Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 193)

Configuration Options for 551VST Elements
Access Manager 2000 User Manual 5 -69
This option is defaulted to YES .
Note: Revision 2.2 or later of the 551VST List 2 firmware forces the
CRC options to be correct based on the framing format,
regardless of what the soft option switches are set to when the
CSU is powered up. This also applies to the 4016-R with
firmware revision 2.6 or later and 4016 List 2 with firmware
revision 2.3 or later.
CAUTION
The correct settings for the EQP and NET CRC regeneration options
in relation to the framing formats for the EQP and NET are critical to
the proper operation of the ESF CSU families, except for the 551VST
List 1/A. If the EQP is set for SF (D4) framing and the NET is set for
ESF framing, the NET CRC regeneration option must be set to
YE . I
the EQP is set for ESF and the NET is set for SF, the EQP CRC
regeneration must be set to
YE . For any other combination of
framing formats, the settings of the EQP and NET CRC regeneration
options are up to you. If these options are not set correctly for the
first two cases, constant CRC-6 errors result.
This option determines whether the framing format transmitted to the
network is ESF or SF (D4).
If SF framing is required on the network, set this option to NO (disable
ESF). The default setting is YES for ESF framing.
When the Enable YEL Transcode to Network option is
enabled ( YES ), it allows the CSU circuit element to detect an SF (D4)
yellow alarm on the EQP side and transcode it to ESF format on the
network.
If the EQP uses SF framing, the yellow alarm is B2=0 in all 24 channels.
If this alarm is detected for 400 +/- 1 milliseconds, it is transcoded to an
ESF yellow alarm on the ESF Data Link.
If the incoming signal from the EQP is ESF, the time for the CSU to
detect the yellow alarm and start transcoding it is 63 to 66 milliseconds.
!
Span Side ESF
Framing
Enable YEL
Transcode to Span