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Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter
Service Module Back Cards
Service Module Back Cards
The available MGX 8220 back cards are as follows.
T1 Backcards
The MGX 8220 shelf provides back cards for service modules that connect to 4 T1, 4 E1, 8 T1, and 8
E1 lines. Depending upon the number of ports and the type of line (T1 or E1) DB-15, BNC, RJ-48, and
SMB connectors are used. The possible back cards (see Figure 4-16) are
• DB15-4T1-BC
• DB15-4E1-BC
• BNC-4E1-BC
• RJ48-T1-BC
• RJ48-E1-BC
• SMB-E1-BC
The back cards provide the physical line connections to either the T1 or E1 lines and communicate with
their front cards through the MGX 8220 backplane. A front card/back card set must always be installed
in the same slot position.
X.21 Back Cards
The FRSM-HS1 uses a back card that supports 4 X.21 ports using DB-15 connectors. Each port can
support up to 4 Mbps.
DB15-4X.21-BC
The X.21 Physical interface specifies a DB-15 female connector (DCE type according to ISO 4903.)
Pin functions can be controlled in software to change from DCE to DTE. A converter cable can be used
to convert X.21 to V.35, if necessary.
Table 4-6 lists the supported line speeds for the FRSM-HS1.
Table 4-6 Configurable Line Speeds in bits per second
48000 56000 64000 112000 128000
168000 192000 224000 256000 280000
320000 336000 384000 392000 448000
512000 768000 1024000 1536000 1544000
1792000 1920000 1984000 2048000 3097000
3157000 4096000