Cisco Cisco Unified MeetingPlace Audio Server Installation Guide

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)

• Coding format

One of the following:

• B8ZS  (preferred)

• Jammed Bit (bit stuffing)

• AMI

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.

• Framing

One of the following:

• Extended super frame (ESF) (preferred)

• Standard super frame D4 (SF/D4)

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.

• Additional hardware

Channel service unit (CSU) required for each T1 connection over 
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.