Zhone Technologies IMACS Network Device - Manual (Page 15)

Zhone Technologies, Inc. IMACS Product Book, Version 4
March 2001 Page 11
T1
Concentrator Node
Terminal
Server
FDL over ESF
38.4 kbps SLIP
Each FDL is mapped
to a separate DS0
DACS
NMS
IMACS IMACS IMACS
IMACS
Figure 5 - IMACS Management Using FDL
The management DS0s are connected internally to the B7R card with a limit of eight management DS0s per card.
The output of the B7R card is RS-232 at up to 38.4 Kbps using SLIP. This output is fed into a terminal server or a
router and transported to a NMS. Alternatively, the SLIP Async stream can be connected directly into a locally
attached NMS if a port is available. Furthermore, the MCC server card supports up to 128 remote connections.
IMACS Management Using B7R encoded DS0 (TS 24 for T1 and TS 31 for E1)
A third method is to carry IP traffic in a DS1’s time slot 24 or E1’s time slot 31. This method requires that each
time slot 24/31 from multiple remote nodes are groomed in the network into a single T1, and are transported to an
IMACS equipped with a B7R or MCC card so that IP data can be extracted.
A B7R card or a MCC card is used in the IMACS at the central site to accept and decode SNMP network
management information from up to eight remote IMACS (via separate DS0s) (128 for MCC). The IMACS at the
remote sites can place SNMP traps and other IP traffic in a B7R encoded DS0 (time slot 24/31). A B7R card is not
required at the remote sites. At the central site a B7R/MCC card is required only if the B7R / DS0 transport
mechanism is utilized.
The TCP/IP option must be available to support the B7R function. If the SNMP traps and associated TELNET
sessions are carried in a B7R encoded DS-0 from the originating IMACS (instead of within the FDL), a DACS II is
not required. In this case the NMS data from the originating IMACS is formatted by the remote IMACS’s CPU in
the same B7R format as would have been generated by the DACS II if the FDL scheme was used. In either case, a
B7R or MCC card is required at the NMS concentrator site. The B7R card is a User card, therefore up to eight B7R
cards may reside in an IMACS node, supporting eight DS0s each, for a total of 64 remote sites per IMACS. The
MCC card is a server card, supporting up to 128 remote IMACS nodes. A total of 3 MCC cards are supported per
concentrator node.