The D1M-1A1004 is a 56-termination DSX-1 front below cross-connect panel with bantam jacks.

Attributes
Color: Black
Dimensions (HxWxD): 4.98" x 23" x 6.11"
Mounting: 2", 4", or 5" recess in a 23" (58.2 cm) rack, using WECO/EIA mounting brackets
Terminations: 56
Designation: 1-28 AB Grouped
LEDs: Orange
Jack Type: Bantam
Cross-Connects: Wire Wrap / Front Below
IN/OUT Connections: Wire Wrap / Rear
Cable Management: (4) 4" x 4" Vertical Jumper Rings; (1) Rear Horizontal Cable Bar; IN/OUT Terminal Block Shield
Impedance: 120 Ohms
Voltage: -48 vDC

Some key features and benefits of the D1M-1A1004 are:
Die-cast Bantam jacks are rigorously tested with over 10,000 insertions/withdrawals
Superior cable management designed into each panel
LEDs flash at both ends of the monitored circuit for 30 seconds
Cross-connections are located below the jacks on the front of the panel
Guarantees reliability, durability, and quality over time
Simplifies cable routing and circuit identification for growing and changing networks
Quick identification of cross-connected circuits
Integrated horizontal cable trough enables cable management along the panel