Circuit Emulation VLL (Cpipe) Services
Page 148 7705 SAR OS Services Guide
Circuit Emulation Parameters and Options
All ports on a 16-port T1/E1 ASAP Adapter card and 2-port OC3/STM1 Channelized
Adapter card can be configured independently to support TDM circuit emulation across the
packet network. Structure-aware mode (CESoPSN) is supported for n × 64 kb/s channel
groups in DS1 and E1 circuits. Unstructured mode (SAToP) is supported for full DS1 and
E1 circuits. The following parameters and options are described in this section:
• Unstructured
• Structured DS1/E1 CES without CAS
• Structured T1/E1 CES with CAS
• Packet Payload Size
• Jitter Buffer
• RTP Header
• Control Word
Unstructured
Unstructured CES is configured by choosing satop-t1 or satop-e1 as the
vc-type when creating a Cpipe service. For DS1 and E1 unstructured circuit emulation, the
framing parameter of the port must be set to
ds1-unframed and e1-unframed
(respectively) because SAToP service ignores the underlying framing. Additionally, channel
group 1 must contain all 24 or 32 timeslots, which is configured automatically when channel
group 1 is created.
For DS1 and E1 circuit emulation, the payload packet size is configurable and must be an
integer value between 64 and 1514 octets and must be a multiple of 32. The payload packet
size affects the packet efficiency and packetization delay. Table 18 shows the default values
for packet size and packetization delay. See Packet Payload Size on page 154 for more
information.
Note: When using SAToP to transport DS1 traffic, the framing bit (bit 193) in the DS1
overhead is included and packed in the payload and sent over the PSN. If the underlying
framing is ESF, then the Facility Data Link (FDL) channel is transported over the Cpipe as
part of the SAToP service. No matter the case, the framing parameter of the port must be set
to unframed.
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