Cisco Cisco Unified MeetingPlace Audio Server Installation Guide
Cisco MeetingServer 5.1 Installation Planning Guide
49
Cisco Systems
March 2003
Action
Description
9
9
9
9
Access
Signaling
E&M Wink Start (default configuration)
8
Ground Start from local Telco service
E&M Wink Start, DTMF digits, and DID/DDI
Clear Channel
Loop start (OPS)
Coding
Format
B8ZS (strongly recommended), or
Jammed Bit (bit stuffing), or
AMI
9
Framing
Extended super frame (ESF)
10
(strongly
recommended), or
Standard super frame D4 (SF/D4)
Additional
Hardware
Channel service unit (CSU) required for each digital
T1connection over 100 meters (330 feet), or from PSTN
T1connection over 100 meters (330 feet), or from PSTN
8.
Modem
Requirements
Requirements
Analog telephone line, or PBX connection
Pilot number, accessible from outside
RJ-11C connector
9.
Translation Table
Translation table requirements for dialing restrictions
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)
•
PBX specific hardware or software (Smart Blades, software upgrade)
•
Additional hardware (CSU, UPS)
8
MeetingPlace only supports line-side loop-start and Ground Start CAS protocols, but supports both line-side and
trunk-side Wink Start CAS protocols.
9
If AMI is used, the number of zeros 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 could be sent to all channels at the
same time, exceeding the zero’s 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.
same time, exceeding the zero’s 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.
10
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, Latitude recommends configuring T1 spans for ESF framing.
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, Latitude recommends configuring T1 spans for ESF framing.