from PSTN.
100 meters (330 feet) from Denmark; or from PSTN.
8. Modem requirements
• Analog telephone line, or PBX connection
• Pilot number, accessible from outside
• RJ-11C connector
9. Translation table
Translation table requirements for dialing restrictions.
Action
Description